SCIENTIFIC ABSTRACT BELOV, K. P. - BELOV, K. P.

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• Publication Date: December 31, 1967
• Content Type: SCIENCEAB

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a"t of Elutle and Residua Deformatifta CA Ilia Ofiliguic Mect Of
Ferramutistic MAtuWs INicksl]. K. P. JJlor and D. 1. VOlkov IZANP.
),'iiki (J. Trek. physim), 1939. 9.'020'1539; Ck~m, ZtW., 1140,
-1132).--iln Russian-1 In plastic deformatiori, zonex of tenotle aim;
of compmeive stre"es in the metal can be "fulated, the magnitudr.
runtler. fird direction of which 4penil an the nature of the d-Jormation.
Mand V. amumea mo)PI oftlWnbutiontifirilerrial atrem" in a niikel %ire
uft--r r4tw~ti-, di-formation, in whi--h tensile d com WO alternate
wr."mllv it% the crove-wilon. Corr""Mirtg 1. Xe air',-. hrrchnits, the
7U.j:twti%%6iu vectors He pirallel anit vertical to the axia tof the wire. thia
rApUrth4; thr dren"k- of gAlv:inu=*gnrtic effect by iii drawn jockri
IMIMp" with annealeti soft nickcl. Galvamm~tric and P'twilar effertsma%
'Oet're irt'gencral'iss servitittlye indicators of the Inti-rual stn. distributiou U1
PL
rl,-~

1947
Mqp6tostrictloa
Invar
OTaVerature Dependence of the Magmetostriotion of
Mmiar Alloys," K. P. Belov, 0'. N. Agwyan, Sci Res
Lwt Pbys, Moscow State U, 6 pp
"1&V Akad Kauk SSSR, Ser Piz" Vol XI, No 6
i-q Invar, elinvar, kovar, and similar alloys have
anamalies of their volume and elastic properties
1:4 with very complex dependence upon temperature. Ao-
cording to present hypotheses, the nature of these
anocalies is clearly connected vith the ferromagnet-
Ion of these alloys, and prim ily determined by,
USBRAYhys. (Ccntd) Nov/Doe 1W
character af flov of the ferromagnetostriction
phenomena. This study ofim3goetootri6tion of these.,
alloys-and especially the depohdanob upoxi tem*pera-,-
ture is of Interest'since It makes poe6ible derter'-,
wination of the nature of the anomalous propertis
of Invar-type alloys.

X.~W/DW4'~. 194T
Invar
"Verrmagnetic Nature of Properties of Inver end
IlInvar Alloys," K. P. Belov, Sci Res Inst Pbyso,'.'~'
Mucow State U, 41 pp
llzv Akad Nauk SSEM, Ser Piz" Vol II, No 6
On the basis of results of this study rational ex-
p2anation is given of the anomaly of thermal expan-
elan la Inver allcys and of the low temperature oo-
efficient of the modulus of'slewtialty of ellnrar~'
Using data obtained by mewurement of magmetostrie-
tion and susceptibility In the paraprocess f ield,
'Taftrwootne" of -'t" Iferrawalotlow CM1 anation ar,
ii 46111~~
-~49'lthwuel expensibn an ThVex is 'shoiin'
i4ft

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Gives dettills of method using a cathode-ray owil-
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I K. P.
SlIzade, Z. 1. and "The effect of elasticity (tension)
on the magnetic induction of the Fe-Pt alloy-.," Vestnik Moak. un-ta,
19-48, No. 9,-p.- 47-49
SO: U-2388, Letopis Zhurnallnykh 9tatey, No. 1, 1949

Belov, K. P. Experimental demonstrations of the' ferrowagnetic nature of
anomalies in the thermal expansion of Invar stebls," (Paper
read at the Lomonsov readings in the Physics Faculty of
Moscow University, April 1948), Vestnik Hosk. un-ta, 1948,
No. 11, p. 89-94 --- Bibliog: p. 94
So: U-3566, 15 March 53t (Letopis IZhurnal Inykh Statey, No. 13p 1949)

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0 94 Nation of Nk-ILVI (3aaa to tho Cark Point. In Rus-
11. IWO. 7ijunwi rekhakhokof F111 Onto-,
219m
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nal of Tedink-al Fhyskg). V. 10. June 1049, P. 001.0ft
.46 Shm cpenmentallY " CISAdc teRMIC st- IOU.
llue of spontancous niagnetizatinn of nkkel
cam tlw V,
09#3 OW is espacififly significant In tha rcgkjn of the Curie

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538.221 : 538.652 370
The Magnetostriction of Fe/Pt Alloys. - N,S. Akulov, Z.I. Alinade
& K.P. ~~(C. Adad. Soi. U.R.S.S., 21st April 191+9, VoL.65, Nol
6, pp, 815-818. In Rugsian)
CurVe;s are shown for various alloys, the highest value.of magneto-
striation being found for the system 46%F % Pt. The effect of
e/54
different treatments on this alloy is studied.
immediate sourne clippirw,

Doe Physicomath Sci
BLUVp X. P.
Dissertation: "Magnetic-Elastic Effects in Ferromagnetic Materials in the Region of
Parsprocess.",
18/170/50
Moacow Order of lenin State U imeni
M. V. Lomonosov
SO Vecheryaya Moskv a
Surn 71

PA 165TSO
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7 ~
- - - . 1 16-9-60,
- - - --l -.1- ...... I ---, . ,

BELOV K P - QUSU,, A. redikktor, GOLUBr-VA, L.A., takhaicheiskly
Z;;;4*r~;iNt or
-1391astic' theratil W electitc pbenomons.in ferromagnetic
metals] iprugiii tiplovyo i ~1ektrfchqskje iavlantis v
ferromaguMfth metallakh. Koikfx.~Gos. ixd-vo tskhniko-
I
teoret, -lit-;ry, 19~1. 254 p. [Ki6rofil*3' (KLRA 7:12)
(rirromaguqtism),

BUOV, K. P.
INI'T o ~52
t c0_
'.,---~lavestigation.of-Magnetoelastic Phenomena in Fer..!
-romagnetics in the Region of the Paraprocess," P.
ov,- Sci-Res Tns'6f-Phys, Moscow State U
AkNauk, Ser. FizII Vol 16, No 4, pp 42o-431
_~_Discusses magrietoelasticity and magnetostriction
of-special nature due to magnetization
.-above the tedh.satn'pt 'during which momenta of
ar6 fully:'or .4 e'd in the direction of the
"Metic'field and-.mapetization increases slightly
ac
count: of var** of apin-within the domain.
PA 241T87

EMLOV'K.P.
Thermodynamics of volumetric and elastic phenomena In ferronag -
netic materials'near the Curie point. Uchesap, Hook, un no*162:15-20
152. (Yorromagnstism) (MLR& 8:7)

EBLOT.K.P.
A-W*"""040"
Temperature dependence of the susceptibility of the para-
process of invar alloys. Uch. sap. Moak. un. no.162:21-32
152-' (MM 8:7)
(Nickel- Iron alloys-Kagnetic properties)

B=V, K
Zrscheinungen In Ferromagnetischen Ketallen. Berlin, Technik, 1953.
222 P. Diagre., Tables.
Translation 7rom The Russian, "Uprcbglys Teplovyi I Zlektricheskiye I Zlektri-
cheskiye Tavleniya V 7erromagnitnvkh Ketallakh," Moscow, 1951.
,"Literaturd., At the end of each chapter.
SO: N/5
613.842
.334

270T90.

A
-Mlltf 34- Z:
aA A
!~V, Konstantin Petrovich, doktor fisiko-catematichookikh nank; PIM-
*79Wor: AIRLAXOV,S.N., tekhnichookiy redaktor
[What to magnetism?] Chto takoe magnetism. Koskya, Goo.isd-vo
takhniko-teoret.lit-ry, 1955. 62 p. (Nauchno-populiarnaia biblioteka,
no.81) (Magnetism) (MLRA 9:2)

JMWV KeP. -- ZAYTWA, G,A,
Calvanonsguatic properties "of ferromagastic materials near the
curie, point* lin. not. i MetalloTeds 1 A093:404-409 '55-
(KM 9: 6)
1*Noskovskir gomAarst TeuM usiversitat iseni X.Ve'Lomonosova.
(Ferro 'tism)

move Ke P,, GORYAGAj, A3 N.j, and PAMRSp Ye (Moscow)
"Thermodynamic Investigation of Ferromagnetics Substances In tha Region of
the Curie,temperaturej," a paper submitted at the International Conference on Physics
of Hagnetic Pbenomenes Sverdlovskj 23-31 :MBY 56.
14- ~15~

I K, Pot BOLSHOVA91;* M*j and YEMM, T. A*,, (Moscow)
"Tbe. Study of Megnatization- of, Farrites in the Region of the Curie
Point,- a Vaper subaiitted at the -International Conference on Physics
of Magnetic Phenomena,, Sverdlovsk,, 23-31 May 56.

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USsR / Magnetism. Ferromagnetism F-4
Abs Jour t Re.f'Zhur - Fizika, No 3., 1957,, No 6845
Author -I-41319Y3. K.P.
Inst Moscow State Universitys Moscow
Title Concerning the Thermodynamic Theory of Magnetoelastic and
Magnetostruction Phenomena in Ferromagnetics.
Orig Pub Fiz. metallov i metallovedeniye, 1956,, 2., No 3,, 447-453
Abstract The influence of elastic stresses on spontaneous magnetiza-
tion. and magneto3triction of the para-process near the Curie
point is examined from the themodyr=ic point of view. E-
qiationB are given for the dependence of these effects on
the elastic stresses, on the magnetic field, and on the tem-
perature. The theoretical deducUens are in agreement with
the experimental data.
Card 2 1A

V /VT1 N%
FUR I BOOK MWITATION 404
Belov) Konstantin Petrovich
Uprugiye., teploWe I elektricheoldye yavleniya v ferroaagnetikakti (Elastic,
Thermal and Electric Fhenmmmln rerromagnetie Xetals) 2d ed.) enl.
Moscov~ Gostekhizdat, 1957* 2T9 p. (Fizikoe-mstematicheskaya, bibliorteka
iuzhenera) 7,000 coPles printed.
Eds.: Alekseyev, D. M. and Denisov, 1. 1.; Tech. Ed.: -Akhlamovp S. N.
PURPOSE: The monograph is intended for.speciaLUsto engaged In the investigation,
research and utilization of magnetic materials. it can also be of use
to students of specialized vuzes.
COVEME*. The mouograph represents a systematic account of the latest data on
elastic., thermal and electric phenonena in ferromagnetie metals, alloys
and ferrites (magaetostriction, elastic stresi effect on magnetization,
galvano - and thermo magaetic effects, thermal expansion, heat CAY"Ity,
electric resistance, etc. The author has introduced,.wherever possible,
Card 1/1$

Elastic Thezzal and Electric (Cont.) 404
new experimental data., In )particular, the results of experiments made at the labora-
tories of Moscow University. He Me special attention to the presentation of eY.--
perimental results obtained frcm the study of elastioo.electric and change-of-volume
phenomena in the ferrazaipeiic metals and alloys In the tbird region of the magneti-
zation process (above tecbrdeal saturation and close to the Curie point). The author
studied. extensively the little exylpred ;henamena accompawling the third region of
the ~nagnetization process,.texued here the "pareprocess". The author describes In
detail the results of his own invistigations, which offer abetter understanding of
the, properties of Invar and Elinvaj? steel types., In writing the book, the author
took care to present th~ geriersi VWsIcal picture of the pehmmena, ideas and ex-
yerimental. data in such ayay'as to make the book accessible to engineers-and ficieil-
~Ist not specialists in '&4 field of ferrcmag- .3tiem,, an well as to students of =I-
versities and higher technical schools studying this field of solld-state'"Ics.
The first edition of the book was trazislated into German in 1953 under -the title
"Erscheinigungen in Perromagaetischen Ketallea.." This second edition contains
supplementary Informationic'n data published between 1951-2957. There are several*
referencei to Soviet personalties.in -the text#' There are 287 referencesp 181 of
which.aie Soviet (including 2 translations)., 58 Englishp 2B.Geratany 18 French.,
1 Czdch, 1 Ruianian
Card 2/4

137-58-1-1555
Translation from: Referativnyy zhurnal, Metallurgiya, 1958, Nr 1, r, 208 (USSR)
AUTHORS: Belov, K. P. Panina, I. K.
TITLE! Effect of the K State on the Temperature Dependence of Spon-
taneous Magnetization and Magnetos t ric tion (Vliyaniye K-
sostoyaniya na temperaturnuyu zavisimost' spontannoy namag-
nichennosti i magnitostriktsii)
PERIODICAL: Vestn. Mask, un-ta, sere matem., mekhan., astron. , fiz.,
khimii, 1957, Nr 1, pp 44-46
ABSTRACT: Measurement of the temperature dependence of spontaneous
magnetization (5s and the magnetostriction constant A was per-
formed on an invar-type alloy (3676 Ni, 616 Mo, 58% F~e), in
which ordering does not occur, The purpose of the tests was a
study of the low-temperature annealing in alloys in which a K
state obtains. After hardening from 9500C and 8-hour temper-
ing at 5000, an increase in electrical resistivity, which was
ascribed to the K state, was observed in the alloy. The vari-
ation of the (t) and >s= 5P(t)curves in the 20-200o
~interval was determined by extrapolation of the curves for the
Card 1/2 relationship of magnetostriction to the square of magnetization

137-58-1-1555'
Effect of the K State on (cont.
and by the method employing the thermodynamic coefficient. It is shown that
after heat treatment corresponding to that required for the formation of the K
state, the, alloy has two Curie temperatures (155 and 1680), testifying to the
app4arance of "atomic segregation", exhibiting the properties of a phase
with 1550 as its Curie(magnetic transformation) temperature.
V. R.
lo Magnetootriction-Temperatm-a effects % Malpatim-Mea'surewnt
Card 2/2

AUTHOR: Belov, K. and Paches, Ya.- 107
TITIB.: Temperature characteristic of spontaneous magnetisation in
alloys in the Curie-point temperature range. (0 tem peratur-
nom khode-zamoproizvollnoy na Snichennosti v splava khv
oblasti tochki kyuri.)

PERIODICAL: denie
'Fizika Metallov-i Metallove :?Wsioa--~z
?,. -5
Metallurgy), 195 (U S S.
ABSTRACT The curves of the temperuture dependence of spontaneous
magnetisation in the Curie-point range for nickel and some
nickel alloys were determined by three differing methods. It
was established that the so-called "tails" in the curves of
spontaneous magnetisation in the Curie point tem perature-range
are particularly large in these alloys. Their s hape and
length is strongly de penden1k; on the heat treatment and concen-
tration of the elemen t which is alloyed with the nickel. On
the basis of analysis of the exper�mental material on magnetic
and electric phenomena in nickel alloys a more accurate method
of determination of the Curie temperature is proposed. To
obtain reliable results on the temperature characteristics of
the spontaneous magnetisation n9ar the Curie point tha Curie
point was determinel for each specimen by the following t#ree
was determined
methods: the spontaneous magnetisation I
s
from the cu-ves "galvano-magnetic effect -square value of the
magaetisation", which were recorded for the specimens under

107
Temperature characteristic of spontaneous magnetisation in
alloys in the Curie-point temperature range. (Cont.)
consideration in the Curie point range; the values of Is
were'determined by the method of "lines of equal magaetisation"
which'is based on the evaluation of the magnetisation iso-
thems, recorded in the Curie temperature range and has been
described by Weiss and Forrer (Ann. d. Phys., 1926, 15- 153);
I was detenuined by the method of "Thermo-dynamic
cogfficients" described by Belov and Goryaga (same Journal,
19569 Vol-II, No-lt P-3, etc.) which is based on_comparing
the experimental magnetisation isotherms with the equatio4 of
the real magnetisation resulting from the thermo-dynaaic
theory of ferromagnetic transformation. The curves obtained
according to these three methods are compared. The Curie
point determined on the basis of tjL9 thermo-dynamic coeffic-
ients is always above , the maxJ milm o f the temperature
coefficient of the resistance and the negative galvano-
magnetic effect; at this temperature the major part of the
specimen is in the paramagnetic state and the I s (T) curve
has the character of a tail, which indicates that only small
sections of the specimen are in the ferromagnetic state.
-ion of the Curie poinv is
Therefore, this method of deteimimat
considered J-he most correct and it is simpler than measuring
the temperature dependence of such 51on-magnetic" phenomena
tric resistance, galvano-magnetic effect, the heat
as the elec

IOT
Temperature characteristic of spont-neous magnetisation in
alloys in the Curie-point temperature -range. (Conto)
capacity, etc., since in this case it is only necessary to
measure magnetic values. For non-uniform materials the
average Curie temperature can be determined from the curves
of the real magnetisation. The magnetic values were deter-
mined according to four different methods for the following
materials: Nickel; nickel + 3-l% Si, Ni + 4.9%-Si, same after
annealing, Ni + 2.5%-Mn, Ni + 2(Y% Mn, 38%, Ni + 52% Pe. The -
numerical data for these materials are given in a table, p.52.
5 figures, 1 table. 4 references, 2 of which are Russian.
Moscow State University imeni V.M. Lomonosov. Recd.Mar.21,
1956.

AUTHOR: ~~~~d Panina, I.K. 329
TITIB; Calculation of the shift in the Curie temperatuxe as a
-tNtction of the pressire on the basis of magnetostriction
A
Aata. (Vychislenie velichin smeshcheniya t&mperatury kyuri
ot davleniya iz magrLitostriktsionn;ykh dannykh.)
PERIODICP-L-. "Fizika Metallov i Yetallovedeniest (Physics of Metals ani
_
WfalTu
rU3, 1957, T01- IV, No-1 (109 PP-185-186 (U.S.S.R.)
ABSTRACT: On the basis of the theory of Type II phase transitions
an equation was derived in an earlier paper of the author
(same journal, 1956, Vol.2, No-3, P-447) for calculating the
real magaetisation near the Curie point, taking into consid-
eration elastic stresses acting on the ferro-magaetic:
(a + yAp) a + p a = H
where a - specific magaetisation;
A p - stress, for instance h ydrostatic pressure;
e and 0 - temperature dependen t thermodynamic coefficients;
y - magaetostriction.
It is shown that by detemining y from the magnetostriction
zVare of real magaetiBation curves measured near the Curie
point it is possible to carry out the desired calculations.
Calculated data are given for various Xi-Fe, Ni-Fe.-Co, Ni-Fe-Mc
Ni-Fe-W etas alloys. 2 graphs, 1 table, 5 references, four of
which are Russian.
Moscow State University
imeni M. V. Lomonosov. Reed. July 28, 1956.

AUTHORS: Belov, K.P., Goryaga, A.Up
TITLE: Effects of'Structural Properties of Ferromagnetioa
on ,tbe Dependence of Spontaneous Magnetization
(Vliyaniye strukturnykh ooobennostey ferromagnetikoy na tempera-
turnyy khod spontannoy namagnichennooti)
PERIODICAL: Izvestiya AN SSSR Seriya Fizicheakaya, 1957, Vol- 21, Nr 8,
PP- 1038 - 1046 (USSR)
ABSTRACT- It is maintained in this paper, that at present no systematic
experimental data on the effects produced by structural proper-
ties on the temperature dependence of the spontaneous magneti-
zation of alloys in the vicinity of the Curie-point are to be
found in publications. This paper furnishes such data with re-
spect to some nickel-alloys, which were obtained according to
two methods. 1.) the method by Weiss and Forrerl.which consists
in the extrapolation of the curves H(T) V'n const of spontaneous
magnetizatior. for different intensities of magnetization to the
value H - 01 and 2.) the method of thermodynamic coefficients,
according to the thermodynamic equation OL(Y+tt 6-3 - H ( 0-de-
Card 1/3 noting the specific magnetization, and~p ermodynamlic co-

48-0-1/25
Effects of Structural Properties of Ferromagnetica on the Tempera-
ture Dependence of Spontaneous Magnetization
efficients.). Three examples of alloys are considered in the
papers Hi-Cul Ni Un and Ni-Fe (invar alloy). In the first case
(Ni-Cu.) the auth9r arrives at the conclusion, that the tempera-
ture dependence of spontaneous magnet12ation, as well as the
thermodynamic coefficients OL-, 8 are very sensitive to varia-
tions of the concentration of the components in the vicinity
of the Curie point. A quantitative comparison of the values CC
the coefficients of such alloys with a varying copper-content is
only possible after a prolonged annealing (90 hre). A comparison
of the coefficients for nickel and nickel-copper alloys
showed, that the value of decreases with an increasing cop-
per content in the alloy. looording to the theory-by Voneovskiy
and Vlaeov in the case oj Ni-Cu alloys the-gradient'of the
straight line ( e- / c,' ) (T/9) decreases with-the decrease of'
the exchange-interloti8n (a-d). In the second case of the Ni Un
compound the author is lead to the conclusion, that the "tails"
of the curves of opontaneous magnetization d *o not shrink during
annealing, but grow in length, Ferromagnetic transformation is
weakened here. Therefore a regular arrangement is difficult to
Card 2/3 obtain. In t he third case of the Ni-Fe invar al-loy magnetic ano-

48-8-1/25
Effects of Structural Properties of Perromagnetica on the Tempera-
ture Dependence of Spontaneous Magnetization
malies are mentioned. The temperature dependence of spontaneous
magnetization near Curie point is hero dependent on thermic hi-
story. Experiments have shown in this case that the ferromagnetic
transformation of this alloy is extraordinarily weakened with
respect to the temperature interval. As a posuible source of
this phenomenon-it is consiaered, that the ferromagnetism in
such alloys is caused by an unstable atomic interaction in the
first sphere of coordination, as well as in the subsequent
spheres, which gives rise to the weakening of the ferromagnetic
transformtion. There are 13 figures, 2 tables and 12 referenceal
8 of which are Slavic.
ASSOCIATION: Dept. of physics' of thq Moscow State University imeni M.V. Lomo-
nosov (Fizicheskiy fakuftet Moskovskogo gos. universiteta im.
M.V. Lomonosova)
AVAILABLEt Library of Congress
Card 3/3

48-8-2/25
'IAUTHORSt Bolov, X.P., Bol'shova, K.M., Yelkina, T.A.
TITLEt Investigation of Ferrites in the Vicinity of the
Curie-Point (Issledovaniye namagnichtVaniya ferritov v oblasti
tochki Xyuri)
PERIODICALt Izvestiya AN SSSR, Seriya Fizicheakaya, 1957, Vol. 21, Nr 8,
pp. 1047 - 1054 (USSR)
ABSTRAM The paper under consideration deals with the magnetization pro-
cesses of some ferrites in order to determine the temperature
change on spontaneous magnetization near to the Curie point. It
is mairtained here, that such data are missing in literature,
altho,~gh they are of great importance, because the mechanism of
romagnetic phenomena in ferrites are different from ferromag-
netic metals. The sections of the paper are headedt
1.) Samples and methods, 7 samples of Mn-Zn ferrites with a
varying KnO content (20 1 40 ~6) and 2 ferrites of Co-Zn alloy
were selected. The measukng of the magnetization curves was
executed according to the ballistic methods The samples were
magnetized in a solenoid with a field strength of 2500 Oe. A
Card 1/3 ballistic differential winding, consisting of two sections of

46-8-2/25
Investigations of Ferrites in the Vicinity of the Curie-Point
4500 spires each on an ebonite body, was mounted on the electric
furnace containing the sample. Porcalibration a one-layer wind-
ing of thin wire was prepared, which was wound on a body of the
identical form and size as the sample. By introducing this wind-
ing im tead of the,sample calibration was effected. 2.) The
curves of actual magnetization of ferrites near the Curie pointi
Here it is established, that in this case the well-known thermo-
dynamical equation ot- + P T2 H - is applicabbt er denoting
the specific magnetization and T thermodynamical coeffi-
cients. The conclusion is drawn, that te sequence of the values
of the para-processes of ferrites under investigation corresponds
to the sequence of ferromagnetio metals. The theoretic relation
betwoen the intensity of the paraprocess and the value of the
Curie point is stated here as followas The lower the Curie point,
the veaker is the interaction and the higher the effect of the
excitation of the external field, implying a higher intensity nf
the paraprocesaes. 3.) The reaction of Un-Zn ferrites iff weak
fields near to the Curie point: Here the magnetic anomalies are
described, of which allegedly no data are to be found in litera-
Card 2/3 ture. These data consist of the fact, that the final magnetize-

48-8-2/25
Investigations of Ferrites in the Vicinity of the Curie-Point
ti4f the above-mentioned gn-Zn ferritesp starting f rom low
temperatures, first decreases at the approach of the Curie point,
startsto grow just before reaching the Curie point, and finally
falls off after reaching a certain maximum. The coercive force
behaves similarly$ which, in some cases, shows a very accentuated
rise from the minimum to the maximum. These anomalies can be re-
produced also, if the samples are isolated from the influence
of air. No anomalies of this kind were found in Co-Zn ferrites.
There are 9 figures, I table and 7 references, 5 of which are
Slavic.
ASSOCIATION% Dept. of Physics of the Moscow State University imeni M.V. Lo-
monosoy
(Fizicheskiy fakultet Moskovskogo gos. universiteta im. N.V.
Lomonosova)
AVAILABLE: Library of Congress
Card 3/3

A P
AUTHORS "OT K*P* PedfkoA.V. 56-3-50/59
TITLE 4n-nLe-~a vanomagnetio Properties of Forromagnetica Near lbsolute
Zero.
(0 gal4ranomagnitnykh svoystvakh ferromagnetikoy vblizi absolyutno-
go nulya t emp era turY)%;-.-(JAtter' r)
jo the Edito
FERIODICAL Zhurnal Ekeperimsi Teoret-Fiziki%1957,Vol 33,Nr 3,PP 815-817(US89)
ABSTRACT The observation made by Smith that,in a 42% Ni and a 58% Fe alloy,
9 does not only not diminish at the temperature of liquid nitrogen
and liquid hydrogen,but even inoreases,was confirmed by a more so-
curate determination of q at the temperature of liquid helium.Be-
sides, th.'j same was observed in the case of other ferromagnetic
alloys.
The following measurement values for Q were obtained for not anv
nealed alloys at the temperature of liquid heliuat
alloy Q. 108
42 Ni 58 Fe 31,6
50 ~ Ni: 50 Fe 15,6
2o % Cu, So % Ni 25,5
25 %f Cu, 75 76 Ni 11,6
23 % Un, 77 7- Hi 23,6
There are 2 figures.

AUTHORSs
~~-TITM
PERIODICAM
BBTRAM
Card 11h
56-6-35/47
Belov, Ke Po.l:.Talalayevat Ye. V.
The Galvanometric Properties of Manganese Ferrite (Galivanomagnit-
,nyye avoy.stva ferrita margantea)
Zhurnal, Ekeperimentallnoy i Teoreticheakoy Fiziki, 1957, Vol. 33,
Nr 6 (12), pi,_1517- 1519 (USBR)
I%e authors carried out measurements of the temperature dependence
of thegalvanometric,effect in a ferrite with 50 % (Mol-%) UnO and
50 % Fe 0 . Suoh a ferrite'did not have too great a resistance' and
on it R -; as possible to' measure the.effeot in the. case of direct
current in.thetemperatur4 interval of room temperature up to 350 0
The-ferrite. was produced by means of the usual "ceramic" technolo-
gy from chemically, pure oxides. As samples rods of 52 mm length
and 25 mm ;!. cross section were used. On the front surfaces cf the
samples the contacts for current feed were fitted by burning in
A silver pants, The-sample was located in a furnace with bifila 'r
windingi the'turnace itself was in a magnetizing solenoid. The
galvanometric effect was measured by the method of the bridge not
in equilibrium. At each given temperature the electric resiataZe,
the galvanometric effect &R/R , and the specific magnetization

" V.- ~ - - "JN I I ,
SUBJECT USSR / PHYSICS CARD 1 / 2 PA - 1864
AUTHOR BELOT K.? PANINA,I.K.
TITLE _R~e~ ~;N=;ination of the Spontaneous Deformation of the Lattice'
on the occasion of Perromagnetic Transformation.
PERIODICAL Dokl.Akaa.Kauk ill, faso-5, 985-987 (1957)
Issued; 1 /10-T
The present work describes a method for the determination of the spontaneous
deformation of the lattices of forromagnetica based upon measuring the temper-
ature dependence of magnetostrictiont and furnishes results for several alloys.
According to X.P.BELOV, F.M.M. (- ?) g. fase-3, (1956) the thermodynamic po-
tential of the ferromagneticum near CURIE temperature can be represented in the
f orm ~ - ~ 0 + acr2+ bcr4 + cp + dp,2+ ed2p - Hd. (a - specific magnetiza-
tion, p - mechanical voltage, Ha - energy of the magnetic fieldl a,b,o,d,e -
thermodynamic coefficients). Here d and e are proportional to the elasticity
modulus and the magnetostriction constant respectively. For the relative modi-
fioation of 1he volume W - c + 2dp + ed2 is found. For p - 0 it is true
that W m ad if the addititive constant is omitted. For a linear deformation
it holds that 901a+ di)?/3. Here cfa denotes spontaneous magnetization and
or i -true magnetization and it holds that o - da + dit Thusp the aforementioned
equation can be derived also by rigorous thermodynamic equations. This de-
pendenoe is also graphically represented. In the case of a lacking spontaneous

Dokl.Akad.Nauk 111, faso-5, 985-907 (1957) CARD 2 / 2 PA - 1864
magnotixationg also spontaneous deformation (at H - O)will be lacking. On the
occasion of the occurrence of spontaneous magnetizati-on (e.g. if temperature
is cooled *o less than Curie temperature), aleg spontaneous deformation of
the lattice occurs, which amounts to As ; ed /3. If % magnetic field i:n
appliedj true magnetization d i will occur ogether with a magnetostricti
which occurs in addition to the spontaneous deformation a of the lattice.
With the help of an attached diagram it is possible, after measuring the
magnetostriotion Ai (as a function of a square of magnetization) to deter-
mine not only spontaneous magnetization but also the spontaueous deformation
of the lattice of the ferromagnetioum caused by the exchange forces. A dia-
gram shows the curves (magnstostriction - square of magnetization) for the
alloy 31% Nit 5% Go, 64% Fe, which were recorded at different temperatures
and field trengths which were above technical saturation. According to this
diagram depends linearl on the square of true magnetization. Also the
temperature dependence of near CURIE point can be determined on the basis
of thermodynpmic considerations.
T) is foundt i9se
in the v 'icinity of CURIE temperature must depend linearly on T. In the
case of experiments carried out with alloys this linear dependence does not
always apply, which is due to inhomogeneities of the concentration of the
alloy. If the spontaneous deformation of the lattice is known, the ferromag-
netio anomaly of thermal expansion in the ferromagnetica can be determined.
INSTITUTION: Moscow State University.

240)
AUTHORS: Beloy, K.P. and Kadomtseva,A.M. SOV/55-58-2-17/35
11_~
TITLE: On the Influence of One-Sided Elastic Deformations on the
Curie Point of Ferromagnetics, (0 vliyanii odnostoronnikh
uprugikh deformatsiy na tochku Kyuri ferromagnetikov)
PERIODICALt, Vestnik Moskovskogo UniversitetatSeriya mat6mstiki, mekhanAki,
astrbriomii, fizikiJq'-kh4m'1:, W8,Nr 2,pp 133-136 (USSR)
ABSTRACT: An experimental investigation of the influe:ce of uni-
directional elastic tensions on the Curie point led to the
following reiultat The displacement of the Curie point under
unidirectional tension is three times smaller than under
universal tension and is essentially caused by the change in
volume which follows the tension. A torsion does not dis-
place the Curie point.
There are 3 figureag and 6 referencee, 4 of which are Soviett
and 2 American.
ASSOCIATIONi Katedra obahchey fiziki dlye, biologo-pochvennogo i dr. f-tov
(Chair of General Physics Of the Faculty of Soil Biology
and other Faculties) IMMOv Uhiv- I
SUMITTED: June 26, 1937
Card 1/1

240)
AUTHORS: Belov,K.P., and Ped1kof A-V, BOV/155-58-2-45/47
TITLEs The influence of the Paraprpoess on the Galvanomagnetic Effect of
Ferromagnetica,at Low Temperatures (Vliyaniye paroprotsessa na
gall vanniagaitun e f f ekt fe:rrgmwqtikov pri nizkikh temperaturakh)
PERIODICAL: Nauchnyye doklady vys hey shkoly. riziko-matematicheskiye nauki,
1958, Nr 2, pp 214-21; (USSR)
ABSTRiCTt This is a report on experimental measurements of the galvanomag-
netic effect i 'a ferromagnetio coMbinations for boiling temperatures
of nitrogen, hydrogen, and helium. The measurements showed the
insufficiency of,the formula proposed.by Smit [Ref 2]. For several
alloys a residua:L _ .,'g&I-Varomtric-, effect could be measured
(resich-1 effect). Two pos*~I~le interpretations for the appearance
of the -residue,3 effect aTe prop9sed. The authors thank Professor
A.I.Shallnikov for valuable s~ tWOians.
There are 2 tables, 5 figures, and 6 references, 4 of which are
Soviet, and 2 American.
ASSOCIATIONsMoskovskiy gosudaretvennyy universitet imeni M.T.Lomonosova
(Moscow State University imeni N.V.Lomonosov)
SUBMITTEDt January 13, 1958
Card 1/1

AUTHORSt Belov,K.P., and Talalayeva, Ye.V. SOV/155-58-2-46/47
TITLEz Temperature Dependence of tho Galv*nomagnetic Effect and the
Electric Resistanoe.of M4pganese Ferrite in Poly- and Mono-
crystalline States (Tempor~turn~yx savisimost' gallvanomagnitnogo
effekta i elektroaop;-qttv1qniya v ftzrite margantsa Y poli- i
monokristallioheskom soatpTfMiXa,1ch)
PERIODICA.Li hkoly. Fisiko-matematicheskiya nauki,
Nauohnyye doklady vy8sh
y
,:
1958, Nr 2, pp 220-227 U R)
7
ABSTRAM The comparison of ortperjments~ly measured electric resistances of
poly- and monoorysta 11ine-ma"aness forrites shows that they have
~ 200 ohm/cm, S
'800 ohm/cm)
the same order of magnitude (S
monocr
polyor
Herefrom it is concluded that the electric resistance of the
manganese ferrite is deteTMinel by the ferrite itself (not by the
boundary layers between the grain*). In the neighborhood of the
Curie-point the galvanomagnatic affect is influenced strongly by
the paraprocess; in the neighborhood of the Curie-point the curve

T ) has a complicated crack with a flat point. The authors
1g P
measured a positive component 9f the galvanomagnetic longitudinal
Card.1/2 effect unusual for ferrites. The results are compared with those

Temperature Dependence of the Galvagomagnotio Effectiand SOV/155-58-2-46/47
the Electric Resistance of Maings~Aeoe Ferrite in
Poly- and Monocrystalline States
of Komar and Xlyushin IRef 21, Irkin and urov fRef 101 and
others. The authors thank A.A.Popova (In itute of Crystallo-
graphy) for giving a crystil.
There are 9 figures, and 11 refqronoes, 1;',0 of which are Soviet,
and 1 American.
ASSOCIATIONtMoskovskiy gosudaretveanyy uniVersitat imeni M.V.Lomonosova
(Moscow State University imini M.V.Lomonosov)
SUBMITTED: January 15, 1958
Card 2/2

240)
Authors 0.1"0.,%.P. I camald.to of pk4olz&l- zCT/55-58-2-54/)5
Mathematical sciences
TITLIS Sursy of topers Xced by itopcov
UaLvoratty at %he ju.vajoh corgross an us r- ge., t4gzatte
Materials (Obzor dokla4ov ucVorrkz - ~'~ ca universi to
so vs*sOr"mon sov*shchaall po flalk6 . --.tmykh zalri-lov)
P22103MLs restalk Nooko,skozo Uaivoroit*ta.-..r'ys mteactIM, ocknavdbl,
"tr-011111, fSsik:1' MINAS, 195a. Yr 2.;p 247-:50 (VSSR)
ASSTRACTi Prom D*ce&Ur 6 - 11.1957 there took place, it-* fourth rnion
Cocere#* an physic- of "emetic motartals SO Leningrad. (Thc
ifirst two "ottap took place 7946 acA 1951 so Svorglovsko
Ib* third stooting 19 56 In Moscow). fte cor4rese woo oreanis.4
.F0AC&493W of Sciences at the 0:32. V.;Or-x#at of rhytic.l.
Satb."11cal sciences, Scl*ctifto co"C11 an Ndawnul
Problems; of Xsenotlan. Ica-Itato for Scalsocductors or the
&oadeny at Sctavaos, USSR &vA Cosusittev for Racnetteft. Ttoro
sort then $00 participatore, 59 Santurce wor. 'Cl.*O.
*A*%& then It. follo.img joeturas of tho rOprOvant%tlwO$ of
th* Moscow State CnLv.rolty c
1Professor A.T, Telospla. To.?. ZurltoyaA, Latturor *tr. the
T loolly of FAdmo%ic 1swersal of the F.rr#=a.-t1c&-.'
2. Professor R.T. Tol.irin. 7@.T. rArjh,.x1rA' Assistant
;0A Scene ISO fleceelty Of Cortices'.
rofols.r I.T. 'r.loorkin t.C. _'%.t-_hkvw. Aspirant
-moct or rAvwttc vs6coetty. Cc Lbe rrwqwocy Cbsractarlettgo
of torr&ZIP".
.LtAtrar, Lecturer *Tarlatioam of zorA4turo and Anit.
4. S.T. a
forrPijiftle proportion of S13?**.
1,A. GM)pwokly, Lecturer. S.Ta. Ircivics,yee Juntor ZoWairle
Asetwunt ~Zsdzotto Pro;ortleo of AlTootropic Zt4,res*.
G.P. Plyakov, L*cturcr 'Kapotostrict-or. troportl*v of
Stmary, AlloW.
Professor Is.:. Kq,:j1q)r.kIy. L.T. ASPi-tsAt
-Zlectria Prol.rzt.s at
I~ X;Z'_jLrjs#Ow' S.nlov Set *01, A.?. Pgrshr.*,,
L ptralt -Zaea.tio proper.. 0 tru:*Mra Of KdOgar.464
Soroa - Alloys,.
1I.I. Son 1if Sci.stift. Assistant. 1J. 9-10,
'So" i-roper-I.s of Forrit.&I.
ID. S.A. Aa.%Ots.t.
L.4turor -?ro;vrt3.a of_'" f.
_.-7-P4,Z
11. S.&. 3801-gov &&4 To 1. F-.~Cv. 1rrz...r 17r.;.rtgos of
7srrlt.. In It..
IT. Prof ... T.A.
T:11tiOe. Lecturer, art A ii, 01
A ~Titant "Forritoo T.IK :..; ... &-.I, r ;at
X.7-291OV. T6.7-:A'~s;_�.f_j1^. A-:.t..1 VJ
14. T.A;.'tWoj.-s. A.7.
Of -f
ProNos;r X.F. f-101, A.7. 'c:.rt9fle
kr~j,fj'
.., cf F#rrC%aC-tjo
Alloys $.Or St. Lb.cl.to :-r; of
The Psrt-#1P4t070 CC 'he A '00r.t*rj "t I..
.1r.9%it.to of of .r. CC Za ..... of tm
tPrZfes.or '..A.
.to a-q%1.r4 woo ty rr~r.s..r .I. 1cr-st's4sy,
T.c~-r. A'.1-23 C, *_-'-.%.-'..'_=I ?'IL It.*
tko C'"_'. ;_'JoCa~ for
1. X.J~.tc ,A Vf-to it. Zenon'.
Of I%. at,.. l.ra.
t--A V!-:!- Ir

AUTHORS: Belov X.P. and Zalesskiv, A.V. 70-3-3-33/36
TITIE-: The Thermal Expansion and Magnetostriction of Pyrrhotite
f (Teplovoye rasshireniye i magnitostriktsiya pirrotina)
PERIODICAL: Kristallografiya, 1958, Vol 3, Nr 3, PP 388 - 390
0 (USSR).
ABSTRACT: Measurements.of the thermal expan ion of pyrrhotite
(of composition about Fe.88) were made by a method already
described (Zh.Tekh.Fiz., 1953, Vol 23, p I and PTE, 1958,
Vol 4). Simultaneously, as a control, the magnetostriction
was measured by a ponderometric method. Curves are reproduced.
Four variables were measured against temperature-specific
magnetisation s in a field of 4960 Oe, magnetostriction X
in a field of 1880 Oe, relative extension dL/L and
coefficient of linear expan ion : cx The curve of the
temperature dependence of X , X(T) is very similar to that
of s(T) ; the magnetostriction is positive and small. In
the region of the Curie.point in the X(T) curve the
characteristic maximum or minimum corresponding to the volume
magnetostriction paraprocess is absent. The magnetostriction
paraprocess is also not apparent in the curve of X(H) as
Cardl/2 the field of 2000 Oe is still insufficient. Hence it is

The Tha ?0-3-3-33/36
-rmal Expansion and Magnetostriction off Pyrrhotite
impossible to estimate the sign and magnitude of the ferro-
magnetic anomaly in the thermal expansion at the Curie point,
a . The maximum of the magnetostrictLon, at the corresponding
PR'nt *:)H = 220 OC, can be observable or not observable,
depending on the rates of heating and cooling. In the dL/1
there 3.8 a sharp jump and in the a(T) curve a sharp m.
at 320 C. This temperature corresponds to !1 and
V dc -
a(T) shows no anomaly in the 330-340 00 nBgion. It is
concluded that the energy of the disordering of the vacancies is
much greater than the ener$y of spin disordering. Thence all
anomalies in the curves a(T) and X(T) and in the magnet-
isation/temperature curve are due to the energy of disordering
the vacancies. Because of the small energy of the spin d-is-
ordering the latter cannot substantially influence the ordering
of the vacancies and there is no mutual influence between
the prooesmof the orderin3 of spins and vacancies as Lotgering
believed (Philips Res. Rep., Vol 11, pp 190-2497 1956).
There are 2 figures and 5 references, 2 of which are Soviet,
2 English and 1 French.
&SEC51ATION: Institut kristallografi-i AN SSSR (Institute of
ar Cristallogrlhv Ac.Sc.USSR)
SUBMITTED: Oc obe 5~ 1

SOV/70-3-6-13/25
AUTHORS; Belov,.. -k-,4-opova, A.A. and Talalayeva, Ye.V.
LA
TITLR: The Electrical and Galvanomagnetic Properties of Single
Crystals of Manganese Ferrite (Blektricheskile i gall-
vanomagnitnyye svoystva monokristallov ferrita margantsa)
PMIODICAL: Kristallografila, 1958, Val 3, Nr 6, PP ?33-9 (USSR)
ABSTRACT: The temperature dependence of the electrical resistance and
the longitudinal galvanomagnetic effect in single crystals
of manganese ferrite have been measured. The temperature
dependence of the resistance is complicated. Near the
Curie point on the lines log r (1/T) breaks are
observed which have a step form. It is supposed that
these steps arise because at the Curie point crystals of
manganese ferrite transform to a degenerate electron
state. It is established that the dependence of the
longitudinal galvanomagnetic effect on temperature, field
and magnetisation is analogous to the dependence observed
in metal ferromagnetics. The crystals of.MnFe204 used
were made by the Verreil process and X-ray and chemical
-analysis were used to establish the orientation and
texture of the specimens which were rods of about
Cardl/3 0.2 cm 2 cross-section and 1 cm length. The specific

SOV/?0-3-o-13/25
The Electrical and Galvanomagnetic Properties of Single Crystals of
Manganese Ferrite
resistances r were of the same order as that of the
polycrystalline-material (1 Mom). The conductivity is
associated with the occurrence of ions in two valency
states in alternation in certain directions. The much
smaller conductivity observed here than in the case of
magnetite is a consequence of the presence of
me-21 Re3 and Mn~4 ions in the same set of equivalent
positions and the absence of Fe+3 ions . A graph of
the conductivity against temperature is given. Log r
against T'_l is roughly a straight line but is broken
into regions. Each can be described by r = A exp dH/kT
where dR has a different value for each of six sections,
namely 0,30, 0.26, 0.20. 0.32, 0.500sz/d 0.32 eV The
region near the Curie paint (n'ear 1 T = 1.8)
was studied more closely. It is thoug1t that on t?ie
transition from the paramagnetic state to the fer:,~o-
magnetic the semi-conductor passes through a state of
electronic degeneracy (as in a metal) and then becomes
a semi-conductor again. The slope "of the line log r(I/T)
should be less in the ferromagnetic state than in the
Card2/3 paramagnetic.

SOV/70-3-6-13/25
The Electrical and Galvanomagnetic rroper~ies of Single Crystals of
Manganese Ferrite
As in the case of most ferromagnetics, the longitudinal
Salvammagnetic effect in the region of technical magnet-
ijkation has a positive sign. With increasing temperature
the sign changes to0negative at lower and lower tempera-
tures until at 2?0 0 the sign is always negative. The
effect is also plotted out as a function of the square of
the specific magnetisation.
There are 10 figures, 1 table and 6 references, 4 of
which are Soviet, I French and 1 English.
(Institute
ASSOCIATION: Institut,kristallografii AN SSSR
of
Crystallography of.the Ac.Se.USSR) and
Moskovskiy gosudarstvennyy universitet im.
M.V. Lomonodova (University im. M. V. Lomonosov)
SUMITTED: July 12) 1958

SOV/126-6-4-7/34
-AUTHORS: Bolov, K.P.
Beloust YU.V.
TITIZ-. Hall Bffect in k1loys in the Region of Farromagmetic
Transformation (Effekt 10iolla v splavakh v oblasti
forromagaitnogo prevrashchaniya)
PERICDICAL:Fizika Metallov i Ifitallovedeniye, 1958,, Vo16.
Nr 49 pp.621-627 (USSR)
ABSTRACT: The temperature characterist- -e of the Hall constant
has a complicated shape, partdcularly in the neighbour-
hood.of the Curie point. Usually fthe Hall constant at
any temperature is~ determined fron the inclinatien.
angle of the Hall amf - magaetisation curves. Howtverg
the characteristic of these curves changes consid,,Prably
with the temperature. On approaching the Curie point
the role of the processes of displacement and rotation
decreases, whilst the role of the real magnetisation
(the para-process) becomes paramount. Thus from the
Hall emf - magaetisation curves some "mixed?' Hall
Card 1/5 constant is determined which is ~v-sed by the

Sov/12"-4-7,/34
Hall Effect in Alloys in the Region of Ferromagnetic
Transformation
03AOntatiOMLS Of the spontaneous magnetization, which
are due to the magnetic forces of the lattice and they
are also due to changes in this magmituie caused by
the exabange forces. The necessity of datermining two
separate Hall constants corresponding -to the processes
of o3Aentation of the magnetic moments of the domains,
and of the para-Process bas-been, pointed out for the
first time by VoIkov (Ref-7). The authors of this
paper have attempted to dispense with the usually
applied method of calculation of the Hall constant in
ferromagnetics from measured data. Since the
fundamental characteristic of a ferromagnetic is its.
spontaneous magaetisation Is, an attempt has been made
to separate from the experimental data the "spontaneous"
Hall effect and to study the variation of this effect
with the temperature. This iumthod of studying the
temperature dependence of the Hall offset excludes the
influence of magaetisation processes brought about by
Card 2/5 an external field. Investigwtion of the, temperature

SOV/126-6-4-7/34
Hall Effect in Alloys in the Region of Forromaguotic.
Transformation,
dependence of the "spo&,aneous" Hall effect is also
of intexestt from the point of view of verifying
conclusiorz based on quantum machanics theories of the
Hal I effe at in ferr,.,,magc*tias (Ref .8) in which this
effect is considered as being a function of the
magaetisation. The authors of this paper
investigated allcys with a high paraprocess (invar
steels), since. in such- steels it is easier to separate-
out the "spentaneous" Hall effect than in other
ferromagnatics. Furthermorev all the measurements
were carried out in the. region of ferromagaetic
transformation (near the Curie point) where the
processes of technical magaetisation are small, which
also makes the determinatim d the spontanew.-ts Hall
affect easier. The in-jestigations were carried out on
specimens of -the following compositionst
56.0% Co; 10.076 Cr; rest, It..
36.0% Ni; 6.Cf/o Oo; rest, Fe.
bard 3/5 31._5% Ni; 5.?% Gr-, rest Fe.

SOV/1266-4-7/34
Hall Eff*ct in Alloys in the Region of Ferromagnetic
Transf ormation
After manufacture, the 6 x 12 x 150 mm SpeC4m3ns
were subjected to homogenisation annealing in vacuum
at 100000 for 15 hours with subsequent slow cooling.
The magnetization was determined by a ballistic method.
The Hall emf was measured in accordance with a method
described by Ukoin (Rat-3) and Pugh (Ref.9) using a
photo-electro-Uptie amplifier as described by Kozyrov
(Ref.10)~ For each specimen the magnetisation and the
Hall amf as a function of the field at a given
tozparature were Measured simultaneously. The
temperature was varied by nw,,,ms of a furnace with a
bifiliar heating wire placed inside the solenoid vhich
generated the uni orm. magnetic field along the specimen.
-During the measurements the temperature was maintained
constant with an accuracy-of i 0.10C. The obtained
results are graphed in Fig.1-8. It was found that in
Card 4/5 the neighbourhood of the Curie point the Hall constant

SCYV/126-6-4-7/34
Hall Effect in Alloys in the Region of Ferromagattic
Transformation
shows a linear dependence on the square value of the
spontaneous magnetisation There are 8 figures and
11 references of which 6 ~re Soviet and 5 English,
ASSOCIATICK: Moskovskiy GosudarstvemM Universitat
Imeni M*V.Lomonosova (Moscow State University imeni
M.V.Lozonosov)
SUBMTM: Ist April 1957.
Card 5/5

AUTHORS: Bol'shova, K. M., SOV/48-22-10-23/23
Yelkina, T. A., Zayteeva, X. A.
TITLE; On Magnetic Properties of Ferrites Exhibiting a Compensation
Point (0 magnitnykh avoyetvakh ferritov s tochkoy
komponsatsii)
PERIODICAL:
A'BSTRACT:
Card 1/4
Izvestiya Akademii nauk SSSR. Seriya fizicheskaya, 1958,
Vol 22, Hr 10, pp 1282 - 1292 (USSR)
In the present paper the authors performed exact measure-
ments of the magnetic properties of mixed lithium chromite
ferritas (which were annealed and hardened) in the case of
different annealing after hardening. For the investigation
a system of ferromagnetic lithium spinels that contained
chromium of the common formula
Li20;(5 2a) Fe203 * 2 a Cr 203 (for a - 1,25; 1,5; 1,6; 1,7)
was synthetized. The following magnetic characteristics
were.investigated; 1) Temperature dependence of the spontan-
eous magnetization of a (T); 2) magnetic moments of the atoms
(the measurements were garried out by L. V. Pedlko)i
3) temperature dependence of the residual magnetization of

On Magnetic Propcrties of Ferrites Exhibiting SOY/48-22-10-23/23
a Compensation Point
0
the limiting Sycle in the temperature range of from -30 to
about 10to 20 above the compensation point (by the astatic
magnetome-ter); 4) temperature dependence of the paramagnetic
sensitivity (according to the ponderomotive method). The
measuring results showed that the ferromagnetic spinels
Li FeCr in a certain range of solution exhibit an anomalous
shape of the curve a a(T) with a compensation point. This
has been predicted by Neel. In contrast to the theory it
was found that the compensation never was perfect. The
phenomenon of an imperfect compensation may be explained by
the heterogeneity of the samples. At-, other considerably
greaterdifference is that the value of the absolute satura-
tion computed (according to Neel) from the distribution of
the cations does not agree at all with data found experimentally
(Table 2, column 3 and 5). The modification of Neel's
theory suggested by Yafet and Kittel (Ref 8) is capable of
explaining this discrepancy qualitatively. The explanation
is as follows: As the m'easured value of the magnetic value
in these ferrites is lower than the value computed according
Card 2/4 to Neel's theory and M B-" "A' in this case the negative,exchange

On' Magnetic Properties of Ferrites Exhibiting SOV/48-22-10-23/23
a Compensation Point
interaction within the eublattice B compared with the inter-
action between the sublattices A and B must not be neglected.
The measurements showed that the value of the absolute
saturation in the system LiFeCr-ferrites becomes higher
in the case of hardening. In technical publications there
are data on the influence of hardening upon 6 of various
simple and composed ferrites (Refs 10 and ll)oand theories
(Refs 12 - 14) explaining the results of the papers (Refs
10 and 11). According to this a 0 depends on the distribu-
tion of the cations on A and B. This distribution, however,
depends on the temperature. In the present case the problem
became more complicated as apart from the cation distribu-
tion also the variation.of the angles between the magnetic
moments in sublattices was possible. The possible influence
of these two factors excludes a comparison of the experimental
values found of saturation in hardening with respective
theories. The question e, the influence of these factors
probably might be answered by means of radiographic and
especially neutronographic investigations. The authors
Card 3/4 express.their gratitude to K. G. Khomyakov and T. I. Bulgakova

Ofi Magnetic Properties of Ferrites Exhibiting SOV/48-22-10-23/23
a Compensation Point
for valuable suggestions. There are 10 figures, 3 tables,
and 14 references, 4 of which are Soviet.
ASSOCIATION: Fizicheskiy fakulitat Moskovskogo gos.universiteta imeni
M.-V. Lomonosova (Npt. -z-f Physics at the Moscow State
University imeni M. V. Lomonosov)
Card 4/4 uscomm-Dc-6o.,966

AUTHOR- Belov, K. F. SOV153-65-?-9114
TITLE-. Perrcmagnetio and Antiferromagnetio Materials Near Curie Point
(Ferromagnetiki iantiferromagnetiki vblizi tochki Kyuri)
FMODICAL: Uspekhi fizicheakikh nauk, 1958, Vol. 65, Nr 2j pp, 1207-256 (USSR)
ABSTRACTs Recently much experimental material has accumulated with respect
to various pbysioal phenomena in metals, alloys, ferrites,
sulfides as well as ferromagnetio and antiferromagnetio materials.
It vmB the a1m,of the present paper to sort out and to arrange
this material systematically. In contrast to other papers, the
author here does not employ the method developed by Weiss (Veyss),
but the thermodynamical method developed by Soviet authors for
the description of phenomena within range of the Curie oint. The
last survey of this sort is by Gerlaoh (Gerlakh), 1939 ~Ref 5).
The themoaynamical theory was vrrkea out by Vonsovskiy and
Ginzburg (Refs 3-4) on the basis of the theory of phase transi-
tions (Landau, Ref 2).
The author first deals with the theory of the magnetization curve
Iwithin ihe range of the Curie point as well as with the tempera-
Card 1/4 ture dependence of the thermodynamical coefficient for various

Forromagnetio and Antiferromagnetic SOV/53-65-2-9/14
Materials Near Curie Point
alloys and the paraprocess in weak fields; numerous experimental
results are described in form of diagrams and tables. The course
taken by temperature in spontaneous magnetization and the datex-
of Curie temperature is discussed; for nickel and various
Ni-alloya (+ Si, + Mn, + Fe) a table shows the Curie temperatures
determined by various methods (method of the inaxim- of the
negative galvanometric effect, method of the --JTm- resistance
temperature coefficient, method of the thermodynamical coefficient,
and method of initial permea'bility). These methods are discussed
and described on the basis of experimental material. The influence
exercised by a structural change in alloys on the course taken by
temperature in the case of spontaneous magnetization and the in-
fluence exercised by elastic tensions on magnetization in the
course, of the paraprocess are dealt with by the following chapters,
The author then discusses the phenomenon of magnetos triot ion and
its dependence on R for various alloys (Ni-Co, Ni-Fe), the
spontaneous deformation of the lattice in ferromagnetic trans-
formation, and the shifting of Curie temperature under the influenc-a
Card 214 of elastic tensions in ferromagnetic materials. The magnetocalorio

Ferromagnetio, and Antiferrcmagnatic BOV/53-65-2-9/14
Materials Near Curie Point
and the galvanomagnetio effect within the range of the Curie
'temperature are then dealt with; numerous experimental results
obtained for various alloys are shown in form of diagrams.
The second part of this survey deals with antiferromagnetic
materials; this part comprises the following chapters:
1.) The temperature dependence of susceptibility and "nomagnetid'
properties. 2.) Neutronogram investigations (of UnO, YaY2,
FeF , CcF2j NiFq)- 3.) Resonance absorption. 4. ) The present
2
stage of the theory of antiferromagnetio transformation according
to Landau (Ref 40). 5.) Magnetio transitions in non-compensated
antiferrcmagnetic materials. 6.) The investigation of the tem-
perature dependence of magnetized ferrites with compensation
points (this chapter is dealt with in detail, the anomalous
temperature curves of numerous ferrites are represented by 8 dia-
grams). 7.) The electrical properties within range of the Curie
point (Fig )+I) clearly show the temperature dependence of the
galvanomagrietio effect of manganese ferrites for various different
Card Y4 H the family of curves AR (T) according to reference 81.
R

Ferromagnetic and AntiferromAgnetio SOV/53-65-2-9/14
Materials Hear Curie Point
8.) The nature of the weak "ferromagnetise in matter of the
hematite ty-ne, ana, finally 9.) The investigation of the magnetic
transformaiion in pyrrotin (an Fe-S-caarpouna).
All chapters contain a wealth of experimental material and
references, to en=erate which viould be beyond the scope of a
mere abstraot. There are 48 figures* 6 tables, and 94 referencesD
44 of which are Soviet.
1. Antiferromagnetism 2. Ferromagnetic materials-Analysis
3. Ferromagnetic materials--Te3t results 4. Thermodynamics
Card )h/4

AUTHORS: Belov K. P. Zaytseva, It. A.- BOY/53-66-1-8/11
.TITLE: New Mapetio Materials -Ferrite-Garnets (Novyye magnitnyye
materialy - ferrity-granaty)
PERIODICAL: Uspekhi tizicheskikh nauk, 1958, Vol. 66, Nr 1,
PP. 141 - 144 (USSR)
ABSTHACT; The.authors in extracts give the contents of a number of
foreign papers (mainly from the USA and from France)
dealing with ferrites of the formula-
3 Me 203' 5 Fe203 ( or Me 3Fe2Fe3012)*
There are 4 figures, I table, and 11 references.
1. Magnetic materials 2. Ferrites-Magnetic properties
3. Garnets--Magnetic properties
Card 1/1

PRAm i Boox mawITATION SOV/36%
Belovp Nonstantin Petrovich
Magnitwe prevmshchwAY& (Magmatic Transformation) Moscov., FizmatgL%,,
1959. 259 p. 7..000 copies printed.
Ed.: A. L. Chernyak; Teeh. Ed,; Yes A. Yermakovs.
PURPOSE: This book in Intended for scientific workerej, engineers, and aspirants
investigating magnetic phenomena and magnetic materials.
COVERAGE: Thin study of,magmetic transformations contains experimental data
on magnetic phenomena (farrimagmetism., antiferromagnetism, forromagaetic
resonance) in the region of the Curie point. The data obtained by the
an.thor and his aov*o'rkers vere interpreted by a thermodynamic method developed
by Soviet.scientists., as ve32 as by new m~ theories such as the s - d
electron exclonge model of S. V. Vonsovskiy- The thermodynamic method vas
used in analyzing the temperature dependence of spontaneous magnetization In
the neighborhood of the Curie point, an well as in determining the depend-
eace,,on magmatic field, e3astic strain,, and temperature of magnetic and
nonmagnetic phenomena in the neighborhood of the Curie point. Mw thermo-
Card 1/2,

3686
A Magnetic Ttansformation SOV/
dynandemethod enabled the researchers to show the offeat of elastic
strain on spontaneoua magnetization and magaetostriction accompanying the
paramagnetic processo and to establish more accurately the concept of the
Curie temperatureo The advantage of the thermodynamic method as compared
with the model theories is that it am be applied to the analysis of date on
all kinds of ferro- and ferrimaguets and that it reveals, the basic char-
acteristics in the behavior of ferro-.. ferri-p and antiferromagnets in the
ntighborhood of the Curie point. The author thomIr B. V., Vonsovskiyj
Corresponding Member of the Academy of Sciences USSR,, X. B. Vlasov, and
A. A. Gusev., There are 24 references: 114 Soviet, 87 English.. 25 French
and 14 German.
TAWZ OF, CONTENTS:.
Foreword 6
Chi, Is Thermodynamic Theory of Ylagastic Traurfornation
1. Second--tne phase transitions 11
Card 2/

2, .2 1~2 0
T 68049
AUTHORS Belovg X, P.v Leiritint-R. Z.' SOV/55-59-3-17/32
YX 10
TITLE: The Thermodynamic Theory of Antiferromaguetio ransformation
PERIODICAL: Vestnik-Mookovsko Seriya matematiki~ makhaniki,
,mo universitsta
astronom k1dmii;'1959, Nr 3, pp 129 -~ 133 (USSR)
ABSTRACT: In the simplest case, an antiferromaghetic may be represented as
consisting of two sublattices A and Bp the specific magnetiza-
tions of which,, without'a field, are of the same value and of
opposite,direction. Forthe expansion of the thermodynamic Do-
tential-near the Curie point
~O(T): + a a + A (04 + 04) +
2 + + '2 A B 4 A' B
Yl 2 + 62) p2 _ H(dA + a ) holds in this
2 B P + T26AdB P 2 B
case in consideration of elastic tensions.'Here and de-
dA dB
note the specific magnetizations of'the sublattices, P - pres-
a and 0 are the temperature-dependent ooefficiental
Card 113 sure 11 a2

68049
The~'Thermodynamio Theo ,ry of Antiferromagnetic, Transformation SOV/55-5.9-3-17/32
Card 2/3
y, and 72 are the magnetostriction constants, g '- the ;,;~oeffici-
ent of elasticity. For reasons ol~..simplicityq magnetic aniso-
tropy is,not taken into account. For the magnetization of anti-
.ferromagnetice near the Curie point (d1_+'I,P)de(a2_+ y2p)cY.2
3 3-R-0 holds; ExpreaL
+ PCr A. _H-0 and (a, +,.Yjp)cFb+(ae ?2p)(;A. + PB
sions are then'derived for.spontaneous magnetization and for
the Curie pointt for magnetic susceptibilityp the discontinuity
of specific heat.' the spontaneous deformation-of the latticeg,
the discontinuity of thermal dilatationt the discontinuities of
the coefficient of compression frrm all sidesp and the ratio
between the discontinuities at Curie point. Checking of these
relations is rendered difficult because of the lack of experi-,
mental data for the quantities Act Acc,, A%, etc'. for oat and the
same sample. An approximate evaluation is, however, possible
if the published data concerning.measurements carried out on
various samples are used. As an example$ antiferromagnatic CoO
is investigated. By using.the aforementioned formulas,
AC - 0.25 kal/g.deg is obtained..Por the Curie point shift due

68049
The Thermodynamic Theory of Antiferromagnstio Transformation 80V/55-5973-17/%
to pressu r0, a Wap 0.16 deg./(kg/cm 2) holds Thus, the Curie
point of Coo shifts considerably, more under the influence of
pressure then in the case of ferromagnetics. in an antiferro-
mwptic y, -~-r2 = 30a Lal,&C is found fer the magnetostric-
tion. constant.*, For-the. thermodynexic coefficient one finds,
1 46
%.- '00,53*102j;/cm3odeg. substitution y, - 72 - 50.10-7erg-2
is fbund.*This does, however, not mean that the volume magneto-
striotion in COO is also greater than in Invar-alloys..There
are,8-referencea, 4 of which are Soviet.
ASSOCIATION: Kafedra obehohey fiziki dlya::biologo-pochvennogo fakulfteta
(Chair for'General Physics for the Department of Biology
Soil Science)
SUMaTTED: March 3, 1959
Card 3/3

24 (G)
AUTHORt
TITLEt
PERIODICALs.
ABSTRACTt
Card 1/2
Belov, _L___P_.1,Professor SOV/30-59-10-44/51
Ferromagnetic Semiconductors
Vestnik Akademii nauk SSSRI 1959, Hr 10# pp 108-109 (USSR)
The 3rd All-Union Conference was hold in Minsk from June 1 to
7, 1959- It was devoted to problems of physics, physico-'
chemical properties, and physical fundamentals of the utilizaticn
of ferrites. Reports were submitted for the first time oh'the
investigation of magnetic and electric properties of fekfi:te
monoorystals. At the Institut kristallografii Akademii nauk
SSSR (Institute of Crystallography of the Academy of Soi4hoes,
USSR) large ferrite monocrystals with a spinel structuie4ire
now being prepared. They are to provide the means of invebtigat-
irjg- the magnetic anisotropy, galvanomagnetic effeetso' ferro-
magnetic resonance, and the rotation of the polarization'-plane
of electromagnetic waves. The Institut poluprovodnikov (Institute
of Semiconductors), and the Physics Department of Moscow -` -
University, reported on the investigation of ferrites of"rare-
earth elements. The Conference discussed problems of the
chemistry and technology of obtaining polyerystaliAne ferrites

Ferromagnetic Semiconductors
SOV/30-59-10-44/51
of high technical importance (Department of General Chemistry
of Moscow University). The Akademiya nauk BSSR (Ao:adeay of
Sciences, Belorusskaya SSR), and the Physics Department of
Moscow University, repor';ed on the static magnetic character-
istics of ferrites with,& rectangular hysteresis loop. The
Institutfi,ziki*m,etallo-r Akademii nauk SSSR (Institute of
Metal Physics of the Academy of Sciences, USSR) reported on
the investigation of the domain structure of barium ferrites.
Further,problems on the agenda concerned magnetic spectroscopyl
magnetooptics, and the behavior of ferrites in superhigh
frequencies. Reports were delivered by the Institute of Metal
Physics and the Institute of Crystallography concerning the
theory of antiferromagnetiem and the magnetic aniuotropy of
ferrites. Finally, the author states with regret that the
number of theoretical reports was very small, and that many
theoretical questions remain as yet unanswered. The application
of neutronographic methods to the investigation of atomic and
magnetic structure in ferrite- and antiferromagnetic materials
should be intensified.
Card 2/2

240) SOV/56-36-4-14/7c
AU TITORS Belov, X. P., Sirota, Z. D.
TITLZ;: The Influence of the Atomic Ordering on Exchange Interaction
in an Fe3Pt-Alloy (viiyaniye atoninol;o uporyadocheniya na ob-
mennoye vzainodcystvi~a v splave Fe 3Pt)
P',: 7110 D I C." LZhurnal cksperimentallnoy i tooraticheckoy fiziki, 1959,
Vol 36, lir 4, PP 1058-lo62 (USSR)
ABSTRAC'
T: The riagnetic, properties of Fe-Pt-alloys with a composition
that is a near approach to Fe.-Pt have, especially within range
of the Curie point, a number 8t characteristic features. A
contribution is made by this paper toward the research of these
properties by the investigation of the influence exercised
by atomic ordering upon magnetostriction and the accompanying
paraprocesses in such alloys. Already Belov (Ref 4) has shown
that such an investigation of magnetostriction may furnish
data on the connection between exchange interaction and inter-
atomic distances. Samples consisting of 50 by weight of Pt
and 42~.' by weight of Fe were investigated near the stoichio-
Card 1/# metric composition Fe 3Pt. The Xurnakov point of this alloy was

SOV/56-36-4-14/70
The Influence of the Atomic Ordering on Exchange Interaction in an Fe Pt-
Alloy 3
between 900 10000C. The samples had the shape of a bar of
1
t50 mm lenGth and 3 mm diameter. They were tempered at 10200C
in a vacuum furnace, after which they were chilled in water
for the purpose of fixing the disordered state. The ordered
state was established by annealing at 6000C over various
periods of time (from 20 min to 12 hours). After each annealing
the curve of the temperature dopendence of magnetostriction
was plotted (Fig 1)- figures 2 and 3 show the course of these
curves af ter annealing at 6000; they show the characteristic
variations within the range of Curie point. Figure 4 shows the
dependence of the spontaneous lattice deformation.,\,, on t~a
square of spontaneous magnetization as. The course measure3
agrees with the thermodynamic theory according to which
)~'s = 1/6ra 2 holds, whereAli3 the coefficient of spontar-ecus
s
lattice deformation. Figure 5 shows the same as figure 4j but
here the individual curves for each different period cf
nealing are given. Xincreases linearly with increasing
Card 2/0, this increase is all the more rapid, the shorter the time of

SOY/56-36-4-14/70
The Influence of the Atomic Ordering on Exchange Interaction in an Fe Pt-
Alloy 3
annealing, (i.e. the lower the ordering), but the steepness
of the straight line does not decrease linearly with an in-
crease of the duration of annealing. It further holds that
dG/dP - -,r1aq'; a denotes derivation of the thermodynamic
co,-I'ficient a according to temperature, determined from the
curve of real magnetization near Curie point. Figure 6 shows
the temperature dependence of a near the Curie point in the
case of orderingo of different magnitudes, i.e. annealing for
different lengths of time. The last part of this paper deals
with the determination of dQ/dP. Figure 7 sho-s the dependence
of the shifting of Curio point on pressure, as well as the
dependence of the coeffiaienta'and of Curie temperature on the
degree of ordering. It was found that atomic ordering varies
not only the magnitude of exchange interaction, but that it
also influences the nature of its dependence on interatomic
distances. There are 7 figures and 6 references, 4,0f which
are Soviet.
Card 3/f,
3

24(2), 240)
AUTHORSi Beloyj_~~, ZVtseva, M. A., BOV/56-36-5-66/76
Malevskayaj L. A.
TITLE: The Magnetic- and Resonance Properties of the
Ferrite Garnets of Yttrium in the Substitution of
F1 3+-Ions by Cr3+- and A13+-Ions (Magnitnyye i
rezonananyye avoystva ferritov-granatov ittriya, pri
zameshchenii ionov Fe3+ ionami Cr 3+ J. A13+)
PERIODICAL: Zhurnal eksperimentalinoy i teoreticheskoy fiziki, 1959,
Vol 36v Nr 5s pp 1602-1603 (USSR)
ABSTRACT: The present "Letter to the Editor" is in close connection
with the preceding one (pp 1600-1601). The present letter
d--als mainly with the investigation of the influence
exerted by foreign ions on the physical character. The
stoichiometrio compound 3Y 2 0,05Fe203 is conveyed to
3Y20 3-(5-a)Fe203* aA1203and 3Y2 03' (5-a)Fe203* aCr203
respectively'by the substitutions.'a denotes the content
Card 1/3 of Al 3+ and Cr3+ ions. Measurements of the magnetic- and

The Magnetic- and Resonance Properties of the BOV/56-36-5-66/76
Ferrite Granates of Yttrium in the Substitution of
'3+_Ions by Cr3+_ and A13+_Ions
e
F
resonance-characteristics weA!e carried out on crystalline
Isamples (sintering in air at 13000C for 4 hours, density
2.75 g/Om3)..Figure 1 shows the connection between a and
the saturation magnetization a-0 as well as between a and
Curie point e in the range 0-!!-~ a i6 1. All f3ur curves
Cr , 6 for A13+ and Cr3+) show a more or less steep
0
decline with increasing a, with the exception of the
chromium-substituted sample which shows an incline at
a < 0.5 for 0'00 Figure 2 shows the fesults obtained by
measurements of the width of the absorption lines U.
.With increasing a there is an increase of AH for the
chromium-substituted samplef and a decrease for the
Al-substituted sample. For the former the g-factor increases
from 2-15CL+0-005 (unsubstituted sample) to 2.200+0.005,
Card 2/3 in the case of the latter it increases loo 2.030-+70.005-

The Magnetic- and Resonance Properties of the SOV156-36-5-66176
Fe'rrite Granates of Yttrium in the Substitution of
Fe3+_Ions by Gr3+- and A13+_Ions
The ratios found agree qualitatively with the theory
developed by Clogston et al. (Ref 4), 1. e. that 6H
is proportional to VFO and e. There are 2 figures and 4
references.
ASSOCIATIONt Moskovskiy gosudarstvannyy universitet (Moscow state
University)
SUBMITTEDs February 12, 1959
Card 3/3

240) SOV/56-36-6-7/66
AUTHORSt. Belov, K. P., Zayteeval M. A., Pedtko, A. V.
TITLE: On the Magnetic Properties of Oxygen Compounds of Gadolinium.
(0 magnitnykh svoystvakh okisnykh soyedineniy gadoliniya)
PERIODICALs Zhurnal eksperimentalinoy i teoreticheskoy fiziki, 1959,
Vol 36, Nr 6, pp 1672 - 1679 (USSR)
ABSTRACT: Considerable interest is at present being displayed in the
magnetic properties of the oxides (ferrites) of rare earths.
The authors of the present paper investigated the temperature
d endence of the magnetic prop-.rties of various gadolinium.
oxides; the samples were of garnet- or perovskite structure and
were, contrary to what was the case in earlier investigations
(Refs 1,2) sufficiently large, so that the data obtained were
more accurate. The samples were tempered in air at Q,OOOC for
6 hours* pressed into shape (block 60-5-5 mm) under high pressure,
after which they were again tempered for 4 hours at 13000C. The
magnetic properties were measured by ballistic, magnetometric
and ponderomotoric means. Gandolinium ferrite garnets were
subjected to the closest investigation. The authors operated
Card 1/ with I3Gd205* 4-8Fe203* MY203'They investigated saturation

On the Magnetic Properties of Oxygen Compounds of SOV/56-36-6--7/66
Gadolinium
magnetization at helium temperaturos and at Curie point
(Q.- 5610K), coercive force, . magnetostriction, etc. The results
obtained by the investigations are shown by numerous diagrams
and are discussed in detail. Figure I shows the temperature
dependence of specific magnetization at various field strengths
(H. 25.81.129 and 1550 Oe)f figure 2 shows the temperature
dependence of 68/60 and of the residualmagnetizatimS/I_' within
the range of compensation point, figure 3 shows the temperature
dependence of the coercive foree, and figure 4 the temperature
dependence of the susceptibility of the paraprocess in
3Gd203' 5Fe20,; figure 5 shows the temperature dependence of
magnetoatriction, figure 6 the dependence of (%/a 0 )2on (T/0)
within the range of the Curie point (straight linel, and
figure 7 the dependence of the magnetization on H1/3 within
the range of the Curie point. In a table the data of the garnet
investigated are compared with those of other ferri- and feiio_
magnetics. It is found that at the compensation point and
Curie point there is an anomalous growth of the coercive force
Card 2 and a very small paraprocess in garnet-ferrite and also an

On the Magnetic Properties of Oxygen Compounds of SOV/56-36-6-7/66
Gadolinium
anomaly in the behavior of.the temperature dependence of
magnetostriction. Further results obtained by investigations
concern gadoliniam ferrite-Derovskite Gd 0 Fe 0 . Figure
2 3* 2 3
8 shows the dependence of mignatization. on the field (up 0
to H- 7000 00) for various ,,emperatures between 18 and 598 09
and figure 9 shows the analcgous magnetization isothermal lines,
but after heating.beyond Curie point in the magnetic field.
Figure 10 shows the temperature dependence of spontaneous
magnetization In the magnetic field after the first and second
heating (the curves differ considerably). It is found that I
perovskite gadolinium ferrite possesses a weak ferromagnetism
of the hematite type. Finally, the results obtained by an in-
vestigation of gadolinium-manganite (perovskite) are described.
Figute 11 shows the H-dependence of magnetization at various
temperaiures, and figure 12 the hysteresis in Gd 20 3* Mn 203 at
4-30K, which may be observed within this temperature range
although gadolinium manganite otherwise has paramagnetic pro-
Card 3/ perties, There are 12 figures, 1 table, and 6 references, 4
of which are Soviet.

240)
AUTHORS:
TITLE:
PERIODICAL;
LBSTRACTt
Card 1/y
2,
SOV/56-37-2-42/56
Belov, K. R. Z.
Xagnetostriction of Antiferrom W atio Nickel Monoxide
Zhurnal eksp6rimentallnoy i teorotioheakoy fisiki, 1959,
Vol 37, Nr 2(,S)) pp 565-566 (USSR)
Information on the magnetostriction of antiferromagnetio sub-
stances has hithertd.been,scarce. It follows from general con-
siderationa (existence of a domain structure) that the magne"to-
striction of antiferromagr~-%ics must be quite considerable and.
in any case-stronger than in ordinary paramagnstios. The mag- .
netostriction of polyarystalline'liO prepared by usual sintering
methods was determined. In field not exceeding LOWOe the
sunceptibility is only weakly dependent upon the field strength.
and amounts to 6.10,6. The Curie-p8int was determined1roA tha
jump of Young's modulus to be 251 . These results correspond
with those obtained by other authors (Ref 1). The magneto-
striction was measured by means of a wire transducer, using a
photo-electro-optical amplifier. In a diagram the transverse
magnetostriotion versus temperature funetion measured in a

sov/56-37-2-42/56
Magnetostriction of Antiferromagnetic Nickel Monoxide
field of 14,200 09 is given. Thia magnetostriotion is nogative
and deoreases monotonously on approaching,Curie-poiut.-In the
second diagram the transverse magnetostriction versus ftAld-
strength function is given-for different temperatures, and the
longitudinal magnetostriction at room temperature. The letter
is positive. A certain "critical" f ield- strength (H rj 5,000 Oe)
below which the magnetostriation is practically zeio,hae been
found. Only after surpassing this field strength;-dbes the
magnetostriction begin to increase. According to the authoral
opinion, the magnotoetriction in antiferromagnetic nickel
monoxide is caused by the existence of a domain structure.
This is also indicated by a reduction of the effect with rising
.temperature and the different signs of the transverse and lon--
gitudinal effect. The existence of a critical field strength,
is, according to the authors, connected with the existence of
a coercive force. k reduction of Young's Modulus has also been
found when a strong magnetic field was applied (antiferro-
magnetic AR effect). This also indicates the'oecurrence of
Card 2/1 magnetostriction in antiferromagnetic nickel monoxide. UMW

_ff=v,_K.P.; UUYXV, G.I.; LEVITIN, RA.
Internal friction anomalies and modulus of elanticity In
forromagnatic imterials near tba Curie point& Zhur,okspel tooro
fix. 37 no.4:938-943 0 159. (MEL 13.5)
1. Moskovskly gosudarstvamwy universitst.
- (Hagnetism)
Characterist cetof as r
."I , g~et c. byste esis phenomena in the systems-.
Jr 203* Pe203and- "A203- Fe203 Zhir.sksp.i te0r,fls- 37.
no.4:1159-1161 0 159. (MR& 13:51

PRISS I BDOX EMOITATION SWAM
Toomorix"O" soveshchanl" p0 fitike. flelka-Mialehoaklm evOySt"I
M
forrltow I fizleho$klu asnovan lkh primenonlys. 3d, Pinsk. I

Ferri Dokl.dy
ty; rlzlcbookly* I fUlko-khIsicheaki" avoystva.
(FarrIteol Physical and Phyalcothestcal Properties. Reports)
Kinair, Izd-vo AN B63R. 1960. 655 P. Zrrata slip InSerted,
4,000 copies printed.
Spo' $*ring Agencies: lauchnyy sovot po magnotizzu An SSSR. Otdol
;LxlkL tyerdago tola I poluprovodnik*v AN B339.
ZditorL&l Boardt Kemp. Rd. : X. X. Sirotao Academician 0; the
Academy of Sciences BSSA: K. P. Belov. Professor; Ia. 1. Kondar-
"17, ft-ofeamor; 1. P1. roltvangv; Professor- R. T. Telonnin, h,*-
reemor: 0. A. Smolonsitly, Professor: X. N. Shol*to. Candidate of
rhyst"I and rAthematicez Sciences; S. N. Smolyarrnlco: and
L. A. Bashk1mv; 5d. of Publishing House& 3. sholyavsklyl T*eh.
Xd.Z 1. TolakhanOvigh.
9 d_r6F-physjcjjfS-,phjV-j`ca-l c-rcgTst.;- -
radio *I*dtronles engineers, and technical personnol tv&"ed In
the FrOd CtIon Ind use Of forromagnatia materials. Zt may also
be u"d by students In advanced courses in radio ol~ctrw1ca~,
PhYS140. and Physical chemistry.
CGTZRAQXs The bOGIC contains reports Presented at the Third All-
Union Conference an Perrit4o hold In KIns1c. Belorussian 33R.
The .4 PO. to deal with magnstle transformations, electrical and

"
*tie properties or rtrrites, Studios or the growth
In
V
=
.
I.
r
o
single CrYmt&l . Problems In the chemical and phyal-
coebsoull. snaira 1. at ro
4lt**. Studies of forritas having
rOetangu,~.r hysteresis loops and sultloomponant ferrite systems
exhlbltlng.bv.~twwoum rectangularity, problems in magnetic

attr"tloo, highly Coercive f*rrlt*~,
magnetic Spectroscopy,
forromagn*11a resonance, magnoto-optics, physical principles of
VOIDS fOrrIt4 components In electrical circuits, anisotropy of
electrical and as tic properties, ate. The Committee on Rag-
I"
nstlmn~ A3-MR (
T. Vonsovokly, Chairman) Organized the can-
for*=*.,.- References ~ accompany individual QrtleLeS..
of tA- Rectangular Elystorsolm Loop 23
XTurovo To. A., and.A. 1. RItSek. Theory of the Tomporaturs
Depeadewo of the JFA_Vr6TrF7&TMrOP7 COWtWTt Of YOMOSmg-
Setles and romltoo 28

*
_Tlm�2L_R--V_ and tation or the
~
N
;
161~--tlom hant
.a...
tlcal2Y Polarized
.
.

Syrkini 7- 'N. Discussion of the [Protedingl Report 48
31rota, W. M. 2b~ ftralcochealeal Maturv or Plerr1tes sW
Their ft*parties 50
xslrota, W. X., S. A. CvvUehuk, and N. P. T,%novich.
-Me- NW*tlc TME18rorMatLon or
Some Yoc=2Larlfros 07 ~WtLan or
PeftItes at Curie Point 74
and --Z---Ltl- kainstoelastio Phenomena
To
'A I ~MIOV. A
J-Z 1 -1 j
~
:
Mgn* -a&" - =gancze Ferrite
.
Single Crystals 83
_%LtaZL_.L._ 0_. Growing rarrits Single 6rystals Vith
3tructuzv-W-the Oarnot Type 89
Card 4A8
7,1' 7 V.,

84321
S/070/60/005/003/007/017
8132/E36o
AUTHORS: Belov, K.P. and Nikitin, S.A.
TITLE: Study of the Low-temperature Transformation in a
Crystal of Manganese Ferrite
PERIODICAL: Kristallograflya, 1960, Vol. 5,.No. 5.
pp. 726 - 731
0
TEXT: At about -75 C in a single crystal of manganese ferrite
anomalies in the curves of electrical resistance and galvano-
mognetic effect against temperature have been discovered.
These must be connectea with the existence of a low-temperature
transition. The electrical and magnetic properties of manganese
ferrite change less~sharply than those of magnetize at this
transition. From the energy of activation it is suggested that
the low-temperature transition is connected with the exchange
-of electrons between manganese ions.
It has been suggested by Verwey that the low-temperature
transition observed in magnetIte Is due to the ordering of the
two- and three-valent iron ions in the octahedral positions
caused by the exchange of electrons (electron diffusion).
Single crystals of the ferrites MnO.Fe.O~ ard Fe 0 were made
Card 1/; 3

S/070/60/005/005/007/017
E132/E360
Study of the Low-temperature Transformation in a Crystal of
Manganese Ferrite
by the Verneuil process. They were rods about 35 em long and
5 mm in diameter. The rod axis was -11 11 , the direction of
easy magnetisation. Electrical contac.U were made with silver
paste. A vacuum of I)etter than 10 mm HS was maintained in
the.cryostat. The values for the activation energy of the
manganese ferrite of 0.27 and 0.21 eV determined from the
temperature dependence of the conductivity agree with the
value of 0-3 eV found by Gibbons (J. Appl. Phys., Vol. 28,
810, 1957) determined from the temperature dependence of the
coefficient of Internal friction. In magnetite this energy
is less than 0.04 eV. In the manganese ferrite, besides the
exchange of electrons between Mn +4 and Mn +3 ions there is also
the possibility of the formation of Mn+3, ions.
Card 2/0

84122
S/070/69/005/005/008/017
B132/E36o
AUTHORS; Belov~-K.P Belov, V.F. and Timofeyeva, V.A.
TITLE: Ferromagnetic Resonancetn Single CrystalsODf
Yttrium Perr:Ltl&Vn the Temperature Range from Room
Temperature to ffie Curie Point
PERIODICAL: Kristallograflya, 196o, Vol. 5, No. 5,
pp. 732 - 736
TEXT. The temperature dependence of the parameters of the
f erromagnetle re
sonance in single crystals of yttrium ferrite
(garnet) from 20 to 300 OC has been measured. With increasing
temperature the constant of the magnetic anisotropy (Ki)
decreases but the g-factor scarcely changes. The resonant
absorption line -width H also decreases but grows again towards
the Curie pointo The effect of the different degrees of
polishing oix the line width was also studied. Crystals were
grown by the method of Nielsen and Dearborn (J. Phys. Chem.
Solids, Vol. 5, 202, 1958) In the form of tetrakis trioctahedra
or of combinations of this form with the rhombic dodec.-O-qd-ron.
These were ground into spheres of 0.8 to 1.0 mm diametv; tna
.,Card 1/t

84122
S/070/60/005/005/008/011
E132/E36o
Ferromagnetic Resonance in Single Crystals of Yttrium Ferrite
in the Temperature Range from Room Temperature to the C-arie Point
measurements were made at 9470 Me/a. The spheres we re oriented
magnetically and mounted in a resonance chamber. With the size
of sphere used, produced by air grinding, there was no correction
for the size of the sphere. The surface finish, however,
seriously affected the line width and the final polishing paper
had a grain size of 1 ji. If the polishing powder had a grain
size of 100 ji then the line width was 15 Oe but with th.3 finest.
grinding this was reduced to 2-3 Oe.~ The Lando' g-factor was
found, as was expected from spectroscopic data, to be slightly
different from 2 . On three specimens it was measured.as 2.03,
2.02 and 2.01,in each case -~*O-003. The resonance Tagnetic
field for the three directions (10031 [11g, and 111)
approached each other from the values of 34 3347 and 3313 Oe,
respectively, at 20 0C and converged to the value 3364 Oe at
250 0C.
Card 2/A

6970.?
s/126/60/009/03/029/033
02 'I..2Q 0 0 B032/E414
AUTHORSi Belo V, K*Po and Nikitint S.A.
TITLEs T-e-mp~erature Dependence of Spontaneous Magnetization in
a Monocrystal of a Manganese Ferrite in the Low
-Temperature g on 21
PERIODICALt Fizika metaltlov.i metallovedeniye, 1960, Vol 9, Nr 3,
PP 470-472 (USSR)
ABSTRACT: Recent work (Ref I to 5) on the quantum mechanical
theory of the temperature dependence of spontaneous
magnetization in the case of ferrites near O*K has led
to conflicting results. In most cases a T3/2 law was
obtained while In others the law was found-to be T2.
On the other hand, Tyablikov (Ref 3) has shown that
either of these two laws may hold, depending on the
origin of the magnetic non-equivalence of the sub-
lattices.- The present paper reports results of
measurements of the spontaneous magnetization of a
monocrystal of manganese ferrite, in the temperature
region 4.2*X to room temperature. The monocrystal was
in the form of a cylinder 35 mm long and 5 mm in diameter.
Card 1/3 It was grown by A.A.Popova (Ref 7). The easy