ABSTRACT OF ELECTRON MICROSCOPIC INVESTIGATIONS OF THE STRUCTURE OF PALLADIUM FILMS, BY N V DEMENEV, N N BUINOV, AND MI MILUTINA

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000500070051-5
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: December 15, 2016
• Document Release Date: August 22, 2003
• Sequence Number: 51
• Publication Date: August 7, 1953
• Content Type: REPORT

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CENTRAL INTELLIGENCE AGENCY
INFORMATION REPORT
Abstract of Electron Microscopic Investigations of the
Structure of Palladium Films, by N V Uemenev,
N N Butaov, and M I Milutina
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Electron Microscopic Investigations of the
Structure of Palladium Films
1. The purpose of the investigation of palladium films was to check the moehaniem
of formation and the rules previously obtained by the authors while working with
films of platinum and gold 1,2).
2. Palladium films were obtained on the surface of aqueous solutions of PdCl2 at
temperatures between 9-10?C and between 18-20? by reduction with hydrogen gas.
The velocity of film formation wqLs controlled by alternating the concentration
of the salt and the temperature3). The structure of the films was observed by
an electron microscope, diffraction patterns were made with the seJl`(l.insttrument
and the grain size was calculated after evaluation of the pattern
average thickness of the films was determined by weighing.
3. The films of palladium as well as those, of platinum and gold were very porc+ua.
The thickness of the films fluctuated between 25 and 901. It was difficult to
observe the shape of single Pd Qprystals, but it seemed that they were cubical
with a most frequent size of 50A (sizes between 40 a 5l 80L were measured).
X-ray investigation-- showed a size between 70 to 85A The presence of stresses
of the second type in the films could not be confirmed. These stresses wero
expected because of hydrogen absorption by palladium.
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4. Films of an average thickness of 201 (Fig 1) were obtained at comparatively high
reduction velocities in one minute. Not as uniform fi7p were produced at lower
velocities (Fig 2, reduction five minutes, thickness 2511). On such films larger
aggregates were also observed (Fig 3, reduction four minutes, average thickness
42071). The needle like appearaece and the distinctness of the tiLa boundaries
increased with the i9crease in the rate of reduction. At high rates the thickness
of the films was 15031 and the grain size was not below 100$. 1vidently the large
particles were acting as crystallization centres in the growth of tho film (Fig 2).
The authors have attempted to show that at low velocities of reduction (10?C, for
one hour and 30,minutes) aggregates of a triangular shape were formed, having a
thickness of 60A (Fig 4a).
5. The authors arrive at the conclusion that forces acting in coagulation arc similar
to those acting in crystallization.
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6. Institute of Physics of M.etals, and
institute of Qhemistry and Mietallurgy of
The Ural branch of the Academy of Sciences USSR.
1) N N Buinow, N V Demen-~v, A S Shur; and G G Fadbrova,;D'o1l"Akad?~Nauk 66,
No 2 (1949). ' ?
2) N V Demenev, N N Buinow, and M I Milutina, ibidem 68, No 4 (194 ).
3) N V Demenev, Works of 'zst of Chem and Metallurgy UFAN U8SR.1?, 15 (1948).
7. It is not said in the article what kind of palladium lattice the authore*observed.
It is known that the Pd-H absorption compound has *a different lattice bh~ the pure
Pd. The description of the electron-microscopic observations is very unclear,
partially because of the uncertainty of the experimental results, and partially
because of the bad editing of the article. The conclusion of inc authors concerning
the nature of the acting forces in the film growth may be correct, althdugh the
conclusion is too general as then every phenomenon of absorption, adherence or
even sticking together can be regarded as crystallization.
8. The article is of low quality from the experimental as well as from the theoretical
point of view.
ffiguree referred to in text are those contained in the original Russian text of
Dokl Akad *Tauk USSR, 63, 751-754 (1950)]
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