SCIENTIFIC ABSTRACT LAVRENTYEV, V.V. - LAVRENTYEVA, L.G.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R000928820009-3
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 100
• Document Creation Date: November 2, 2016
• Document Release Date: June 20, 2000
• Sequence Number: 9
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

SOV/24-58-9-22/31
AUTHORS: Bartenev, G.M. and Lavrentlyev, V.V. (Moscow)
TITIR: The Law of Frictio'n--fOM-H-i~ ~Materials
(0 zakone treniya vysokoelastich~eskikh materialov)
PERIODICAL: Izvestiya Akademii Nauk SSSR Otdeleniye Tekhnicheskikh
Nauk, 1958, Nr 9, pp 126 - 1~9 (USSR)
ABSTRACT: The paper is a continuation of Bartenev's previous work
(Refs 1, 6, 7). In addition to this work, the results
of Harry and Prock (Ref 2), Thirion (Ref 3), Denny (Ref 4)
and Schallamach (Ref 5) are reviewed, with special
reference to the law connecting u , the friction
coefficient of rubber on a smooth-surface (for example"
polished steel), with P , the normal load, so , the
nominal area of contact and S" , the actual residual
0
area of contact as p40 , where p = P/S' The
relationship proposed earlier by Bartenev (Ref 6):
1 + up
(4)
11 C a + S11/svp
0
where a. is a constant depending on the elasticity
Gardl/2 modulus of the rubber and C is a constant depending on
the experimental conditions, is shown to reduce in special

SOV/24-58-9--22/31
-The Law of Friction for Highly Elastic Materials
cases to the formulae used by some of the above workers.
Experiments were carried out on SKN-18 Eubber (Shore
hardness 68) on aluminium at 23 and 65 C and with two
samples of SKN-26 rubber (ShoFe hardness 56 and 45,
respectively) on steel at 23 C. The values of c, a
and Sit are tabulated for the four sets of experimentsi
0 ii = BV_ 113
Schallamach's formula; does not fit the
experimental data. The difference between initial fr.-L~ction
and friction with steady slip is also discussed. There are
5 figures, 1 table and 8 references, 4 of which are Soviet
and 4 English.
ASSOCIATION: Institut rezinovoy promyshlennost.:,. Pedagogicheskiy
institut im. Potemkina (Rubber Industry Institute.
Pedagogical Institute im. Potemkin)
SUBMITTED: November 18, 1957
Card 2/2

81607
S11901601002102106101l
B004/BO61
1-1 -?000
AUTHORS: Bar-tenev, G. M., L
,Avrentizveyp V. V.
TITLE: The Nature of "Static" Friction in Rubber-like Polymers
PMIODICAL: Vysokomolekulyarnyye soyedineniya, 1960, Vol. 2, No. 2,
pp. 238-242
TEXT: After measurements with a pendulum tribometer, the latter author
came to the conclusion that static friction exist's in rubber as in
solid bodies (Ref. 10). But later tests showed (Fig. 1) that this method
was not accurate enough to determine static friction in highly elastic
materials. The initial friction is greatly influenced by the duration
of the previous contact between rubber and steel. Thereforeg a contact
time of exactly three minutes was maintained in the following experiments
carried out with a tribometer from the Institut rezinovoy promyshlennosti
(Institute of the Rubber Industry). When a tangential force is applied
o 9
TY-sample, it not only slides, but an elastic, reversible deformation
t
also occurs, whose magnitude depends on the thickness of the sample
Card 1/2

The Nature of "Static" Friction in
Rubber-like Polymers
82607
S11901601002102106101l
B004/Bo6i
(Fig- 3). Fig. 2 shows that the results were affected by the hardness
of the dynAmometero The values are only conditional as they depend on the
accuracy of measurement of the sliding and on the velocity of the
tangential force applied. If, however, the rubber sample is firmly
attached to the base' the elastic deformation can be determined, and this
factor can be disregarded in the results (Fig. 4). Strictly speaking,
the rubber undergoes no static friction, but for practical purposes the
initial friction can conditionally be regarded as static friction. There
are 4 figures and 11 references: 4 Soviet, 4 US, 2 British, and 1 German.
ASSOCIATION: Moskovskiy pedagogicheakiy institut im. Potemkina
(Moscow Pedagogical Institute imeni Potemkin)
SUBMITTED: October 18, 1959
Card 2/02

AUTHORS:
TITLE:
PERIODICAL;
S/02 61/141/002/010/027
B104%138
Bartenev, G. M., and Lavrentlyev, V,, V.
Elastic contact friction between surfaces
Akademiya nauk SSSR. Doklady, v. 141, no. 2. 1961, 334-337
TEXT: In the case of elastic contact between two bodies,for each value of
the normal load N there is a fully defined corresponding area of effective
contact S. Strictly speaking this relation is only theoretical.
Nowadays it is assumed that for metals and rubber the relation F =cS holds
between the force of friction P and the area of effective contact 3, where
c is the specific frictional resistance. Fig. 1 represents the specific
friction between HK (NK) rubber and brass as a function of the normal
pressure applied. By applying higher pressures it can be seen that
is no longer dependent on pressure. This is important for friction
calculations for rubber under high loads. In the steady state the specific
load required to reach this limiting value is smaller than at the
beginning of the shear, due to.the fact that the actual area of contact
increases in the sliding process. If the loads exceed 250 kg/CM2 a
Card 1/* 7~

S/020/61/141/002/010/027
Elastic contact friction between surfaces B104/B138
constant specific friction is reached, provided the friction is steady.
In this case the contact surface S will also be constant. (f =S/S is
n n
introduced as the relative contact surface and it is suggested that when
the normal pressure is raised the rate of increase in q diminishes as the
proportion of the surface outside the contact diminishes (1 -if), as the
modulus of elasticity E of the rubber increases in uniaxial compression.
These propositions are described by the differential equation
dy= P(I -(f) ~2 . The solution obtained from this equation is
E
F=cS n -c(S -S 0) exp (-P/E).p, where S0 is the contact surface for p --),-0.
In a graph representing log(cs n- F) as a function of p, in accordance with
the above solution, the measured values shown in Fig. 2 plot almost
exactly in a straight line. AP =0.17 is obtained from the gradient of the
straight line. There are 3 figures and 11 references: 9 Soviet and
2 non-Soviet. The two references to English-language publications read as
follows: P. Thirion, Rubb. Chem. Techn 21~ 505 ('1948); J- Hurry,
J. Prock, India Rubber World, 128, 619 61953
Card 2/0

OV6111
Elastic contact friction between B104/B138
'ASSOCIATION: Moskovskiy gosudarntvennyy peda.-ogicheskiy institut im.
V. 1. Lenina (1,Toscow State Pedw;oEical Institute imeni
V. I. Lenin)
PRESENTED: July 1, 1961, by P. A. Rebinder, Academician..
SUBMITTED: June 27, 1961
Fig..I. Specific force of
friction,f = c,'as a function
20
of-the,pressure appliecl to
NK rubber in contact with
brass. J10 -
Legend. (1)_Initial friction; 6-
M L.-Kro,
(2) steady friction.
1w P
Card, 3/f.
, 0,~:
4 110021010102 7

IAVRENTSYEV, V.V.
Tribompter for measuring the friction power of low-modulus high-
molecular weight polymers. Kauch. i rez. 20 no.9:33 S 161.
(MIRA 15:2)
1. Moskovskiy Gosudarstvennyy pedagogicheskiy institut im.
V.I. Ienina.
(Macromolecular compounds)
(Tribometeris) '

39846
-/19 19710
0 - 04/008/004/016
M so B101YD180
J~UTHOR: Lavrentl~rev. V.
T112LE: Investijation of the true contact area of polymers
IUODIG.,L: Vysoko-,;olekulyarnyye soyedineniya, v.
PER 4,.no. 8, 1962, 1151-1154
TEXT. -..echauls opt *ical method was employed to measure the true'contact
area between polymers (rubber.or polyethylene) and smooth surfaces at'
0, 2
0 - 100 C and p *ressures up to 20 kg/cm . The method is based on the
interruption of-the total internal reflection of a light ray passing
t.hrou.~h a prism the lower face of which is in contact with the pol-Ymer
z:j=c1me 11
Results: (1) The true con-act area increa-ses with tempei-ature
and contact time. (2) Equations derived. earlier'.(Dokl. AIT S37c,"01, 1141, 334,
11061) for the exponential increase in contact area with rising normal
-were confirmed by the experiments. JIU -w sliding ratn~;
.dressure, (3) " lo - 0
(ujI to 0.1 ~I-Vsec) the tru,~ contact area is the same as when at rest. (41.
constant pressure the true'.oontact,area depends.on the geometry of the
s len. There are 4. figures. T
.paciL he En-lish-language reference is:
F. Bowden, D. Tabor, Friction and Lubrication of Solids, Oxford, 1950.
Card 1/2

S/19 62/004/008/004/016
Investigation of the true contact ... B101yZ180
ASSOCIATION: lloskovskiy gosudarstvannyy pedagogicbeskiy-inatitut ii,-).
V. I. Lenina (,!,,Ioscoiv -Stat-e Pedagogical, Institute imen.4
V. I. Lenin)
SUE'_,:ITTED MaY 4, 1961
Card 2/2

DYURICH., N.A.9 YELIKIN, A.YS... IAVMNTIYFV,- ~VV
Now apparatu.a and methods for determining the friction coefficient of polymerse
Report presented at the 13th Conference on bigh-molecular compounds.
Moscow,. B-11 Oct 62

J
I?I
I .I
.I
.1
. .i
I
. I
...I
_.:_ ~ 11
I
. .Ii
. . -i
. ,4
.I

L
ACCESSION AM, AT5022666
f oi- -a atr6sved naterial (B. A~ Dogadkinp G. H* Bartenev', and H. M.-Roznikovikiye
iyd ~v oblanti,v
Issle.dov" ysokoiaolekulyarnykh soyedinon1y. Trudy NIX",
-
6 skb1MWAt9 14,-Lo #1949) the-equation for the,friction force is found to be
0
linear 'Ath streses -
h
%
:(whore u friction Proceis'a6tivation energy; ea
b3 ~-absolute temperature; k
:Bolt7jan constant).:' Thin'-sheets-(150 x.50 mm):of a highiy elastic polymer I were
placed on imovable -table 2 (see Fig. I on the Enclosure), and a motai slider (or
sphore): 3 .10a'ded with 4 moved at'a.prascribod velocity on the ocim3n stressed
0 ring 5. It was
by load P- The friction force was recorded with a strain RagIR
n-force decreased linearly with stres
found thatt a) the*specific frictic s (0-100
2
kg/cz~ )., w4s 3.arger along the strous,direction'than d6ross, the difference botwoon!
the friction forces in orthogonal diractions,incroasod with increasing normal
.8 kg)~j aid the above derived oquation ums won-satisfiad oXCODt for
-load (0.2-0
very small stroasos;,b) the poofficiont of friction for rimooth surfacos chang
,od
ido ,/cm2) '
cons rally vhei'~ the norma, load ~w changod (0.2-0.8 1;P b,'~t romaixiod almost!
Card 2

AM
'L.WSO-66 EWT(M)l
EPF(V)1EWP(j
Wr W
AC=ION NR: .-APS023213 UR/0374/65/000/004/6123/0129
678.531,44
'.-..-'--;AU.THOR:: Bartenev G. M. -(Moscow); jdm~wu!rj _4oscow); Konstantinova, N. I
A . - - -
71"
(M cow)
"TITLE. Effect of.normal load on temperature and slip rate.dependence of frictions
f6rce:of higbly~ela'stic materials
SOURCE: Mekhanika polimerov, no. 40. .196,59 123-129
TOPIC- TAGS: synthetic rubberg friction, internal friction, friction coefficient,
ynth6tic material, vulcanizAtiofi,
copolymer, ~ q
The iaffect.-of normal,load. on temperature and slip rate dependence
)ss-linked ry on r e
ptional~ force of erm butadiene-ac 1 it i1 ea
_R2bTers (rubbers
on SKNI18% SKN-260.and SKNe-40) ~Ibn polished steel was investigated. Th-e-o-Fiect of
this study- was to amplify the knowledge on performance of these highly elastic rUb_f_:__
bers specifically, to extend Itto high normal loads*. This study was, also OX-
yl Id more . u ar-
Peduld to- 0 _,4derstanding of the. molecul kinetic nature of the internal
C range.,the.frictional'iorce of vulcanized
ion In Pbly-mers.15 in the -I6-1000
rubbers -is Inversely roportional to temperature. . 7 n/02 th effect of
to 10 -0
fl-L't-",tart- 1/2

-9607-66
ACC NRi AP6003948 SO!JRCE CODE: UR/0374/65/000/005101'48/0134.,/,,'i
AUTHOR: Shlenskiv. 0. F. (Moskva); Khovanskaya, N. N, (Moskva); Lavrent'vey, V. V.
(Moskva)
ORG: none
TITLE: Method for comprehensive study of the mechanical properties of polVmer films
SOURCE: Mekhanika, polimerov, no. 5, 1965, 128-134
TOPIC TAGS: polymer, polyethylene plastic, photographic film, anisotropic medium,
time, temperature dependence, poisson effect
ABSTRACT: Testers for determining the coefficients of lateral contraction of aniso-
tropic film materials depending on the time and temperature are described. The test
results of the polyetheline films are reported. Orig. art. has: 9 figures, 4 for-
mulas, and 1 table. [Based on author's abstract]
SUB CODE: 11 SUBM DATE: IIJan65/ ORIG REP: 002/ OTH REP: 002/ ATT) 11PESS:
UDC: 678:620.17

L ~41187-66 EWT(m)/r/Ew wp (j IJP(c) MV/RM/J1D
(V)/F
ACC NR, Ap6o234% . SOURMCODE: UR/0190/66/008/007/1247/1251
AUTHOR: Korewskaya, N. S.; Lavrentf YGvp V. V.; Yamatinskaya, S. M. Rayevskiy,
:.s~U, _: .... ~'=,: _.." --
G_-; M~_ - -
pt 5, S.
ORG: 2nd Moscow State i-j9dical Institut
0 (2-Y 140skovskiy gosudarstvenrWyyinstitut);
*ne tre-chnolo L, 21, .,
Moscow Institute of 1i _C~Wni6al' 97 im 1-1 V Lomonosoy .(Moskovskiy institut
tonkoy khimicheskoy tekhnologii) '
TITLE; Effect of degree of contact on the strength of adhesive bonds between an
elastomerjand a solid substrate
SOURCE: Vysokomolekulyarnyye soyedineniya, V. 8. no. 7, 1966, 1247-1251
TOPIC TAGS: elastomer, adhesive bonding
ABSTRACT: An optical method was used to study the effect of the conditions/under
which elastomer - solid substrate and elastomer - elastomer adhesive bonds\Zre formed
on the strength of the/bonds and the degrp of the contact beEw_66_n__iW6i1~rTand sub-
strate. The adhesivel9enployed was SKN-Wbutadiene-acrylonitrile copolymer, and the 1
_~_a~t_eprepared from a mixture of -channel-black pow-~-
substrate was a polished part of a
der and polyvinyl alcohol binder.'~~ The optical instmnent used for determining the
area of actual contact is e~'c_rfbad. Zia effect of Dressure and duration of
the con-
tact on the extent of the adhesive - subs-lurate conta~A- was determined. It is shown
that in both types of adhesive bonds studied, the, increase of adhesive strength with

ACC NRi AP6023431
I of corl-
,the observation time continues even after the equilibriiLm value of the degree
tact has been established. It is postulated that the discrepancies observed betwoon
the course of the kinetic relationshi-Ds and the strength of the self-adhesive elasto-
mer - elastomer bond is due to volwaa diffusion processes, and in the case of the ad-
hesive elastomer - solid substrate bond, to microrheological processes and surface
diffusion. Authors thank V. F. Mal'tsey for carrying out a part of the work at the
colloid chemistry department of.MUMT im. N. V. Iomonosov. Orig. art. has: 5 fig
ures.
SUB CODP-,: II/ SUIR4 DAT-7: 23Jun65/ ORIG REF: 007/ OTH REF: 001
Card 212/~'-' 1`_

J~ACC'NRC`AP60~6~53 SOURCE CODE: UR/0138166/ooo/oil/0022/0025
AuMoi: Iavrentlyev. V. V.; Shlenskiyp 0. F.
ORG: Donartment of a-porimontal and ?noorotical Physics, Second Moscow State Modical!
Institute im. N. 1. Pirogov (Kafodra oksporimontallnoy i teoreticheskoy fiziki, 2-y I
'Maskovskiy Gosudarstvannyy zoditsinskiy institut)
TITLE: Mothod of determining the mechanical characteristics of highly elastic
materials under complex stress
SOURCE: Kauchuk i rezina, no. 11, 1966, 22-25
TOPIC TAGS; elastic deformation, complex stress, shell deformation
ABSTRACT: A method has been developed for calculating stresses and relative strains
in a specimen in a two-dimensional stressed state. The necessary relationships are
derived by considering a shell into which is converted a specimen exposed to the
action of air pressure. The behavior of the surface of a shell of SKS-30 rubber film
I = thick was photographed. Formulas are derived for the maximum tension in the
specimen. The whole process of deformation of the specimen is divided into two
periods; a correlation exists between the uniaxial and biaxial stressed states in the
first and second periods of tension. Therefore, using the darived relationships for
the biaxial stressed statej, one can determine the characteristics of the specimen
under uniaxial deformation. Results of the study made it possible to construct an
Cord-i/2 UDCs 678.4t62o.172.2

f--ACC-N-R -%AP6()3 63 53
instrumen't for testing epecimens under'complex stress* Origo,art. hasi 4figures,,
-1 table and 16 formulas.
SUB CODE: 20/. SUBM DATEs 16yar65/ ORIG REPI -003/ '0TH REFt - 001

DOROGOGRINSKIY., A.Z.; NAKHAPETYAN, L.A.; ~AVRENT'Ut, V.Y.; BOYKOVA, Ye.P.;
KOST, A.N.; YERSHOV, V.V.
Antioxidant properties of some derivatives of pyrazoline. Izv.
vyo.uchebe'zave; neftli gaz 3 noo3:69-71 60. (MIRA 14;10)
1. lbskovskiy gosudarstvennyy universitet imeni M.V.Lomonosova i
Groznenskiy mauchno-issledov4tel'skiy neftyanoy institut.
(Pyrazoline)

/62/000/008/004/004
S1119
D262/D308
iA~THOR: Lavrintlyev, Ye.A., Engineer-
%
TITLE: Wa-c-hines for fatigue testing of metals at.high tempe-
ratures
PERIODICAL: Pribo troyeniye, no. 8, 1962p. 29 - 30
roll
TEXT: The article describes two testing machines: MOT-3000- MIT
-3000) qnd YKr-3000 (UKT-3000), working on the following bases:
a) Constant moment created by the loadp acting on a rotating speci--.
men, and b) constant'moment created by the rotating field of forces,
acting on a stationary specimen. The machines permit testing cylin-
drical.specimens at alternating symmetrical loading cycle, with
stress changes forming a sinusoidal ourvep at a temperature range J
of 800 J~ 110000 and frequency of test load from 1000 to 6000 rpm.
The tech~aical details of the machines are described$ their basic
'working characteristics tabulated and7methods of operation explai-
ned# There are, 1 table and 2 figures.
Card 1/1

USHAKOVY S.N.; LAVRENr,YEY, Ye.m.; PODGORSKAYA, K.S.; PETROVA, L.I.
Synthesis of vinylpyrrolidinone and vinyl alcohol copolymers. Tlysokom.
soed. 6 no.8:3UO-I"l Ag '64- . (MIRA .17:20)
-1, Institut vysokomolekulyarnykh soyedineniy AN SSSR.

L k- N
USSR/Chemistry of High Molecular Substances. F
Abs Jour: Ref Zhur - Khimiya, iio. 8, 1957, 27090 D.
Author Lavrent'vev. Y&.M
Inst Institute of High Molecular Compounds of Academy
of Sciences of USSR.
Title Study of Reactions in Chains of Polyvinyl
Alcohol.
Orig-Pub: Avtoref. diss. kand. tekhn. n n-t vysekemele-
kul. soedineniy AN SSSR, L., i~51
6.
Abstract: .,%'0 abstract.
Card 1/1

S/007/6!/000/011/003/003
B107/B147
AUTHORS: Zhirov, K. K., Bandurkin, G. A., Lavrentlyev, Yu. G.
TITLE: Geochemistry of rare-earth elements in pegmatites of
Severnaya Kareliya
PERIODICAL: Geokhimiya, no, 11, 1961, 99-5 - 1004
TEXT: This paper presents data on the composition of rare earths in 41
samples of orthite. monazite, xenotime, uraninite, gummite, cyrtolite, and
garnet; furthermore, it deals with the influence of paragenesis and altera-
tion of a mineral on the composition of rare earths, The samples were
taken from pegmatites of the Belomorskiy archaic metamorphic complex,
Severnaya Kareliya~ According to K. A. Shurkin (Ref. 9: Tr. Lab, geologii
dokembriya, Izd-vo Ali SSSR, no, 9, 1960), this complex consists of the
following formations: 1) lower formation: leucocratic biotite gneisses
and granite gneisses, strongly metamorphized; 2) intermediate formation:
amphibole, amphibole-biotite, and biotite gneisses, amphibolites; 3) upper
formation: Disthene-garnet-biotite and garnet-biotite gneisses. The
following previous publications on the composition of rare earths in
Card 1/11~

S/007/61/000/O!1/003//C)03
Geochemistry of rare-earth elements ... B107/B147
minerals of Kareliya are referred to: S. A. Borovik (Ref, 10: Doki, k1i
SSSR, Ser. nov. 14, 351, 1937); V. N. Protopopov (Ref. 11: Materialy
TsNIGRI, Geokhimiya, sb. 5, 30, 1940); E. Ye~ Vaynshteyn, A. I.. Tugarinov,
N.,.V. Turanskaya (Ref. 12: Geokhimiya 2, 36, 1956); Ye, I, Semenov,
R. L. Barinskiy (Ref, 13: Geokhimiya, No, 4, 1958); V~ A. Leonova
Ref. 14: Zap.. Vses., mineralog., ob-va 88. No~ 1, 1959); and D. A, Mineyev
f. 15: Geokhimiya, No,. 2, 1960)~ I. B. Ivanov, Ye. V~ Kostetskaya,
t
and Ye, V. Bibikova took part in collecting samples for this study. The
analysis of rare earths was carried out at the radiochemical laboratory of
the Institut mineralogii, geokhimii i kristallokhimii redkikh elementov
(Institute of Mineralogy, Geochemistry, and Crystallochemistry of Rare
Elements) by the method of R- L.. Barinskiy (Ref. 16: Zavodsk~ laboratorAya
24, 613, 1958). The sensitivity for the individual elements is O'l ~0; the
accuracy for monazite, xenotime, orthite is T- 10 5, and for urani.nite
and gummite, 20 ~16. The values for odd-numbered elements are seiniquantita-
tive in the latter. Determination was carried out without previous enrich-
ment. Some yttrium determinations were carried out at the radiocherlical
laboratory of the Institut geologii rudnykh me3torozhdeniy, petrografiJ,
mineralogii i geokhimii (Institute of Geology of Mineral Deposits.
Card 2/-?,-,.
~y

S/007/61/000/011/003/003
Geochemistry of rare-earth elements ... B107/B147
Petrography and Geochemistry): focusing spectrometer of the type PGK -4
(RSK-4), sensitivity 0.0Z, accuracy 1C~/o. The authors thank R. L.
Barinskiy and K. I. Narbutt for the permission to work in their laborato-
ries and for help. Result (see Table 2): The composition of rare earths
in monazite and xenotime is virtually independent of paragenesis. It
varies, however, considerably in orthite and uraninite. Rare earths are
precipitatedlinthe following sequence: apatite, orthite. monazite,
(xenotime+cyrtolite+uraninite), carburan. In pegmatites with this
sequence, first yttrium oxides are fixed in apatite (Ye. V. Kostetskaya,
Ref . 23: Raspredeleniye redkikh zemel I v apatitakh nekotorykh pegmatitovylb
zhil Sev. Karelii. (Distribution of rare earths in the apatites of some
pegmatite veins in Severnaya Kareliya). Kafedra geokhimii Moskovskogo
gosudarstvennogo universiteta im. 14. V. Lomonosova (Department of Geo-
chemistry of bloscow State University imeni M. V. Lomonosov), 1958); then,
the cerium earths are precipitated in orthite and monazite, and, finally,
yttrium oxides in xenotime and in the other minerals mentioned.
Uraninites have a Gd - Dy - Er maximum. In pegmatites without apatite,
orthites are enriched with yttrium oxides. Uraninites have a Dy - Er - Yb
maximum. Accordingly, the composition depends on the presence of phos-
Card 3A41-

S/007/61/000/011/003/003
Geochemistry of rare-earth elements ... B107/B147
Dhate ions. In this connection it is assumed that rare earths are trans-
ported as pyrophosphate complex. The authors thank V. D, Nikitin,
P. P. Borovikov, and Yu. V. Hikitin for help in field work and material
selection. There are 3 figures, 2 tables,and 32 references: 27 Soviet
and 5 non-Soviet. The three most recent references to English-language
publications read as follows: E. W. Heinrich, R. A. Borup, A., A. levinson,
Geochim. et Cosmochim. Acta, 19, No. 3,1960; M. K. Carron, C. R. Naeser,
H. J. Rose, F. A. Hildebrand. U. S. Geol. Sur. Bull., No. 1036 - N, 1958;
C. Frondel. Am. Miner. 41, 7 - 81 539t 1956.
ASSOCIATION: Kafedra geokhimii Moskovskogo gosudarstvennogo universiteta
im. M. V. Lomonosova (Department of Geochemistry of Moscow
State University imeni M. V. Lomonosov)~ Institut geokhimii
Sibirskogo otdeleniya All SSSR (Institute of Geochemistry
of the Siberian Department of the AS USSR)
SUBIMITTED: April 1, 1961
Card 4/7-,

ACCESSION NOt AP4Oi3298
S/0032/64/030/0()2/0168/0169
+%M OR t lavrent',yev, Yu. G.
TITLEs. X ray spectrometric determination of small amounts of titanium in niobium
pentoxide
SOURCE: Zavodskaya, laboratoriyap v. 30, no. 2, 1964, 168-169
..-A-,c determination, titanium dioxide,
TOPIC TAGSt titanium, niobiump x ray speotrow,.-',-
nibbium pentoxidep x ray analysis# absorption line intensityl light filter
ABSTRACTt The determinations were conducted on a DRUS-2 x-ray spectrometer with a
quartz crystal. Niobium pentoxide samples were packed on a hydraulic preas into a
tte 20 mm in diameter and 1-2 mm deepy yielding- a solid smooth surfauee The
cave
X alpha, line of titanium, at lambda 5485-74XP was chosen as a lead. To eliminate
interference on the part of line NbL beta at lambda 5481-OXP a cellophane filter
between 20 and 40 microns thick was used to lower its intensity, The standards
were prepared by mixing the desired quantities of niobium pentoxide and titanium
dioxidep followed by dissolving in hydrofluoric acid and precipitation with ammonia
to prevent the particle size from affecting the intensity of the analytical line.
The author concedes that it is quite difficult to achieve a complete precipitation;
1/2
Card

ACCESSION NO, APPIV98 JI
of the dissolved mixt*re. The method was cheoked-against the chemical and spectral
teohniquesp and salkiefactor7 matching results were obtained. The minimum detectable
concentration of titanium Was 0.01%p and it is possible to run 10-15 determinations
in the course of a 5-bour working day, with a reproduoibi'Lity within a 6-7% range,
as against 8% for the-chemical method and 15-20% for the spectral analysis. Orig.
hass I~table aqdl chart,
ASSOCIATIONs none

1AVREWA-VA.A4,00; VAYNSHTFYN,, B.Ye.
--l-
Effect of an instrawntal error on the precision and ae-T-15itavity
of X-ray spectral analyBis. Report No.2. Zhljr. anal.~ khim. 20
no.10:1033-1037 165. (MIRA 18:11)
Is Inotitut gookbimli i analiticheekoy khimii imeni V.I. Vernadskogo
AN SSSR, Moskva.

volts~ Dee gae -50,ft; bigh-frequency'load, 600,Ailowatts; stability, 10 " (winding
ca. rating volta -3
(frequency, of 4e le .9a), and 10. Aits amplitude). Af-
defle
ter ction the beam is- directed into a~ commutating magnet by which the beam can,
three experimental z (1) hith-intensity
he'_-dir6cted against targets set-up in rOOMS
neit time-of ' igh rime 'and (III) nuclear precision spec-
beams, (11) MIn 41 texpe I nts,
troscopy with electromagnetic bonochronator., ~ Ion-roptical.,channeling, focusing and
Commutating of.the beam are done by,six*pairs of quadrupolar lenses- two identical
rotary- electromagnsts,-a monochromator.electromagnet, and two small electromagnets
f6r:;COrZ`6Cti1Dn 9f: the beam ~ in the vertical direction. The resonance, system is a
qiiirtei4~ve coaxial. line ending with- the -,180-degree DeeO . The resonant frequency
is:ieiet by remote displacemefit.ofa plate withoutdisrupting the vacuum. The fre-
qpency s established with an accuracy'of 5-18 kc.plus or minus. Smooth high-fre-
r's ifting regulation of frequency
qu1DDCYZOgulatidn is provided~by twa irimme :peM
has
to 2-4%.. The high-frequency oscillator acapacitaiive-connection with the reso.
*:nance systemp~: A connecting rod is.usedi.witbi)ut,,disrotion.,Of the vacuum,-to shift
the: Dee In -the vertical and horiz6ntal planes,.and also gong. its,own axis. The'
8 of two'-sect
accelsvitor~chavbbr consist ions: high-ve
acuum chainber.able to ex-
ha-ust, along, With the: resonant- ~Ilifii_%~'tbe: magaetk gap; anid-_ia fdre~-vacuum section
2/3

2828 Lavrent'Yev, Yu. L.
Vodnyl i Roleyoi rezhim pochv ohyglovannyl~h -achastlrov zqpadoi bu~rprfptoi
chant! dellty reld Vole M., 1954 19 a. 21 am. (Mosk. ordenA leninp ;ros.
un-t Im. M. 3. Lomono-ove). loo 7,1,cz. 13. Ts. -- OL'-.0186?)

VIADYCHEEPSKIYp S.A.; Prinimali uchastiye: Korenevakaya, V. Ye.; YEWLEVA, L.V.;
IXMNTIUW, Yu. L.; RODIONOVAi V.I.; KACHINSKIY, N.A., prof.
14oisture conditions of soils in the Volga-Akhtiflba Flood Plain
Ahd Delta. Vest.Mosk. un. Ser.6: Biol., pochv. 16 no.3:73-80
14y-Je 161. (14IRA 24: 6)
1. Kafedra fiziki i melioratsii pochv Moskovskogo gosudarstvennogo
universiteta.
Volga-Alchtuba Flood Plain--Soil moisture.)
lga Delta---Soil moisture)
t

LAVRENTIYEV Yu N
%-
On a continuous rail track. Put' i put. khoz. 8 no.708 164.
(MIR-A 17.-10)

KOMV) VOM05 LOMPI-EV. YU.N.
Cradk.in the rail. Put' i put.khozo 9 no.6.+2
(MJRA 18t6)

IAVMNTII-,,Vp Yu.N.
They missed the right time. put' i put. khoz. 9 no.11:44-45
165. (MIRA 18:11)

ILOMWO Y.M.; ZAVM'lWs, TUX
~7--
There is no plaw in transportation for cuch people.
Pu4.1 I put.kbos. 10 no.1143-44 166. (mm l9a)

LAVIRFAMMENij A. 0,
"Certain Problems of Positive Copying." Thesis for degree of Cand.
Technical Sci. Sub. 15 Arx. 49, Moscow Inst. of tngineers of 0~?odesy, Aerial
Photograpby, and Cartography.
Summary 82, 18 Dec. 52, Dissertations Presented for Degrees in Sdience and,
'Engineerin in Mloscow in 1949. From Vechernya_v Moskva, Jan-Dee.1949

4- 4 C/ 'r ~- , -- - 7 ~- - . -,-! c- - .'
LAVRM IYEVA, A.G., kand.takhn.nauk
On increasing the strength of machine forms in offset printing.
Sbor.st.po kart. no.8:61-70 155. (MIRA 10:12)
(Offset printing) (Map printing)

KOLOSOV, Aleksandr lvanovich; LAVB=!Il~74,_,,Alq~._!~porgiyevna;
SINYAKOV, N.L., red.; STRELKOVA, A.N.,, red.-
PANKWOVAO M.A., tekhn. red.
[Tef-bnology of printing in two books] Tekhnologiia po-
ligraficheskogo izvodstva v dvukh knigakh. Moskva, Is-
kusiltvo. V01.1. Preparation of grItted forms) Izgotovlenie
pechatnykh form. 1963. 487 p. (MIRA 17:2)

IAVRENT~IVA, -A L (Kiev)
,
"The Role of Microelements in the Fight Against Sterility in Agricilltural.
Animals."
Report given at 13th Inter-VUZ (Higher Educational Insts.) Scientific-
Industrial Conference, held February, 1956 at Kiev Vet Inst._

L~'ViiENITIEIMIA.
Brandy
Determination of furfurul in coguac Vin. 12 0. "t, 1; ~2.
r1onthly List of Russian Accessions, Librea-y of Congress, June 191.312.

IAVZWIYNVA. A.M. a-ass latent 0'
-P upillary reaction In glaucoma [with summary in Zngliahl* Yeat"Oft'
7,1,no;5S3B-27 S-0 '58 MEtAna;)
av 3,A& Platneva) 11 Mosiov-
u edra glasnyth bolezney (z prof*
skogo neditsinskogo Insitituta imeni N.10 Pirp'ioivae
(GLkUCO,Kk# phy~lol; , '. I
pupillary reaction (RUB))
(PUPn.. in various die.
gi&-~Ooma (Rue))

LAVRENTIYEVA,.A.M.; HAYEV~KAYAj, T.M.
Etiological treatment of herpetic kdMti-tiq;'--,Vedt. oft. 76
no,,34.29-32 MY-Je 1630 17:2)
1, ~Kafedra glazrqkh bolezney (zav. pr~~ letneva)
P
II Moskovskogo meditainskogo instituta'-'I"aa-tif. Pirogova
i Institut viftsologii.imeni D.I. IvA..I..,,"-,g,,,, dir,
deystvitelinyy chlen AMN SSSR V., AMN
Prof.
SSSR.
~;Yi

IAVRENTIYEVA, A. M., Candidate Ned Sci (diss) -- "Visual reactions in glau-
coma". Moscow, 1959. 18 pp (Second Moscow Med Inst im N. I. ftrogov), 250
copies (KL, No 25, 1959, 141)

MAYEVSKAYA, T.M.; LAVR:-IITIYE:VA, A.M.
Isclation of herpes vir-as frcm Patients with herueeti-, kej-ral~itl.-~. V~~r.
~ I RA
virus. 9 no.2:216-219 Mr-Ar, 164. ~l t
1. Institut virusologii imeril Ivanovskogo AMN S-SSR, Mzsk-va i
glaznykh bolezney !I lloakovakngc, meditsillakego inatitata imem. Pirc5g,~;va.

LAVI'Mr, tyw--.A, A. F.
24275 LA11MITIEVA, A. P. K anatorii 1-inifatichesIdkh sosudov susudov cw.,hozhd3-i.
ni-zl-:q--y konech-nosti elholovela. Trut, L--nin.-r. 3an.-~~&-ien. .';eJ. il"!~TA,
T. T-Ii, llo.lp, s. 141-48. - Bi-Llj-o.-r: 13 '-',a--V.
SO: Letopis, 1,10. 32, 1949.

MATVEYEVY A.A-- KDTLYAROVA, CeS.;.LAVRENTIYEVA2 A.V.; AVDYUNIN, N.I.;
MMWAKAYA, A.I.; PEMICHEVA, M.A.;
Quality of students' Imowledge in chemistry..Khim. v shkole 17 no.2:
91-94 Mr-Ap 162, (MIRA 15:3)
(Chemistry-Study and teaching)

VASIK,, G.Ye.; KIRYUSHKIN, D.M.; LAVRENTIYEVA, A.V.; SYROYEZHKIN, I.T.
Organizing the independent work of students during the study
. . of the general properties of elements. Khim. v shkole 18
no-4:43-48 J1-Ag 163. (MIRA 17:1)

LAVRENTIYEVA, A.V., uchitellnitsa
Organizing student experiments in chemistry lessons. Khim. v
sbkole 17 no-503-57 S-0 162. (MIRA 15:9)
1. Grednvaya shkola, No.433, Moskva. -
(Chemistry-Experiments)

LAVREVTIYLTA~~ G, A,
flTerminology of the Theory of Yechanisms
(Structure and Classification of Mechanisms).fl
Thesis for degree of Cand. Technical Sai.
Sub. 27 Oct. 50, Inst of Machine qtudies, Acad Sci USSR
Summary 71, 4 Sep 52, Dissertations Presented for Degrees
in Science and Engineering in Moscow in 1950. From Vechernyava
K;s-kva.Jan--De`=l950

G 4.
J,
. P.-
V
oil
P~
5,
Ali
18
i3

3702h
S/044j62/000/003/092/092
Clll/C333
AUTHORSs '~.Cherenin, V.P., Lavrentlyeva,G.A.
':Zhidkova, N.V.
Expeirimental information language for the mechanized
TITLEs
search of the scientific-technical literature
.-PERIODICALt Referativnyy zhurnal., Matens, ika, no- 3, 79,
t 1962
abstract 3 V 494, ("Vychisi. matematika", ab 6~ 1960,
lie - ;60
~:TEXT: It is pointed to the boundedness of the traditional methods
lor-s6arching the scientific-,techni
cal literature, and the pocularities
f., the new searching methods are analyzed which are constructed without
considering the synthetic relations between the characteristics of the
-4".object columne (methods of Ranganatanp Moorap Taub) as well as with
Conbideration.of the complicated and essential Bynth
ail; relations
(Mithods of Perryp Andrew and Newman* Perradeyn). The foundation of
'.Most.o"f.these methods is the idea not to operate with the object
-.volumsf but with their representations by sets of more general sense
Unit oh6raoteristice synthetically connected with each other.
Cardl/3

mftperimental information language S/044j62/000/003/092/092
CIII/C333
exDerimental informative searching machine are described; the basis of
these demands is the guarantee of a suitable comparison of the questions
and columns and a sufficient flexibility for the transition from one
experimental code to another under a maximally simple conetruotion.
The authors describe the structure and functions of the experimental
information machine constructed in 1954 and completed lateron by an
annex which renders possible the comparison of the codes.under
consideration of thefssefitial synthetic relations (of the type of
single grouping). The method for the coding of the object columns and of
the characteristics of the question is described, The machine is
tentatively used since 1958 for the experimental search of literature
on the domain of mechanics. The results of the first experiments are
most promising; a complete estimation of the elaborate-4 searching
a.yetemi however, will require much experimental work, where by'the
processes in single stages must be improved, the uniqueness and the
automatization of the second indexing must be increasedf the strategy of
searchine must be developed, the structure of the representationsof the
0
b cte and of the terms must be varied.
j:
[Ab tracter's note i Complete,translation.]
Card 3/~

~.AVRENVY-Lvk, SLYUSAPEINKO, T.P.
KVt.SNLII(' N~
rf frle-
r, AN 0' 1 Uyevskly

PETROVA.. A.., stra,khovoy delegat; IAVRENrOYEVA.. K., strakhovoy delag~at
They could do more. Okhr.trada i sQts.strakb, 5 no,l2s16 D 162.
(KRA 16":2)
(Mostroma-Plywood industq~--Hygienic aspecto)

LAVRENTIYEVA, L. D.
Acad Sci Kazakh SSR. Inst of Power
LAVRENTIYEVA, L. D.- "The qualitative characteristics of the hydrauliepower resources
of mountain rivers." Aced Sci Kazakh SSH. !nst of Power. Alma-Ata, 1956.
(Dissertation for the Degree of Candidate in Technical Sciences.)
SO: Rdzhnaya Letopi I No. 13., 1956.

,~-)YF Vh .
L h ~-I~ L
I 11114~' 0 'L.D.
HBVO N.. S..;, LAV 1 -1
Ilypsometric index for the qualitative evaluation of water-power
resourseB. Izv.AN lazakh.SSR.Ser.energ.no.11:62-69 156.
(Hydrology) (MM 10:2)

KALACHEV., Pikolay Stepanovicb; ~ i~~K ~1.)~EVA ', Lyud'miq-~' , "GOZHEV,
.LMLtrjYTTA'-; CHOKIIII Sh.Ch., akademik, red.; PO
~-- GLAZYRINA D.14,, red*
A.S., red.,
[Cadastral survey of water-power resources of the rivers
of the Kazakh S-S-R-; potential resources] Vodnoenerge-
ticheskii kadastr rek Kazakhskoi SSR; potentsial InYG re-
sursy. Alma-Ata, Naukaj 1965. 706 p. (MIRA 18:7)
1. Akademiya neuk Kazakhskoy SgR (for Chokin).

IAVRENTIYEV, P.F. *7 IYEVA-, L.D.
Bffect of the rate of stream flaw on annual distribution of
runoff. Trudy KazNIGMI no.12:64-72 159.
(141M 13:5)
(Dzungarian Ala-Tau--Runoff)

LAVRE
Approximate evaluation of the avei-age flow-from tbq watershed of
the southwestern slope of the Tarbagatay Range, Izv. ".11 Kazakh.
M. Ser, energ. no.2:106-111 161.. (MIRtk 14:12)
(Tarbagatay Range--Water supply)

KAT-ACHEV, N.S., kand.tekhn.nauk;-LAVRENTOYEVA, L.D., kand.tekhn.nauk
New data.on hydroelectric power resources in Kazakhstan. Vest.
AN Kazakh.SSR 18 no.3-1:19-28 N 162. NMA 15:12)
.(Kazakhstan-Hydroelectric power)

U.VRENTIYF,V, P.F.;_.LAVRE!TjEVA".D.,--,
Wator and water-power resources cf the rIvers in Scuth Kazakhstan,
Tnidy Otd. geog. All Kazakh. SSR no.11015-134 165. (MIRf 1801

DAMIRv Ye.A.1 LAVRENTIYKVAt__L-.F.
Experimental use-of vitamin B15 for the *protection of the liverm
in anesthesia and toxic effects. Eksper. khir. i anest. 9
no.5:67-70 S-0 164. (MIRA 18tll)
1. Kafedra anesteziologii (zav. - dotsent le.A.Damir) TSentrall-
nogo instituta. usavershenstvovaniya vrachey, Moskva.

SOV/11Z-59-?.-Z332
Translation from: Ref erativnyy zhurnal - Elektrotekhnika, 19 59, Nr 2, p 7 (USSR)
AUTHOR: Presnov, V. A., and Lavrent'yeva, L. G.
TITLE: Investigation of Vacuumtight Ceramics
(issledavaniya vakuumnoplotnoy keramiki)
PERIODICAL: Tr. 1 --y Mezhvuzovsk. konferentaii po sovrem. tekhn. dielektrikov
i poluprovodnikov. 1956, L. , 1957, pp 76-84
ABSTRACT: The VK-92 vacuumtight ceramic mass (containing 9070 talcum plus
kaolin and boracite) contains a considerable amount of free silica SiO? in the
form of christbbalite; because'of a christ6balite modification change, the mass
has a maximum of temperature expansion factor at 2200C. Addition of MgO
binds SiO? and facilitates the formation of clinoenstatite Mg?S'03 after fir-Ing.
With the addition of 6% of M90 at 1,4000C, the crystalline phase consists
almost entirely of clinoenstatite. X-ray analysis data shows that at
9 (a product of talcum disintegration) and
950-1,0000C M 0 reacts with SiO
Card. 1/Z

SOV/112-59-2-2332
Investigation of-Vacuumtight Ceramics
forms Mg silicates. The free SiOz content in the VK-92 car- also be reduced
by introducing alkali-earth and alkali-metal oxides. Tg~ of the VK-92 mass
decreases upon introduction of MgO. A plot of conductance against temperatlz,~e
testifies to the fact that the nature of current carriers does not change In tkis
case. Addition of alkali-metal and alkali-earth metal oxides reduces the
maximum temperature coefficients of mass expansion and strengthens it
mechanically. An ultraporcelain-53 to which 316 of ZrOZ or SiO? was added. t-~
improve its cohesion with metals was also investigated. This changed ItF
electrical and mechanical properties slightly. A juxtaposition of the pl-Opertles
of ceramic materials with the characteristics of their fundamental crystallLae
phases shows that material properties are primarily determined in their
amorphous phase. Bibliography. 17 items. Sibirskiy fiziko-tekh',-7-4.che,-R;.y
institut (Siberian Physics -and -Engineering Instituto.
F.B.G.
Card Z/2

AUTHORS: Lavrentlyeva, L. G. and Presnov, V. A. SOV/139-58-4-22/3u
.TITLE: Steatite Ceramics
(0 polimorfizme steatitovoy keramiki)
I. X-ray Investigation of the Structure of Steatite
(I. Rentgenograficheskiye issledovaniya struktury steatita)
PERIODICAL: Izvestiya Vysshikh Uchebnykh Zavedeniy, Fizika,
1958, Nr 4, pp 135-139 (USSR)
ABSTRACT: Paper presented at the Inter-University Conference
on Dielectrics and Semiconductors, Tomsk, February,1958.
In the past much attention has been paid to the physical
and technological properties of the manufacture of
steatite but too little attention has been given to the
microscopic processes, i.e. to structural changes,in
spite of the fact that these changes govern the observed
changes in properties. The main aim of the here described
work was to study the structure and structural changes
of vacuum-tight ceramics. The Process Of forming was
studied of the crystalline component of various steatite
materials which were produced by pressing and also by
casting,under pressure in the hot state. First,the
Cardl/4 structural studies are described of specimens produced by

6n the Polymorphism of Steatite Ceramics SOV139-58-4-22/30
pressing. In studying the ceramic material VK-92 (B)
the lines enumerated in Table 1, P 156, viere solected
as being the most characteristic for each phase under
consideration. The changes of the phase composition of
this cergic is graphed in Fig.la; it can be seen that
up to 850 C talc predominates, then, due to decomposition
of the talc, an intermediate product,hydroenstatite,
forms which becomes transformed at more elevated
temperatures into protoenstatite; the silica which
separates out during the decomposition manifestsoitself
in the X-ray patterns as christobalite from ;100 C
onwards. Specimens fired above 1250 to 1320 C show a
partial transformation of protoenstatite into 0
clinoenstatite but even specimens fired at 14-00 C contain
magnesium metasilicate, predominantly in the form of
protoenstatite. Magnesium oxide additions between
I anff. 6% were tried and also barium oxide additions
as well as additions of oxides of alkali metals
(!%.Na2o or K20). In Table 2 an enumeration is given
of the bending strength of specimens from three types of
Card2/4 materials produced by casting under pressure and, for

On theftlymorphism of Steatite Ceramics SOV/139-58-4-22/30
comparison, the data for the same materials are given
if produced by pressing. Some of the results obtained
on specimens produced by casting under pressure in the
hot state are graphed in Fig.3 and it can be seen that
generally the dependence of the phase composition on the
temperature is comparable for all the tested ceramic
materials. The determined higher mechanical strength of
ceramic materials produced by casting under pressure
is attributed to the absence of polymorphous transforma-
tions of magnesium metasilicate.due to the stabilisation
of protoenstatite and also to the saturation of the glass
phase and possibly also of the crystal phase with silica
which results in an improvement in the physico-chemical
and mechanical properties of the glass phase, which in
turn brings about a stabilisation of the protoenstatite.
The results are summarised thus:
1) It was found that additions of magnesium oxide bring
about a transformation of the protoenstatite into
clinoenstatitel, Whilst BaO'Na 0 and K20 brake such
transformation. This is probVbly due to the change in
Card3/4 the composition of the glass phase resulting from the

On the Polymorphism of Steatite Ceramics SOV/139-58-4-22/30
simultaneous transformation of the silica into the glass
phase.
2) During firing of cast specimens, a transformation of
clinoenstatite into protoenstatitewts observed (1100-1150'C).
The formed protoenstatite has a higher stability to
polymorphism and this can be due to either a partial
dissolution of the christobalite into the glass phase
which brings about an increase in viscosity, or formation
of a solid solution of silica in the protoenstatite which
slows down the process of polymorphous transformation.
There are 3 figures, 2 tables and 7 references, 6 of which
are Soviet, 1 English.
ASSOCIATION: Sibirskiy fiziko-tekhnicheskiy institut pri Tomskom
gosuniversitete imeni V. V. Kuybysheva
(SiberianPhysico-Technical Institute at the Tomsk State
University Imeni V. V. Kuybyshev)
SUBMITTED: March 19, 1958
Card 4/4

SOV/139-58-5-9/35
AUTHORS:7~~~ and PreBnov, V. A.
TITLE: Polymorphism of Steatite Ceramics. II. The Effect of Heat
Treatment of the Ceramic on the Composition of the Crystal
Phase (0 polimorfizme steatitovoy keramiki. II. Vliyaniye
temperaturnoy obrabotki kerami-ki na sostav kristallicheskoy
fazy)
PERIODICAL: Izvestiya vysshikh uchebnykh zavedeniy, fizika, 1958,
Nr 5, pp 48-51 (USSR)
ABSTROT: This paper was presented at the Conference of Higher
Educational Establishments on Dielectrics and Semiconductors,
Tomsk, February,. 1958. The main crystal component of steatite
ceramics is either magnesium metasilicate MgSiO 3 or ortho-
silicate M92S'04, the latter in materials with higher concen-
tratioi~s of magnesium oxide. Magnesium orthosilicate
(forsterite) exhibits no polymorphic transitions. It is
gemerally assumed (Refs.1, 2) that magnesium metasilicate
exists in 2 modifications: a-clino-enstatite and P-enstatite;
these 2 modifications are enantiotropic and th6 transition
Card 1/4

K_./J_59-58-5-9/35
f
Polymorphism of Steatite Ceramics, !I. The Effect of Heat Treatmeni., o.L
the Ceramic on 'the Composition of the Crystal Phase
temperature lies near 1.19000. A third modification', known as
proto-enstatite,, consists of clino-enstatite with a somewhat
deformed crystal lattice. Some workers (Refs.3-6) regard
proto-enstatite as a separate modification of magnesium meta-
silicate, A fourth modification, called 6--MgSiO 3~ has also
been reported (Ref.7), The present paper deals with X-ray
crystallographic studies of steatite samples which have under-
gone various thermal treatments. The authors investigated
polymorphism and stability of modifications of MgSiO 31 The
authors used materials whose predominant crystal phase was in
the form of proto-enstatite and subjected them to thermal
treatment in order to study stability of clino-enstatite.
Thermal treatment below 10000C and of several hours' duration
produced a 6nall increase in the amount of clino-enstatite.
Transformation into clino-enstatite occ=-s faster if the mat-
eriall is in powder form. Longer treatments produce complete
transformation of proto-enstatite into clinc-enstatite. Heating
the ceramic for 25 hours at 115000 transforms i,,lino-enstatite
into -Droto-enstatite (Table 1).. Longer heating with LiF flux
Card 2/4 induces the reverse transformation with prcto-enstatite chang-

SOV/1139-58-5-9/35
Pol,ymorphism of Steatite Ceramics. II. The Effect of Heat Treatment
of the Ceramic on -the Composition of the Crystal Phase
ing into clino-enstatite on cooling to room temperature. The
authors also studied the structure of samples subjected to
multiple heating at temperatures close to the firing tempera.-
ture. The relative chan-ges in the amounts of proto-enstatite
and clino-enstatite9 deduced from the X-ray crystallographic
data, are shown in Fig.1'. Composition of 4 ceramics (VK-91,.
M-49;iK-11) K-2) studied is given in Table 2; all 4 of them c6n-
Isist mainly of talc. The following conclusions are made from
the results obtained, 1) Proto-enstatite is the stable modi-
fication of MgSiO., ai; high temperatures. 2) A polymorphic
I
transition of proto--enstat-ite into clino-enstatite, accompanied
by a change in volume, is possible on cooling of a sample, on
r00000 and in storage. 3) The change in
heat treatment below 1
volume occurring in the polymorphic transition referred to
above may be the reason for the poorer mechani.oal strength and
the loss of impermeability to -ases useful in vacuum work.
4) The rate of polymozphic transformations depends on the com-
position of the glassy phase of the ceramic and on the dimensions
of crystallites; t-he rate increases with decrease of viscosity
of the glassy phase and with increase of dimensions of proto-
Card 3/4

SOV/139-58-5-9/35
Polymorphism of Steatite Ceramics. II. The Effect of Heat Treatment
of the Ceramic on the Composition of the Crystal Phase
enstatite crystallites. 5) The mechanical strength of stea-
tite ceramic materials increases with decrease of the free
silicon content in the form of cristobalite, as shown in
Fig.2 (data on mechanical strength were obtained from the
laboratory directed by Kh. B. Kogan). The work reported in
the present paper is part of a wider programme at the Siber-
ian Physico-Technical Institute, carried out in conjunction
with engineers. There are 2 figures, 2 tables and 9 referen-
ces, 5 of which are Soviet and 4 German.
ASSOCIATION: Sibirskiy fiziko-tekhnicheskiy institut pri Tomskom
gosunm-versitete imeni V. V. Kuybysheva (Siberian Physico-
Technical Institute at Tomsk State University 1m.V.V.Kuybyshev)
SUBMITTED: March 19, 1958.
Card 4/4

S111216010001051131623
Wanslation from: Referativnyy zhurnal. Elektrotekhnika, 1960, No. 5, P. 357,
5. ~037
A,=* OR- Lavrentlyeva, L. 0.
TIME: Investigating Composition and Structure of Vacuum-Tight Ceramics and
Their Properties
PERIODICAL: Uch. Zap. Tomskiy un-t, 1958, No. 32, PP. 18-28
I M ; Invest4gations were carried out to establish the dependence of the
propertijes ofBK-92V(VK-92) grade vacuum-tight ceramics, used as shells of metal-
ceramieDradio tubes, on the quantity of several additives added to the tale
constituting 90% of the mass. The author gives tables of the electilic and mechan-
ical properties of ceramics with different L4LO,'lBao 7and N Oklontent and describes
the formation processes of the crystalline phase of VK-92 ceramics during baking
at temperatures ranging from 20 to 1,4000C. The addition of MgO to the mass
results In the formation of clinoenstatite as the basic crystalline phase. The
addition of other alkali or alkali-earth oxides does not alter the basic
crystalline phase of ceramics. The addition of barium and magnesium oxides
Card 1/2

S/112/60/000/05/13/023
Investigating Composition and Structure of Vacuum-Tight Ceramics and Their
Properties
results in a leveling of the maximum of the curve showing the mean coefficient
of thermal expansion as a function of temperature, which improves the heat
resistance of cer Insignificant additions of alkali metal oxides V
deteriorate the electric and mechanical properties of ceramics considerably.
S. E. K.
Card 2/2

SOV/81-59-9-32101
Translation from: Referatlvnyy zhurnal. Khimiya, 1959, Nr 9, p 360 (USSR)
AUTHOR:- Lavrentlyeva, L.G.
TIM: The Effect of the Composition and the Structure of Vacuum-Dense
Ceramics on Its Properties
PERIODICAL Uch. zap. Tomskiy un-t. 1958, Nr 32, 28
,pp 18
ABSTRAM The structure of vacuum-dense VK-2? eramics and the effect of the
change in structure on its mechanical and electrical properties have
been studied. It has been established that the principal crystalline
phase of VK-92 ceramics is mesoenstatite. An addition (I - 6 weight 11
of MgO leads to the formation of clinoenstatite as principal crystalline
phase. The introduction of other oxides (in weight %): BaO 1-4, Na2O
10 K20 I)does not change its principal crystalline phase. All the
oxides introduced decrease the quantity of free cristobalite and thereby
Improve the heat-resistance of ceramics. A diagram of the processes of
formation of the crystalline phase in steatite ceramic materials\l'is given.
The electrical and mechanical properties of the ceramic materials studied
Card 1/1 are determined mainly by the glass-like phase. G. Gerashchenko

V 1774C
SOV/81-;59-12-43045
Translation froms Referativnyy zhurnal.. Khimiya, 1959, Nr,12, P 310 (USSR)
AUTHOR: Lavrentlyeva, L.G.
,TITLEs The Effect of Additions of Magnesiip Oxide on the Formation Pro-
cess of the Crystal Phase of VKI-92'00eramios
PERIODICAL: Tr. Sibirsk. fiz.-tek.hn. in-ta pri Tomskom. un-te, 1958,. Nr.,36,
PP 153-251
ABSTRACTs The effect of magnesium oxide-additions on the formation of the
crystal phase of the ceramic',mass VK-92)_c 'ontaining > 90% tale,
a small quantity of kaolin and boracite, has been. studied by
roentgen-structure analysiq,. It has been established that the
formation of the ceramic,body of the masses VK-92., M-VI (with the
addition of 6% MgO) and. Ik-II,I' (with the ad.dition o~f-3% M90-) starts
0
with the decomposition of the tale struoture-at 850 900 C fol-
lowing by the formation of hydroenstatite.. At 1,150 1~,~2000C
hydroenstatite is converted to mesoenstatite. At an increase in
the temperature (to 1.,4009C) the structural c 'hanges depend on the
Card 1/2 quantity of magnesium oxide introduced into' the ceramics. In the

67992
BOV/81-59-12-43045
The Effect of Additions of Magnesium Oxide on the Formation.Process of the
Crystal-Phase of VK-92 Ceramics
.mass M-VI a complete transition from the mesoenstatite structure to the clino-
enstatite structure is noted. The latter is the basic crystal phase of this
ceramics. In the mass M-III a partial transition of mesoenstatite to-~clinoen-
0
~statite is noted. After burning.at.l.i.400 C in X-III ceramics exist two-basic
crystal phases, mesoenstatite and-olinoenstatite, approximately.in equal quan-
tities. In the ceramic mass U-92the transition of mesoenstatite to clinoen-
statite practically does not take place.. The basic crystal phase of VK-92
ceramics is mesoenstatite. It is noted that the introduction of 6~~ MgO into
'.the ceramic mass VK-92 accelerateB.the process'of formation of the crystal
phase approximately by 100 00 and causes the.formation,.of the crystalline phase
in the form of clinoenstatite.-
G. Maslennikova
Card 2/2

SOV/81-59-12-43064
Translition fromt Referativnyy zhurnal. Khimiyaj 1959P Nr 12, P 312 (USSR)
'AUTHORs. Lavrentlyevaq L.G.
TITLE: The Process of Formation of the Crystal Phase of Forsterite Ceramics
PERIODICAM. Tr. Sibirsk. fiz.-tekhn. in-ta, 1958, Nr 36, pp 203-204
ABSTRACT: The formation of the crystal phase of forsterite ceramics has been
studied by roentgen-structural analysis. The forsterite mass was
prepared on the base of tale and MgO (25%) with inconsiderable ad-
ditions of kaolin and boracite. It has been established that the
crystal phase of the investigated ceramics consistsmainly of for-
sterite. The transition from the structure of talc and MgO to the
forsterite structure takes place with the formation of an inter-
mediate crystal phase, hydroenstatite. The formation of forsterite
0
is completed at 1,200 - 1,250 C, then recrystallization takes place,
which leads to the growth of crystals.
G. Maslennikova
Card 1/1

LAVREP,lTlYEVA, L. G., Cand Phys-l.'ath Sci -- (diss) "Research into the
structure of steatite ceramic radio-waterials." Torr,--k, 1960. WA -pp;
Tomsk State Univ im V. V. Kuybyshev); 11,150 copies; Drice not" c-iven; (KL,
24-60, 128)

Films of gallium arsenide and their properties. V. A. Presnov,
M.
GIavrent�~Xa 0. Vilisova, 1. K. Kovalev.
On the Physico-chemical nature of the formation of contacts of gal)i=
arsenide with metals. V. A. Presnov, A. N. Vyatkin.
~Presented'by A. N. Vyatkin--10 minutes).
Renort -cresented at the 3rd National Conference on Semiconductor Corpo*,Inds,
Kiihinev', 16-21 Sept 1963

LAVRENTIMA, L.G.; VYATKINI A.P.; PRMNOVI V.A.
Tunnel effect in filims of degenerate gallium arsenide* Izv. 7yi3,
ucheb. zav.; fiz. no.5:174-176 163. (mij-'a 16:12)
1. Sibirskiy fiziko-tekhnicheskiy institut pri Tomskom gosudarst-
vennom universitete imeni V.V.Kuybysheva.

AUTHORs Lavrentlyevap L. G.; Novelov, I. K. -2.
TITLEs Prie-~aration of single-erya-ta-1 germanium film by sputtering in ii&~IAIM
SOURCEt Ref. sh. Elektronika i yoye primeneniye,, Abe. 9B89
REF SOURCEs Dokl. Nauchno-tekhn. konforentaiiq ponyashch. dnyu radio. Tomakp
TomakLy-ua=4 196,4# 3-6
TOM TAGSs single crystal semiconductor single crystal, germs ium single crystal
kBSTRAGTt Epitaxial M2-
of Go were obtained at substrate temperatures of the
order of 450-5000C. Go of-p-typs was sputtered from a tungsten spiral onto an
n-type Go substrate. The source temperature was 1100 to I-IDDIDC. The bass tempera-
ture was maintained by an external heater within a range of 450 to 6500C. The
pressure in the system was 1(r5 mm Hg. The optimum sputtering rate was found to be
113/min. At high sputtering rates a film with a fine-grained deposit on the
surface was obtained. The film thickness was 3 to 15 P - Sputtering of a p-type
film on an n-type Go substrate resulted in the formation of p-n junctions. The
contact was fused into the film with pieces of Sn in air at a temperature close to
tbo molting point bt an. Films Dot protected by Sn were etched away with perhydrol,
LCard

L 32620-66
ACC NR, AR6ODD(Y72
The volt-ampere characteristics of the obtained p-n junctions indicated a recti-
fication coefficient of 2(Mp-a forward current of 52D /4amps wA a back current of
Mtfamp. The relatively high back currents were apparently caused by the higher
concentration defects in the film. Refs.* 3. N.Sh.
BUD GC'DZ.- 90/, MM DATZI none
gJ2
Card