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Reviews of topical problems


Order-disorder transformations and phase equilibria in strongly nonstoichiometric compounds


Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences, ul. Pervomayskaya 91, Ekaterinburg, 620219, Russian Federation

Data on order-disorder phase transformations in strongly nonstoichiometric carbides and nitrides MXy (X=C, N) of Group IV and V transition metals at temperatures below 1300-1400 K are reviewed. The order-parameter functional method as applied to atomic and vacancy ordering in strongly nonstoichiometric MXy compounds and to phase equilibrium calculations for M-X systems is discussed. Phase diagram calculations for the Ti-C, Zr-C, Hf-C, V-C, Nb-C, Ta-C, Ti-N, and Ti-B-C systems (with the inclusion of the ordering of nonstoichiometric carbides and nitrides) and those for pseudobinary carbide M(1)C-M(2)C systems are presented. Heat capacity, electrical resistivity and magnetic susceptibility changes at reversible order-disorder phase transformations in nonstoichiometric carbides are considered.

Fulltext is available at IOP
PACS: 61.72.Ji, 64.60.Cn, 81.30.Dz (all)
DOI: 10.1070/PU2000v043n01ABEH000647
URL: https://ufn.ru/en/articles/2000/1/a/
Citation: Gusev A I "Order-disorder transformations and phase equilibria in strongly nonstoichiometric compounds" Phys. Usp. 43 1–37 (2000)
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Оригинал: Гусев А И «Превращение беспорядок-порядок и фазовые равновесия в сильно нестехиометрических соединениях» УФН 170 3–40 (2000); DOI: 10.3367/UFNr.0170.200001a.0003

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