Thermodynamic Evaluation of Solid-State Reactions in which a Volatile Product is Formed |
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Authors: | Email author" target="_blank">Alexander A?KodentsovEmail author Jorma K?Kivilahti Frans J J?van Loo |
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Institution: | (1) Laboratory of Solid State and Materials Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands;(2) Laboratory of Electronics Production Technology, Helsinki University of Technology, FIN-02150 Espoo, Finland |
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Abstract: | Summary. The use of equilibrium thermodynamics in describing interfacial reactions between non-ionic inorganic solids is demonstrated
using examples of high-temperature interactions in the Ti–Si–N and Mo–Si–N systems. In the case of a diffusion-controlled
process, solid-state reactions can be interpreted with chemical potential (activity) diagrams. The role of volatile reaction
products formed during interaction in developing the diffusion zone morphology is analysed. The interfacial phenomena in systems
based on dense Si3N4 and non-nitride forming metals can be explained by assuming a nitrogen pressure build-up at the contact surface. This pressure
determines the chemical potential of Si at the interface and, hence, the reaction products in the diffusion zone. |
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Keywords: | , Ceramics, Phase diagrams, Thermodynamics, Transition metals compounds, |
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