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- Title
Mechanisms of Interaction of Molybdenum and Tungsten Polyoxide with Aluminum Oxide Melt under Reducing Conditions.
- Authors
Kostomarov, D. V.; Fedorov, V. A.; Antonov, E. V.
- Abstract
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.
- Subjects
ALUMINUM oxide; TUNGSTEN oxides; MOLYBDENUM; SOLIDIFICATION; THERMODYNAMICS; MOLECULAR interactions
- Publication
Crystallography Reports, 2018, Vol 63, Issue 4, p682
- ISSN
1063-7745
- Publication type
Article
- DOI
10.1134/S1063774518040132