- Email: [email protected]
1591. Dependence of dislocation density on the growth rate of copper single crystals (USSR)
Classified abstracts 1591-1607 C Guichard and J C Sorer, Le Vide, 26 (152), March-April 1971, 76-79
(in French). 37 1591. Dependence of dislocation density on the growth rate of copper single crystals. (USSR) The dependence of the dislocation density on the growth rate of copper single crystals is investigated. The copper single crystals were grown from the melt in vacuum at 1 × 10-4 to 5 × 10-~ torr using the Czochralski method. V V Sanadze et al, Izv VUZ Fiz, No 7, 1970, 127-130 (in Russian). 37 1592. Investigation of the conditions for production of lanthanum hexaboride of increased purity and stoichiometrie composition. (USSR) The mechanism and conditions for the production of lanthanum hexaboride of high purity and stoichiometric composition, by reduction of La~O3 by boron in vacuum, are described. The optimum temperature of 1900°C at 5 per cent boron excess and pressure of 1 × 10-z torr in the furnace are determined. It is shown that during high-temperature reduction in vacuum at 10 -4 to 10 5 tort, refining of the lanthanum hexaboride takes place. G A Meerson et ai, Neorg Mater, 6 (7), 1970, 1219-1223 (in Russian). 37 1593. Reactions of Na ÷, K + and Ba ÷ ions with 03, NO and H~O molecules. (USA) The above reactions were studied in a drift tube-mass spectrometer apparatus. The rate constants or upper limits are tabulated. The consequences of the results for the D and E region of the upper atmosphere are briefly discussed. R Johnson et al, J Chem Phys, 55 (1), 1st July, 1971, 186-188. 37 1594. Growth of CdTe crystals from the vapour phase by vacuum sublimation. (USSR) Causes prohibiting the control of the type and magnitude of conductivity during the growth of CdTe crystals from the vapour phase by vacuum sublimation in a closed volume are investigated. The preparation technique for CdTe crystals is based on mass transfer of CdTe in a determined thermal gradient by diffusion through the gas phase in a closed volume. The arrangement for vacuum sublimation of CdTe is described. It is found that vacuum sublimation is suitable only for the preparation of CdTe crystals with p-type conductivity and with various deviations from stoichiometry. S A Medvedev and Yu V Klevkov, Neorg Mater, 7 (5), 1971, 753-756
(in Russian). 37 1595. Manufacture and properties of lithium fluoride ingots. (USSR) Lithium fluoride ingots were manufactured by melting the powdered salt in a vacuum furnace at a pressure of 10 to 20 tort, in graphite crucibles. It is shown that the ingots can be used as a source of optical materials. T V Tuytuynnikova et al, Neorg Mater, 7 (3), 1971, 525-526 (in
Russian). 37 1596. Gas-transport reactions of some rare-earth element orthophosphates. (USSR) The mechanism of LnPO4 transport during the reaction with PCI~ is explained and it is shown that gaseous chlorine serves as transport medium and PCI5 only as a chlorine source. An arrangement for filling an evacuated ampoule with PC15 in a vacuum system is described. V P Orlovskiy et al, Neorg Mater, 7 (6), 1971, 971-978 (in Russian). 37 1597. Thermodynamics of fabrication processes and electrical properties of CdS-CdO single crystals. (USSR) Thermodynamic functions of processes of oxygen interaction with CdS were evaluated and CdS-CdO single crystals with small amounts of CdO were synthesized by the technique of vapour condensation in a closed evacuated ampoule. To avoid diffusion of atmospheric oxygen through the quartz walls, the ampoule was placed in argon ambient. O F Lutskaya et al, Neorg Mater, 7 (6), 1971, 930-933 (in Russian). 37 1598. Simultaneous determination of nitrogen and oxygen in titanium and its alloys by isotopic spectrometry. (USSR) An isotopic spectrometer method for simultaneous determination of the nitrogen and oxygen contents of titanium and its alloys is des-
626
cribed. The sensitivity is 5 × 10-4 per cent for oxygen and 10-4 per cent for nitrogen. G K Dudich et al, Zavodsk Lab, 37 (4), 1971, 43~437 (in Russian). 37 1599. New hygrometers for mieroconcentrations of moisture in gases. (USSR) Main characteristics and design features of new Russian instruments for measurement of water vapour content in gases are discussed. E A Gershkovich et al, Izmerit Tekh, No 6, 1971, 76-77 (in Russian). 37 1600. Purification of selenium and tellurium using a method based on their volatility. (USSR) It is demonstrated that using vacuum rectification, very pure selenium and tellurium can be obtained. G P Ustyugov et al, Nizkotemper Termo Mater, Kishinev 1970, 5-11
(in Russian). 37 1601. Growth of CdSe single crystals from the vapour phase in nonstoiehiometric and stoichiometric ambient. (USSR) Results of analysis of CdSe single crystal growth using the technique of static sublimation are presented. R V Baubinas et ai, Liet Fiz Rinkinys, 10 (6), 1970, 907-915 (in
Russian). 37 1602. Investigation of the vacuum melting of copper. (USSR) Technique and results of mass-spectrographic investigations on the vacuum melting of copper are presented. Data on the course of gas evolution during melting are obtained. The investigations included leakage and its influence on ambient composition in the furnace, kinetics of evolution of all components of the furnace atmosphere during copper melting, evaporation of additives in copper during vacuum melting, and the dependence of the oxidation potential of the furnace on the ambient gas. D S Barbarash, Elektron Tekh Tekhnol Organiz Proiz, 8, 1970, 68-75
(in Russian). 37 1603. Gas-chromatographic method of measurement of surface area of carbon black. (USSR) A gas-chromatographic method for determination of specific surface area of carbon black is described in which hydrogen was used as carrier gas and nitrogen as adsorbate. The results of measurement are in agreement with the data obtained by the BET method. A vacuum treatment of carbon black is recommended before measurement to remove volatile contaminants. I L Maryasin et al, Zavodsk Lab, 37 (1), 1971, 41-43 (in Russian). 37 1604. Apparatus for investigation of the time dependence of the tensile strength of glass and polymer fibres in vacuum and different ambients. (USSR) An apparatus for investigation of the life-span of glass fibres is described which enables simultaneous investigation of 20 samples of different length at different static loads in vacuum or in various gases. A V Zakharov and A B Sidorov, Zavodsk Lab, 37 (4), 1971, 491492
(in Russian). 37 1605. Apparatus for fatigue investigations at temperatures of 1.5300°K. (USSR) A simple apparatus for investigation of the fatigue of materials in condensed gas ambients and the influence of high vacuum and low temperatures on the fatigue properties of materials is described. I A Gindin et al, Zavodsk Lab, 37 (4), 1971, 488-489 (in Russian). 37 1606. Some physical properties of iron borides. (USSR) Some physical properties of iron borides FeB and Fe2B, prepared by synthesis in vacuum, are investigated. Thermionic properties were determined in a glass device at a residual gas pressure of 10 -7 torr. The work functions at 1600°K were 3.3 eV for Fe~B and 3.6 eV for FeB. The sublimation energies were determined with the aid of a mass spectrometer and found to be 86.9 kJ/mol for Fe2B and 214 k J/tool for FeB. I I Kostetskiy et al, Neorg Mater, 7 (6), 1971, 951-955 (in Russian). 37 1607. Electrical resistivity of LaCrO3, NdCrO3, SmCrO3 and YCrO3 at high temperatures. (USSR) Electrical resistivity of alkaline earth chromates is investigated in vacuum at 10 2 to 10-2 torr and at high temperatures up to 2300°C.
(in French). 37 1591. Dependence of dislocation density on the growth rate of copper single crystals. (USSR) The dependence of the dislocation density on the growth rate of copper single crystals is investigated. The copper single crystals were grown from the melt in vacuum at 1 × 10-4 to 5 × 10-~ torr using the Czochralski method. V V Sanadze et al, Izv VUZ Fiz, No 7, 1970, 127-130 (in Russian). 37 1592. Investigation of the conditions for production of lanthanum hexaboride of increased purity and stoichiometrie composition. (USSR) The mechanism and conditions for the production of lanthanum hexaboride of high purity and stoichiometric composition, by reduction of La~O3 by boron in vacuum, are described. The optimum temperature of 1900°C at 5 per cent boron excess and pressure of 1 × 10-z torr in the furnace are determined. It is shown that during high-temperature reduction in vacuum at 10 -4 to 10 5 tort, refining of the lanthanum hexaboride takes place. G A Meerson et ai, Neorg Mater, 6 (7), 1970, 1219-1223 (in Russian). 37 1593. Reactions of Na ÷, K + and Ba ÷ ions with 03, NO and H~O molecules. (USA) The above reactions were studied in a drift tube-mass spectrometer apparatus. The rate constants or upper limits are tabulated. The consequences of the results for the D and E region of the upper atmosphere are briefly discussed. R Johnson et al, J Chem Phys, 55 (1), 1st July, 1971, 186-188. 37 1594. Growth of CdTe crystals from the vapour phase by vacuum sublimation. (USSR) Causes prohibiting the control of the type and magnitude of conductivity during the growth of CdTe crystals from the vapour phase by vacuum sublimation in a closed volume are investigated. The preparation technique for CdTe crystals is based on mass transfer of CdTe in a determined thermal gradient by diffusion through the gas phase in a closed volume. The arrangement for vacuum sublimation of CdTe is described. It is found that vacuum sublimation is suitable only for the preparation of CdTe crystals with p-type conductivity and with various deviations from stoichiometry. S A Medvedev and Yu V Klevkov, Neorg Mater, 7 (5), 1971, 753-756
(in Russian). 37 1595. Manufacture and properties of lithium fluoride ingots. (USSR) Lithium fluoride ingots were manufactured by melting the powdered salt in a vacuum furnace at a pressure of 10 to 20 tort, in graphite crucibles. It is shown that the ingots can be used as a source of optical materials. T V Tuytuynnikova et al, Neorg Mater, 7 (3), 1971, 525-526 (in
Russian). 37 1596. Gas-transport reactions of some rare-earth element orthophosphates. (USSR) The mechanism of LnPO4 transport during the reaction with PCI~ is explained and it is shown that gaseous chlorine serves as transport medium and PCI5 only as a chlorine source. An arrangement for filling an evacuated ampoule with PC15 in a vacuum system is described. V P Orlovskiy et al, Neorg Mater, 7 (6), 1971, 971-978 (in Russian). 37 1597. Thermodynamics of fabrication processes and electrical properties of CdS-CdO single crystals. (USSR) Thermodynamic functions of processes of oxygen interaction with CdS were evaluated and CdS-CdO single crystals with small amounts of CdO were synthesized by the technique of vapour condensation in a closed evacuated ampoule. To avoid diffusion of atmospheric oxygen through the quartz walls, the ampoule was placed in argon ambient. O F Lutskaya et al, Neorg Mater, 7 (6), 1971, 930-933 (in Russian). 37 1598. Simultaneous determination of nitrogen and oxygen in titanium and its alloys by isotopic spectrometry. (USSR) An isotopic spectrometer method for simultaneous determination of the nitrogen and oxygen contents of titanium and its alloys is des-
626
cribed. The sensitivity is 5 × 10-4 per cent for oxygen and 10-4 per cent for nitrogen. G K Dudich et al, Zavodsk Lab, 37 (4), 1971, 43~437 (in Russian). 37 1599. New hygrometers for mieroconcentrations of moisture in gases. (USSR) Main characteristics and design features of new Russian instruments for measurement of water vapour content in gases are discussed. E A Gershkovich et al, Izmerit Tekh, No 6, 1971, 76-77 (in Russian). 37 1600. Purification of selenium and tellurium using a method based on their volatility. (USSR) It is demonstrated that using vacuum rectification, very pure selenium and tellurium can be obtained. G P Ustyugov et al, Nizkotemper Termo Mater, Kishinev 1970, 5-11
(in Russian). 37 1601. Growth of CdSe single crystals from the vapour phase in nonstoiehiometric and stoichiometric ambient. (USSR) Results of analysis of CdSe single crystal growth using the technique of static sublimation are presented. R V Baubinas et ai, Liet Fiz Rinkinys, 10 (6), 1970, 907-915 (in
Russian). 37 1602. Investigation of the vacuum melting of copper. (USSR) Technique and results of mass-spectrographic investigations on the vacuum melting of copper are presented. Data on the course of gas evolution during melting are obtained. The investigations included leakage and its influence on ambient composition in the furnace, kinetics of evolution of all components of the furnace atmosphere during copper melting, evaporation of additives in copper during vacuum melting, and the dependence of the oxidation potential of the furnace on the ambient gas. D S Barbarash, Elektron Tekh Tekhnol Organiz Proiz, 8, 1970, 68-75
(in Russian). 37 1603. Gas-chromatographic method of measurement of surface area of carbon black. (USSR) A gas-chromatographic method for determination of specific surface area of carbon black is described in which hydrogen was used as carrier gas and nitrogen as adsorbate. The results of measurement are in agreement with the data obtained by the BET method. A vacuum treatment of carbon black is recommended before measurement to remove volatile contaminants. I L Maryasin et al, Zavodsk Lab, 37 (1), 1971, 41-43 (in Russian). 37 1604. Apparatus for investigation of the time dependence of the tensile strength of glass and polymer fibres in vacuum and different ambients. (USSR) An apparatus for investigation of the life-span of glass fibres is described which enables simultaneous investigation of 20 samples of different length at different static loads in vacuum or in various gases. A V Zakharov and A B Sidorov, Zavodsk Lab, 37 (4), 1971, 491492
(in Russian). 37 1605. Apparatus for fatigue investigations at temperatures of 1.5300°K. (USSR) A simple apparatus for investigation of the fatigue of materials in condensed gas ambients and the influence of high vacuum and low temperatures on the fatigue properties of materials is described. I A Gindin et al, Zavodsk Lab, 37 (4), 1971, 488-489 (in Russian). 37 1606. Some physical properties of iron borides. (USSR) Some physical properties of iron borides FeB and Fe2B, prepared by synthesis in vacuum, are investigated. Thermionic properties were determined in a glass device at a residual gas pressure of 10 -7 torr. The work functions at 1600°K were 3.3 eV for Fe~B and 3.6 eV for FeB. The sublimation energies were determined with the aid of a mass spectrometer and found to be 86.9 kJ/mol for Fe2B and 214 k J/tool for FeB. I I Kostetskiy et al, Neorg Mater, 7 (6), 1971, 951-955 (in Russian). 37 1607. Electrical resistivity of LaCrO3, NdCrO3, SmCrO3 and YCrO3 at high temperatures. (USSR) Electrical resistivity of alkaline earth chromates is investigated in vacuum at 10 2 to 10-2 torr and at high temperatures up to 2300°C.