SCIENTIFIC ABSTRACT GORYACHUN, N.P. - GORYAINOV, FEDOR ALEKSEYEVICH

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• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

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GORYAGHU. H.P.. inzh.
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GORYAGA, A. N., BELOV, K. P. ~ and FAVES, Y. (Moscow)
"Thermodynamic Investigation of Ferromagnetics Substances in the
'Region of the Curie Tempercture," paper presented at the International Conference
on Physics of Magntic Phenomena, Sverdlovsk, USSR, 23-31 may 1956.

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C)Y
48-8-1/25
AUTHORS: Belov, K*P.0 Goryaga, A.He
TITIX.- Effects of Structural Properties of Ferromagnetica
on +,be 26spaft%m,-. . Dependence of Spontaneous Magnetization
(Vliyaniye strukturnykh o9obennostey ferrimagnetikov na tempera-
turnyy khod spontannoy namagnichennooti)
PERIODICALt Izvestiya AN SSSR Seriya Fizicheskaya, 1957, Vol. 21, Ur 8,
PP. 1038 - 1046 (USSR)
ABSTRACT: It is maintained in this paper, that at present no systematic
experimental data on the effects produced by atrvDtural 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 Forrer, which consists
in the extrapolation of the curves H(T) 0-- const of spontaneous
magnetization for different intensities of magnetization to the
value H - 0, and 2.) the method of thermodynamic coefficients,
6-3 . H ( C-de-
according to the thermodynamic equation d.(Y+
Card 1/3 t~
noting the specific magnetization, Cilck ermodynamic co-

4e-8-1/29
Effects of Structural Properties of Ferromagnetica ox: t',_s tempera-
ture Dependence of Spontaneous Magnetization
efficienta.). Three examples of alloys are considered in the
papert Ni-Cu, 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 magnetization, as well as the
thermodynamic coefficients W , 8 are very sensitive to varia-
tions of the concentration of the components in the vicinity
of the Curie point. A quantitative comparivon of the values cf
the coefficients of such alloys with a varying copper content is
only possible after a prolonged annealing (50 hrs). A comparison
of the coefficients (Y ) for nickel and nickel-copper alloys
allowed, that the value of f decreases with an increasing cop-
per content in the alloy. According to the theory by Vonsovskiy
and Vlasov in the case of Ni-Cu alloys the.,gradient of the
straight line ( 0- / 01 )4 (T/G) decreases with the decrease of
8 0
the exchange-interaction (s-d). In the second case of the Ri Hn
compound the author is lead to the conclusion, that the "taiisil
of the curves of apontaneous magnetization d.0 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 the third case of the Ni-Fe invar alloy magnetic ano-

48-8-1/25
Effects of Structural Properties of Ferromagnetica on the Tempera-
ture Dependence of Spontaneous Magnetization
malies are mentioned. The temperature deperdence of spontaneous
magnetization near Curie point is here 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 temperaturB interval. As a possible source of
this phenomenon it is considered, 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
transformation. Tlaere are 13 figures, 2 tables and 12 references,
8 of which are Slavic.
ASSOCIATIONs Dept. of Physics, of the Moscow State Universtty imeni M.V. Lomo-
nosov (Fizicheskiy fakuftet Moskovsko.-o gos. universiteta im.
M.V. Lonionosova)
AVAILABLEt Library of Congress
Card 3/3

)
. "Magnetization of Ferromagnetics Near the Curie Point," Moscow., 1958. (Dissertation
-I presented and approved for the degree of Cand. Chem. Sci.) Moscow State Univ.
im M. V. Lomonosov.

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~.1110 " kv
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~32V
AUTHORS: Goryaga, A. N.v Koroleva, L. I. SOV/55-59
3/32

TITLE: The Electric and Galvanomagnetic Propertieg of Nickel - Zinc
Ferrite
PERIODICAL: Vestnik JJqpkovs~_pW unjv2Wtgta. Seriya matematiki~ mekhaniki,
astronomii, fizikiq khimiij 1959, Nr 39 PP 97 - 104 (USSR).
ABSTRACT: It was the aim of the present paper to investigate the electric
and galvanomagnetic properties of nickel-zinc ferrite, which,.
according to data published in recent literature, has the high-
est magnetic permeability and the highest dielectric constant.
The ferrite sample of the composition 14.5% NiO, 36% zno,
(in mol percents) was produced according to the
0
49.5% Fe 2
1
3
0
usual ceramic process at the sintering temperature of 1320
(5 hours). The contactswere groduced by burning-in a silver
pasto into the sample at 500 , as-well as by dusting on to the
cathode and by rubbing on of graphite. Burning-in of the silver
past'e'does not essentially distort the results obtained by mea--
a.uring the electric resistivity of the ferrite. The resistivity
Card 1/4 could immediately be determined on the oube-shaped sample. The~~

The Electric and Galvanogagnedc Properties of Nickel
Zinc Ferrite
68045
SOV/55-T59-3-13/32
electria.resistivity ofthe ferrite depends essentially on the
amperage of the current passing through the sample. The r-agne-
'tiza.tion of the nickel-zinc ferrite was measured at various
temperatures by the ponderomotoric method. The sample under in-
vestigation has a negative sign of the thermoelectromotive force,
i.e., an n-type conductivity. The specific resistivity was in- 0
vestigated in the intervalranging from room temperature to 500
The curve lgQ - f(I/T) has four straight-lined regions and three
breaks. The first break point corresponds to the Curie tempera-
ture of 00-50o which agrees with the experimental work by
V. V. Komar and V. V. Klyushin (Ref 2). Next, the theoretical
calculations by P. P. Irkhin and Ye. A. Turov (Ref 4) are men-
tioned. The result of the present paper corresponds to the quan-
tum-mechanical theory of the last-named authors. The nature of
the two other break points is, as yet, not clear. According to
the results given, the electric resistivity of a nickei-zino
ferrite probably has a more complicated character than the usual
semiconductors. The transversal and the longitudinal galvano-
magnetic effect have the same (negative) sign and also approxi-
Card 2/4 mately tho game values. Both at room temperature and at higher

68o45
The Electric and Galvanomagnetic Properties of Nickel - SOV/55-59-3-13/32
Zinc Ferrite
temperature .a AQ/Q is caused nearly exclusively by the par&-
process (by true magnetization). For all field strengthey the
galvanomagnetic effect has a highly blurred maximum in the tem-
perature interval of from 60 to 650. The result obt 'ained by the
present paper agrees with that obtained by K. P. Belov and
Ye. V. Talalayeva. (Ref 5) as concerning th6 temperature do-
pendenoe of the galvanomagnetic effect in polyorystalline and
monoorystalline samples of manganese ferrites. In the case of
the ferrite under investigation (as well as-in the case of ferro-
magnetic metals and alloys) the galvanomagnetic effect is
2 _ 2
linear function of magnetization: C(d dS. ),.. wh4re-..d a
denotes.spontaneous magnetization. Spontaneous magnetization de-
creases sharply with increasing temperature. In the case of.the
ferrite under investigation, the influence 'exerted by the in-
homogeneous composition of the sample upon magnetic transforma-
tion is probably considerable, In metallic fe--romagfieti.es and
also in a ferrite in the immediate vicinity Of t Curie point,
The authors
the galvauomagnetic affect is proportional to
Card 3/4

68045
The Electric and Galvanomagnotic Properties of Nickel - BOV/55-59-3-13/3?
Zinc Ferrite
thazik:Profeiaor K. P. Belov for his-useful advice6 There are
.8 figut'ep.and 7 references~ 6 of which ere Soviet.-
ASSOCI&ION; Kafedri"oVshchey.fiziki dlya biologo-pochvennigo fakullteta
(Ghai~ ~bf-'Gsneral Physics for.the Biologg and Soil Department)
'SUBMITTED: ~~J&''nu'rY .1959
Card 4A
f-w*'t im 0-1 ~i:i

85703
5/056/60/038/006/046/049/XX
014A00 002-rd"31119111) B006/BO70
AUTHORS: Belov, K. P.,,Goryagaq A. N... Lin' Chzhan-da
TITLE: EleotricalTaZnd Galvanom.'agnetic Pro2ertiesyof Lithium
Ferrite flRromita=n the Vicinity of the Compensation Point
_Y1
PERIODICAL: Zhurnal eksperimentallnoy i teoreticheskoy fiziki, 1960,
Vol- 38, No. 6j pp. 1914 - 1915
TEXT: Some ferrites showing a compensation point (9 k) (in whieh the mag-
netic moments of the.sub-lattices are in equilibrium) exhibit strongly
anomalous temperature dependence of the spontaneous magnetization, and
the magnetostrictive properties above and below 0 k are largely different.
In gadolynium ferrite garnetv for example, they are determined below Ok
essentially by the gadolynium sub,-lattice, and above Ok by the iron sub.-
lattice. Further studies of the role of sub-lattices in ferrimagnetism
are communicated in this "Letter to the Editor". Electrical and galvano-
magnetic,effects in lithium ferrite ch-romite with a compensation point
Card 1/3

857031
Electrical and Galvanomagnetic Properties S/056/60/038/006/046/049/XX
of Lithium Ferrite Chromite in the B006/BO70
Vicinity of the Compensation Point
were measured. Fig.1 shows the temperature dependence of the longitudinal
galvanomagnetic effect for dLfferent magnstio. field at-rengthe for
Li 20*2.5Fe 203-2-5Cr2o 3' The -temperature dependence of the re-
sistance was measured for tho same ferrite. Fig.2 shows logR.f(I/T) for
d.c. (curve 1) and a.c. (200 ko/sec) curve 2). The temperature dependence
of magnetization at H-25000-is also plotted. The behavior of the indivl-.
dual curves is discussed. The bend of the curves at Ok is to be attr'ibut-
ed, according to Ye. A. Turoy. and Yu. P. Irk4.1.n, to the compensation of
the volume fields of the magnetic sub-lattices at Ok. There ate 2 fig-,
ures and 5 references: 2 Soviet, 2 Frenchv and 1 Belgian.
ASSOCIATION: Moskovskiy goeudarstyennyy universitet (Mos.~Ow state
University)
SV13MITTED: March 29~ ig6o
Card 2/3

S/126/61/012/003/019/021
E073/E335
AUTHORS: Goryaga, A.N. , 'Levitin,,,,.R.Z- and Lin Cbang-ta
TITLE- Anomaly of the Young modulus and internal friction in
ferrites with a compensation point
PERIODICAL: Fizika metallov i metallovedeniye. v. 12, -
no. 3, 1961, 458 - 46o
TEXT: The authors studied the dependence of the Young
modulus and of the internal friction of two ferrites of the
following compositions: Li20.2-7Fe2o~-2.3Cr2o 3 (with the
compensation point Sk = 371.5 OK) and Li20-2-5Fe2o~ 2-5Cr 203
(/"h = 326 OK). The Yound modulus E and the internal fricticn
Q71 were measured by a method described by I.R. Zacharias
(Ref. 9 - Phys. Rev., 1933, 44, 1j.6), using a freqto-,ncy of
130 kc/s. Fig. la show the temperature dependence of the Young
modulus E, dyne/cm 2 x 10-11 in the-demagnetized state,
:L.e, for H = 0 and at saturation, i.e. H = 2 690 Oe. It can
be seen that,at the compensation point,the Young modulus
Card 1/ ~j

S/126/61/012/003/019/021
Anomaly of the .... E073/E335
decreases and this phenomenon is particularly pronounced
if an electric field (H = 2 690 Oe) is applied. The maximun.
o f internal kriction occurs at the same,temperature buL its
magnitude is almost independent of the field (Fig. Is , shcws
the i-iternaX friction Q_ I versus temperature, OK). The
temperature dependence of the & E effect in a saturation
field of the same ferrite is shown in Fig. 2. This effect
decreases at the compensation point, which is obviously
associated with a reductIon in the role of the processes of
technical magnetization on approaching the compensation tempera-
ture. The fact that the AE effect differs from 0 at /~'
\:Yk
is attributed to the incomplete compensation of the spontaneous
magnetization of the sub-lattices. Similar temperature
dependences of E, Q-1 and of the j8E effect Avere also
obtained for the ferrite of the composition LiH 20'2.5Fe2 0&-2.';Cr 2~-
The authors attribute the anomalies of the elastic properties
to the fact that,at the compensation temperature,the ferrite
Card 2/~3

S/126/61/012/003/019/021
'Anomaly of the E073/E335
becomes a compensated antiferromagnetic due to the magnetic
moments of the sub-latticea being compensated. It is pointed
out that at about 250 OK a maximum of internal Ifri ction is
observed. which ceases on applying *a field, indicating that this
maximum is associated with domain phenomena. Mcasurement of
the magnetization at various temperatures has shown that the
maximum occurs in a range of the steepest decrease of spontaneous
magnetization on approachingthe (Ljk point Acknowledgmento
are expressed to K.P. Belov for directing the work.
h re are 2 figures and 10 references: 5 Soviet-bloc and
T
F,
5 non-Sovi et -bloc The four latest English-languaoge references
itientioned are: Ref. 1 W. Gorter, Philips Res. Report 1954,
91 295; Ref. 6- I.S. Van Wieringen'- Phys. Rev., 1953: go, 488;
Ref- 7 - M.E. Fine Physt Rev., 1952, 87, 1143 and
R.of. 8 - R. Street, B. Levris Phil. Mag. , 1956, 1, 663.
ASSOCIATION: Mosk.ovskiy gosuniversitet im. M.V. Lomonosova
(Moscow, State University im. M.V. Lorionosov)
~SUBMITTFW*' March .13, 1961
Card

221-7
8/056J61/040/003/007/031
91 //A~ 114 -1) B102/B202
AUTHORSt Belovj X.P.) Goryagal L.N.t Ling Chang-ta
TITLEs Galvanomagnetic properties of lithium ferrite chromite
PERIODICALs Zhurnal eksperimentaltnoy i teoreticheskoy fizikip
v. 40, no. 3, 19619 752 - 756
TEXTt The study o-L ferrites having a compensation point 9 0 (temperature
at which the magnetic moments of the sublattices compensate each other)
i:Pof eat importance to the theory of ferromagnetism. In a previous
p er rzhETFj L8f 1914v 1960)v the authors already pointed out that
L~ J*2.5Fe 20 2' 2.5Cr203shows an extraordinary longitudinal galranocaagnetic
effect (near 9 0 the sign of this effect changes from - to +). The au-
thors describe the studies of the even galvanomagnetic, effectB (ion itu-
dinal and transverse) in ceramio Li 20*2-7 P6202. 2.3 Cr203 (A). (L1 V&S
first heated on air for 4 hours at 1000 0C, subsequently it was sintered
at 1200'C for three hours (on air), and then slow1v cocied down. The gal-
Card '116- ~;

22127
S/056/61/040/003/007/031
Galvanomagnetic properties of ... B102/B202
vanomagnetic effect was measured in a solenoid (up to 2000 oe) and bet-
ween th oles of an electromagnet (up to 12pOOO oe)l the effect
(r =ZAR~R~ was determined by comparison with the standard resistors.
Magnetization I was determined in a solenoid by a ballistic method. r
and I were measured in the range of from room temperature to 300 0C. The
temperature was measured by means of a copper-constantan thermocouple
which was connected to a highly resistive potentiometer of the type
WnTS-1 (PPTV-1 ). The 'results are graphically illustrated. Pig. 1 showe
the galvanomagnetic effects r, and r,, as well as I as temperature func-
tions at H - 1550 oe and H . 1660 oet respectively. The compensation
point (incomplete compensation occurs) was at 980C. Figs. 2 and 3 illu-
strate r1l(t) and r.L(t) at high field strengths. The anomalies which be-
come manifest in these curves can be explained by assuming that tote sub-
lattices of the ferrite concerned have "own" galvanomagnetic properticz.
with different character. According to E.W. Gorter (Philips Res. Re-
ports, 9f 295p 1954) (A) has two sublattices, the first one being formed
mainly from Pe, Cr, and Li ions which occur in octahedral sites, the se-
cond one by Fe and Li ions in octahedral sites. Below 0 the octahedral
0
Card 2/16-

22127
S/056/61/040/003/007/031
Galvanomagnetic properties of B102/B202
;sublattice.is responsible of anomalies. The simple ferrite Li 0-5Pe 0
2 2 31
shows'normal galvanomagnetic properties. A comparison of the effects
W and r, showed. thIe followingt With T ~ 9 rj>) r,,j and both are nega-
...tive. In the.range T >Q, r becomes positivep the point r,, - 0 need not
o
coincide with 0'.0 In the range of the Curie point, the negative maxi-
mum of the galvanomagnetic paraprocess is somewhat greater for r.L. than
for rv. This is due to the fact that the difference between rj. and r,,
does not completely-disappear at the Curie point. The experimental re-
sults prove tha e de
t in (A) sublattices exist with different temperatur
of spontaneous magnetisation. There are 5.figures and 3 re-
ferences: 2 Soviet-bloc and 1 non-SoViet-bloo.
ASSOCIATIONt Moskovskiy Rosudarstvennyy universitat

28750
S/05 61/041/003/003/020
B125YB102
AUTHORS: Goryagag A. N.p Lin Chang-ta
TITLE: Low-temperature magnetic anomalies in lithium chromite
ferrites
PERIODICAL3 Zhurnal eksperimentallnoy i teoreticheskoy fiziki, v. 41,
no- 3(9), ig6it 696 - 699
TEXT: The authors determined the temperature dependences of spontaneous
magnetizationg of the coercive force, of the magnetic susceptibility, and
of the electric resistivity in li-thium chromite ferrites possessing
compensation points of the magnetic moments of the sublattices. The low-
temperature anomalies, detected in these fbrrites, confirm the suppositlion
of K. P. Belov (ZhETF, ~Ut 3, 692).. The measurements were made at Td_Q k
with the fullowing ceramically produced ferrites:
Li O-3Fe 0 2 Cr 0 (Q - 523.5 OK), Li Oe2-5Fe 0 .2-5Cr 0 (Q - 3260K), and
2 2 3* ~ 2 3 k 2 2 3 2 3 k
Li 2005Fe203(without a compensation point). The magnetization 6, , the
Card 1/4

2P50
B/056/61/04-1/003/003/020
Low-temperature magnetic*#* B125/B102
magnetic susceptibility X in a magnetic field of R - 10 oersteds and the
coercive force R0 were measured in a solenoid by means of the ballistio
methodtwheressa Wheatstone bridge was used to measure the electric resistaws,
In ferritest possessing a compensation point, the temperature dependence of
the spontaneous magnetization 0' a exhibits a clear break at liquid-nitrogen
temperature. At the same temperature, the temperature dependences of R 0 and
/1_ exhibit minima and maxima, respectively. Up to the temperature range of
liquid nitrogen, the magnetization S'c of tho first two ferrites mentioned
above depends only slightly on temperature. However, it hat a break when
temperature rises further and decreases until the compensation temperature
is reached. At this breakf the susceptibility has a maximum and the
coerci:Ve force a minimur. An increase in temperature after this minimum
causes a sharp increase of the coercive force. The temperature dependenceB
of any composition of the lithium ohromite ferrites behave in an analogous
way. If there is no compensation point, the curves6' s(T), H0(T) and k(T.)
have no low-temperature anomalies. The following holds for lithium chromite
Card 2/4

28750
9/05 61/041/003/003/020
Y
B102
Lovi-temperature magnetic*oo B125
f(1/T) curve has
ferrites possessing a compensation point Oks the ljog R
re functions G-~q 'r;
a break at temperatures at which the temperatu

singularities. These-anomalies as well, as the anomaly of the temperature
dependence of R is similar to the anomaly of ferromagnetics near th* Curie
point. The low-tempbrature anomalies in the temperature depender-:,,a of the
in the magneti,
magnetic and electric properties-are due to a sharp change c .
_7
5
long-range order of the ferrites. According to K. P. Belov a change of -
this kind in ferrites, possessing compensation points, must 6ccur in the
sublattice with the "weak" exchange interaction. The "weak" sublattice of
the lithium chromite ferrites ie octahedral. The exchange interaction in
the tetrahedral sublattice is stronger. The temperature dependence of the
spontaneous magnetization of the sublattice with weak interaction may be
blurred. The long-range magnetic order does not vanish completely from the
weak sublattice, owing to the effect of the negative exchange interaction.
between the eublattices. The temperature dependences of the spontaneous
magnetization of each sublattice and of the ferrite as a whole are
schematically rendered in Fig- 5- The dashed curve (T) for the octahedral

Card 3/4

28750 B/056-/61/041/003/003/020
Low-temperature magneticsoo B125/B102
sublattice is blurred because of'the effect of the antiferromagnetic
interactions Professor K. P. Belov is thanked for his advice. There are.
5 figures'and 3 Soviet references.
ASSOCIATIONt Moskovskiy gosudarstvennyy universitet (Moscow State Universi-
ty)
SUBMITTED: April. 69 1961
Legend to Figs 5: 0 compensation pointp 9
k - H -
temperature inducing a considerable change of
the long-range magnetic*o:rder. -
(1) Octahedral, (2) total, (3) tetrahedral.
Card 4/4

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an
A 17. Vol-kova N, V,
Bel-ov, K, ?,: rorynga
im --r-, Anomaly of e-lectric resistivity in the region of the compensation temper-
in 'inc ferrite NiFe
1.26vo.7404
4&1
-