Sequence of transformations during ordering of nonstoichiometric compounds with the formation of M 3 X 2-type superstructures |
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| Authors: | A. I. Gusev A. M. Bel’kov T. D. Vyrodova A. S. Kurlov |
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| Affiliation: | 1. Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, ul. Pervomaiskaya 91, Yekaterinburg, 620990, Russia
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| Abstract: | A symmetry analysis of monoclinic, orthorhombic, and trigonal M 3 X 2-type superstructures, which can be formed in highly nonstoichiometric MX y compounds with B1 structure, has been performed. Channels of disorder-order transitions MX y → M 3 X 2 have been determined. It has been shown that two physically allowed sequences of transformations associated with the formation of M 3 X 2 superstructures are possible in nonstoichiometric MX y compounds of Group IV transition metals with decreasing temperature, i.e., “cubic (space group (Fmbar 3m) ) disordered MX y phase → orthorhombic (space group Immm) ordered M 3 X 2 phase → orthorhombic (space group C2221) ordered M 3 X 2 phase” and “cubic (space group (Fmbar 3m) ) disordered MX y phase → orthorhombic (space group Immm) ordered M 3 X 2 phase → monoclinic (space group C2) ordered M 3 X 2 phase.” |
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