Mechanisms of Interaction of Molybdenum and Tungsten Polyoxide with Aluminum Oxide Melt under Reducing Conditions


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The main chemical reactions between Mo and W polyoxides and Al2O3 melt in a controlled Ar + H2 atmosphere (T = 2400 K, P = 1 bar) during sapphire growth by horizontal directional solidification have been investigated. Under these thermodynamic conditions, the melt and products of its dissociative evaporation may actively react with the tungsten heater and molybdenum thermal screens of the crystallization system. It is shown that the polyoxides formed during evaporation do not directly interact with the melt; this interaction occurs only with participation of reagents exhibiting pronounced reducing properties (Al, H2, H, WO, Al2O, AlH, AlH2, AlH3). It is established that most of processes occur with participation of aluminum hydrides. A particular role of Mo(W) dioxide–W(Mo) polyoxide functional pairs in the interaction with the melt is determined.

作者简介

D. Kostomarov

Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”

Email: fedorov-metrology@yandex.ru
俄罗斯联邦, Moscow, 119333

V. Fedorov

Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”

编辑信件的主要联系方式.
Email: fedorov-metrology@yandex.ru
俄罗斯联邦, Moscow, 119333

E. Antonov

Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”

Email: fedorov-metrology@yandex.ru
俄罗斯联邦, Moscow, 119333

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