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Chemical Processes in Al 2 O 3 -Mo and Al 2 O 3 -W systems in a weakly reducing atmosphere

Fedorov, V. ; Kostomarov, D. ; Antonov, E.

Crystallography Reports, 2014, Vol.59(1), pp.132-136 [Periódico revisado por pares]

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  • Título:
    Chemical Processes in Al 2 O 3 -Mo and Al 2 O 3 -W systems in a weakly reducing atmosphere
  • Autor: Fedorov, V. ; Kostomarov, D. ; Antonov, E.
  • Assuntos: Hydrogen ; Monte Carlo Methods ; Aluminum Compounds
  • É parte de: Crystallography Reports, 2014, Vol.59(1), pp.132-136
  • Descrição: Al 2 O 3 -Mo and Al 2 O 3 -W systems in a controlled Ar(95%) + H 2 (5%) atmosphere at T = 2400 K and P = 1 bar have been calculated by the Monte Carlo method. It is established that the presence of hydrogen in these systems leads to the occurrence of OH, H 2 O 2 , HO 2 , H 2 O, AlOH, AlOOH, AlH, AlH 2 , and AlH 3 components in the gas phase; aluminum hydrides are formed only through the interaction of hydrogen with melt evaporation products. The presence of reducing medium leads to a decrease in the free oxygen concentration by one to two orders of magnitude, which is expected to improve the quality of sapphire crystals.
  • Idioma: Inglês

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