SUPERCONDUCTIVITY OF BINA

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP82-00039R000100030026-0
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 3
• Document Creation Date: December 22, 2016
• Document Release Date: June 1, 2012
• Sequence Number: 26
• Content Type: REPORT

Declassified in Part - Sanitized Copy Approved for Release 2012/06/01 : CIA-RDP82-00039R000100030026-0
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6U PERONtJOTXV N
Letter to the Editor
(J.Exp.Thaor.Phye.U98R)i9r671-2,'t949?
N.E. A1ekae~Vfl14i
3-~-wse-repert~b~r-euinua]~---,- superconductivity was dis-
covered in a number of alloye of bismuth with r~on-superoonduoting
metals. `Another euperaondueting bismuth alloy has'.* been found;
hold ,; u!c ~ ,
4h;s--'eIII a bismuth-aocllum alloy of aomgauitlon 81Ns.
Ni
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II
Ja el
f- this a11ay we-txee~- "Jars/
B~ x
;gL
p
Y
EZw matcrial for epa~
rEZw materials for repay
_ _
A~ah" Di and "Merck" Na ~ alloy was Preparedjustaerbafare
ailov waenmade un Trom ^urixrin ratiivcx DJ. wlu
1
re ~ 1 0
gave the ?ame
Na which
Merck
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\by fueitin a eoa7.ea-Off quartz ampule ~~Y ~-nealing.
l~
~e final samples the annealing for two days at
400 C. 4etcrminptrion euperaonductivity was_-&o~s-by measuring
botk-b~he'eSietanae and magnetic moment,' the speaimen'.~
resietanoe wae~~-ade'-eri a fragment of the alloy
.._ e,s~.w~g. out off from the large cylindrical bar $ x 20 mm in size
which was used to measure k-maiotio moment. The alloy sample
used to measure magnetic moment was given the form of an ellipsoid,
after which it was very carefully etched to remove any possible
eurfaoe ferromagnetic impurities. Since t~e alloy reaa~te oativoly
with water, #. the sample was d~a in pure' water.
After a sufficient quantity of the sample had disaolved,'the sam-
ple was repeatedly rinsed in`alcohol^ dried and immediately put
k.i ,
into the apparatus, which -Ye evacuated and filled with gaseous
helium to prevent ixiteraation with atmospheric moisture.
50X1 -HUM
r r w rr w rrrw ~.wa=rri==.-i . wr=r rw=ww=w=.wi==r==.w.rir=== r wrrr rrrrrwrrww wr
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Declassified in Part - Sanitized Copy Approved for Release 2012/06/01 : CIA-RDP82-00039R000100030026-0
 Declassified in Part - Sanitized Copy Approved for Release 2012/06/01 : CIA-RDP82-00039R000100030026-0
Declassified in Part - Sanitized Copy Approved for Release 2012/06/01 : CIA-RDP82-00039R000100030026-0
J
ssmpl~_~+~~ ~ eon~iaer~'~ld
UnFortun~tely the
Qal1B6Cl hY6ti6Y'
?
' tlria t 8
~~~? The resistance curve _
ourvO ghowi g magnetio moment -oe- ~xternal t'idld ~
oritioal
S1t4#44drY\s A ,~i.~ l.? cw~Wt o f __
field. ~ ternperatur~. The critical fi~1~L values for thin graph
axe ~~~_~~m the magne tio-moment m~aeurement.~2 _
o -to c~
`thy tran~ibion t~mporatu ~
this ourvo 2.25 K.
transition tcmporature
The somowhat lower ~btain~d-~s'~~ 1 --
iot~nc~ aurvC iR probablY oxpla ne
from the rr~a
inhomogene1.tY of t~u4aample used for~resioto,nae d~termin
mr,p value for dH?/dT ie ~-pPrnximatoly 100 gau~g/degree.
atit~r
It
ehoulr~ be noted,uhowcv~r, that the vaiuo c1H0/3T obtained from
v
the resistance measurements is considerably higher and com ~~ to
250 gauss/degree. It ie probable that this diffErenae is &-CJ11"'
.cjue!ree-e+lr' insufficiont homogeneity of the alloy.
Institute off sciiC1 enceerofl~h~ USSR. ReociVe by ~ P~I~raha h94gditor
Academy o
 Declassified in Part - Sanitized Copy Approved for Release 2012/06/01 : CIA-RDP82-00039R000100030026-0
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Declassified in Part - Sanitized Copy Approved for Release 2012/06/01 : CIA-RDP82-00039R000100030026-0