Download Chemical Properties and Analysis of Refractory Compounds / by E. E. Kotlyar, T. N. Nazarchuk (auth.), G. V. Samsonov PDF

By E. E. Kotlyar, T. N. Nazarchuk (auth.), G. V. Samsonov (eds.)

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Extra resources for Chemical Properties and Analysis of Refractory Compounds / Khimicheskie Svoistva I Metody Analiza Tugoplavkikh Soedinenii / Химические Свойства И Методы Анализа Тугоплавких Соединений

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A. Goryunova [2] presented some data relating to the initial oxidation temperature of gallium and indium phosphides. Gallium phosphide starts oxidizing at about 875 and indium phosphide at 500°C. However, no quantitative data were presented in regard to the oxidation of the phosphides in either the powdered or compact states. 5 g samples) with oxygen. The oxygen was derived from a cylinder; it passed through a drying system into the reactor. During the heating of the furnace, the boat carrying the sample lay outside the heating zone; on reaching the required temperature it was pushed into the furnace, and the duration of the experiment was reckoned from this instant.

6. Velocity constants of the air oxidation of BP (1), GaP (2), and InP (3) as functions of temperature. 9 dation law characteristic of compact metal and alloy samples fails to apply as strictly as might be. However, the results obtained enable us to estimate the onset of oxidation for the phosphides as well as the final oxidation products. These results may be used in studying the possibility of obtaining the phosphides in question by indirect methods, and in developing methods of chemical analysis for the compounds in question and their alloys.

After com- L. L. VEREIKINA . - ~ 500 800 - 700 -/I--_"'----t----+--------j 600 JOO 120 160 200 Fig. 2. Oxidation isotherms of boron phosphide in air. 4 log 3 2 240 2801;'min T Fig. 3. Results of boron phosphide oxidation expressed in log y - log T coordinates. pleting the experiment, the sample was withdrawn from the heating zone, and the reaction products, carefully separated from the residual phosphide, were subjected to chemical and x-ray analysis. The data relating to the air oxidation of boron, gallium, and indium phosphides are presented in Tables 1 and 2 and Figs.

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