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785. Investigation of electron and gas-dynamic parameters of hypersound trace behind models moving in argon
Classified abstracts
784-795
The BN cathode is resistant against both poisoning by residual gases and ion bombardment. The current distribution in the cross section of the beam was determined with the aid of a movable collector. V M Levin et al, Prib Tekh Eksper, No 2, March-April 1972, 146-148 (in Russian). 784. Measurements of the thermoelectric cyanine single crystals. (Germany)
power
of copper
33 phtalo-
Measurements are made of the thermoelectric power of /&copper phtalocyanine single crystals. Sample preparation and apparatus for measurements under a vacuum of 10e5 torr, are described. A model explaining the obtained results is presented. C Hamann, Phys Star Sol (a), 10 (2), April 1972, 509-517. 34. HIGH ALTITUDE
AND SPACE TECHNOLOGY 34
785. Investigation
of electron and gas-dynamic parameters sound trace behind models moving in argon. (USSR)
of hyper-
Experimental results on measurement of the conductivity, velocity and diameter of a trace behind models moving in argon at pressure from 30 to 100 torr with velocity of 3300 to 4900 m/s are presented. V N Gadion et al, Zh Tekh Fiz, 42 (5), May 1972, 1049-1055 (in Russian)
37. METALLURGY, INORGANIC ANALYTlCAL CHEMISTRY
CHEMISTRY,
37 786. Method of determining the heat of adsorption of gases on metals. (USSR) In order to determine the heat of adsorption of gases on metals the Q factor of a hollow resonator made from the metal and filled with the gas in question is determined at some specified temperature. The resonator is then heated by lo-20°C and the Q is measured again. The gas is then pumped out, keeping the temperature constant, and the Q is determined once more. The resonator is then cooled to its original temperature and a further Q measurement is made. The heat of adsorption of the gas may then be calculated from a simple formula based on these several measurements. V S Batalov et al, USSR Patent No 326497, appl 17th Nov 1969, publd 10th March 787. Structural
1972.
transformations
in cadmium iodide polytypic
37 crystal.
(Germany) Structural transformations in cadmium iodide polytypic crystal are studied under a vacuum of 10M4 torr in the temperature range of 250-290°C using x-ray methods. R S Tiwari and 0 N Srivastava, Phys Stat Sol (a), 9 (2), Feb 1972, K91-K94. 788. Dislocation networks in vapour-grown as seen by x-ray topography. (Germany)
selenium
single
37 crystals
Regular dislocation networks have been observed in vapour-grown selenium single crystals using the x-ray methods. The experimental system was evacuated to lo-” torr pressure to decrease the absorption of the x-rays. (Japan) K Naukkarinen et al, Phys Sfat Sol (a), 11 (l), May 1972, 327-334. 37 789. Analysis of high-purity iron. (Germany) The relation between the creep limit and the content of carbon, nitrogen and oxygen in high-purity iron is studied experimentally. The iron samples were refined by electron-beam melting and heating in high vacuum. Activation analysis was used to determine carbon, nitrogen and oxygen content in iron. G Blumel et al, Phys Stat Sol (a), 10 (I), March 1972, K69-K73 (in German)
37 790. Near infrared optical and photoelectric properties of Cu20. 1. Infrared absorption in CuZO after annealing in oxygen or He+ particle bombardments. (Germany)
The effects of annealing under oxygen pressures of 50, 100 and 250 torr on the infrared absorption of polycrystalline samples of CuzO are reported. The effects of irradiation by alpha-particles from I to 3 MeV are also studied. (France) B Prevot et al, Phys Stat Sol (a), 10 (2), April 1972, 455463. 37
(USSR) Isothermal diagrams (at 25 and 700°C) of the system Zr-Y-H are presented and it is shown that mechanical mixtures of hydride phases Zr-H and Y-H existing in binary systems are formed in the investigated system. X-ray phase analysis is used for low temperature investigations and the method of measurement of hydrogen pressure by a thermocouple gauge is used for high temperature investigations. The vacuum experimental arrangement with a base pressure of 10m5 torr is described. V I Scherbak et al, Zh Nrorg K&n, 17 (4), April 1972, 1156-l 159
791. The system zirconium-yttrium-hydrogen.
(in Russian). 792. Concentration
and mobility
of fluorine
ion vacancies
37 in CaF,.
(Germany) The electrical conductivity of sodium doped CaFz crystals was investigated between 20 and 900°C in high vacuum. The sodium concentrations in the crystals were determined spectral-analytically by means of calibration samples. W Bollmann and H Henniger, Phy.~ Stat Sol (a), 11 (I), May 1972, 367-371. 37 793. Determination of the time of hole-formation in a metallic layer under the action of single-pulse laser radiation. (USSR) The time of formation of a hole in thin aluminium layers in a vacuum chamber is measured as a function of the energy density of a laser pulse with duration of 30 ns. The role of the shielding layer of p!asma formed at target surface is noted. S I Andreev et al, Zh Tekh Fiz, 42 (4), April 1972, 8933895 (in Russian).
IV. Materials and techniques vacuum technology
used in
41. METALS AND ALLOYS 41 794. Low melting-point alloy with a bismuth base. (USSR) A low melting-point bismuth-base alloy for making vacuum joints, with a high leak resistance and mechanical strength is proposed. The components of the alloy are taken in the following proportions: lead 23.9-24.1, tin 19.9-20.1 percent, bismuth balance. N M Pul’tsin and V K Afonin, USSR Patent No 322391, appl 7th Drr 1967, pub/d 3rd March 1972. 49. MISCELLANEOUS
MATERIALS
AND TECHNIQUES
49 795. Method of producing pressure vessels. (USSR) An improved method of making pressure vessels with several successive shells is described. Instead of arranging the successive shells in contact with one another, gaps are left between them, and the gaps are filled with the working medium under pressure, the pressure difference between the working media in successive gaps being such as to be easily withstood by the intervening shell. The pressure withstood by the whole system thus becomes substantially greater. V M Ostrovskii and A M Brindzinskii, USSR Patent No 323175, appl 22nd July 1970, publd 15th Feb 1972.
387
784-795
The BN cathode is resistant against both poisoning by residual gases and ion bombardment. The current distribution in the cross section of the beam was determined with the aid of a movable collector. V M Levin et al, Prib Tekh Eksper, No 2, March-April 1972, 146-148 (in Russian). 784. Measurements of the thermoelectric cyanine single crystals. (Germany)
power
of copper
33 phtalo-
Measurements are made of the thermoelectric power of /&copper phtalocyanine single crystals. Sample preparation and apparatus for measurements under a vacuum of 10e5 torr, are described. A model explaining the obtained results is presented. C Hamann, Phys Star Sol (a), 10 (2), April 1972, 509-517. 34. HIGH ALTITUDE
AND SPACE TECHNOLOGY 34
785. Investigation
of electron and gas-dynamic parameters sound trace behind models moving in argon. (USSR)
of hyper-
Experimental results on measurement of the conductivity, velocity and diameter of a trace behind models moving in argon at pressure from 30 to 100 torr with velocity of 3300 to 4900 m/s are presented. V N Gadion et al, Zh Tekh Fiz, 42 (5), May 1972, 1049-1055 (in Russian)
37. METALLURGY, INORGANIC ANALYTlCAL CHEMISTRY
CHEMISTRY,
37 786. Method of determining the heat of adsorption of gases on metals. (USSR) In order to determine the heat of adsorption of gases on metals the Q factor of a hollow resonator made from the metal and filled with the gas in question is determined at some specified temperature. The resonator is then heated by lo-20°C and the Q is measured again. The gas is then pumped out, keeping the temperature constant, and the Q is determined once more. The resonator is then cooled to its original temperature and a further Q measurement is made. The heat of adsorption of the gas may then be calculated from a simple formula based on these several measurements. V S Batalov et al, USSR Patent No 326497, appl 17th Nov 1969, publd 10th March 787. Structural
1972.
transformations
in cadmium iodide polytypic
37 crystal.
(Germany) Structural transformations in cadmium iodide polytypic crystal are studied under a vacuum of 10M4 torr in the temperature range of 250-290°C using x-ray methods. R S Tiwari and 0 N Srivastava, Phys Stat Sol (a), 9 (2), Feb 1972, K91-K94. 788. Dislocation networks in vapour-grown as seen by x-ray topography. (Germany)
selenium
single
37 crystals
Regular dislocation networks have been observed in vapour-grown selenium single crystals using the x-ray methods. The experimental system was evacuated to lo-” torr pressure to decrease the absorption of the x-rays. (Japan) K Naukkarinen et al, Phys Sfat Sol (a), 11 (l), May 1972, 327-334. 37 789. Analysis of high-purity iron. (Germany) The relation between the creep limit and the content of carbon, nitrogen and oxygen in high-purity iron is studied experimentally. The iron samples were refined by electron-beam melting and heating in high vacuum. Activation analysis was used to determine carbon, nitrogen and oxygen content in iron. G Blumel et al, Phys Stat Sol (a), 10 (I), March 1972, K69-K73 (in German)
37 790. Near infrared optical and photoelectric properties of Cu20. 1. Infrared absorption in CuZO after annealing in oxygen or He+ particle bombardments. (Germany)
The effects of annealing under oxygen pressures of 50, 100 and 250 torr on the infrared absorption of polycrystalline samples of CuzO are reported. The effects of irradiation by alpha-particles from I to 3 MeV are also studied. (France) B Prevot et al, Phys Stat Sol (a), 10 (2), April 1972, 455463. 37
(USSR) Isothermal diagrams (at 25 and 700°C) of the system Zr-Y-H are presented and it is shown that mechanical mixtures of hydride phases Zr-H and Y-H existing in binary systems are formed in the investigated system. X-ray phase analysis is used for low temperature investigations and the method of measurement of hydrogen pressure by a thermocouple gauge is used for high temperature investigations. The vacuum experimental arrangement with a base pressure of 10m5 torr is described. V I Scherbak et al, Zh Nrorg K&n, 17 (4), April 1972, 1156-l 159
791. The system zirconium-yttrium-hydrogen.
(in Russian). 792. Concentration
and mobility
of fluorine
ion vacancies
37 in CaF,.
(Germany) The electrical conductivity of sodium doped CaFz crystals was investigated between 20 and 900°C in high vacuum. The sodium concentrations in the crystals were determined spectral-analytically by means of calibration samples. W Bollmann and H Henniger, Phy.~ Stat Sol (a), 11 (I), May 1972, 367-371. 37 793. Determination of the time of hole-formation in a metallic layer under the action of single-pulse laser radiation. (USSR) The time of formation of a hole in thin aluminium layers in a vacuum chamber is measured as a function of the energy density of a laser pulse with duration of 30 ns. The role of the shielding layer of p!asma formed at target surface is noted. S I Andreev et al, Zh Tekh Fiz, 42 (4), April 1972, 8933895 (in Russian).
IV. Materials and techniques vacuum technology
used in
41. METALS AND ALLOYS 41 794. Low melting-point alloy with a bismuth base. (USSR) A low melting-point bismuth-base alloy for making vacuum joints, with a high leak resistance and mechanical strength is proposed. The components of the alloy are taken in the following proportions: lead 23.9-24.1, tin 19.9-20.1 percent, bismuth balance. N M Pul’tsin and V K Afonin, USSR Patent No 322391, appl 7th Drr 1967, pub/d 3rd March 1972. 49. MISCELLANEOUS
MATERIALS
AND TECHNIQUES
49 795. Method of producing pressure vessels. (USSR) An improved method of making pressure vessels with several successive shells is described. Instead of arranging the successive shells in contact with one another, gaps are left between them, and the gaps are filled with the working medium under pressure, the pressure difference between the working media in successive gaps being such as to be easily withstood by the intervening shell. The pressure withstood by the whole system thus becomes substantially greater. V M Ostrovskii and A M Brindzinskii, USSR Patent No 323175, appl 22nd July 1970, publd 15th Feb 1972.
387