FIZIKA A 4 (1995) 2, 125-129

SYNTHESIS REACTIONS AND THERMODYNAMICS OF COMPOUND FORMATION DURING MoMn LAYER SINTERING

LIDIJA I. BELIČ and ALENKA Š. KOSMOS
Institute for Electronics and Vacuum Technique, Teslova 30, 61000 Ljubljana, Slovenia

Received 7 April 1995

Chemical reactions and thermodynamics of high temperature alumina metallization have been investigated. During the firing of MoMn paste, reactions start with oxidation of manganese. The formed Mn₃O₄ reacts with alumina and SiO₂ at a temperature lower than 1200 ^°C. The formation of the metallizing layer is a consequence of lowering of the free energy of the system. It is caused by redox and dissolution reactions, the formation of the glass phase and crystallization process from the liquid phase. With available thermodynamical data and according to the atmospheric conditions, some reactions were predicted and confirmed by X-ray diffraction.

UDC 538.971
PACS 81.20.Ev

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