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 \(Fm\bar 3m\)) 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 \(Fm\bar 3m\)) 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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Original Russian Text © A.I. Gusev, A.M. Bel’kov, T.D. Vyrodova, A.S. Kurlov, 2014, published in Fizika Tverdogo Tela, 2014, Vol. 56, No. 10, pp. 2025–2032.
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Gusev, A.I., Bel’kov, A.M., Vyrodova, T.D. et al. Sequence of transformations during ordering of nonstoichiometric compounds with the formation of M 3 X 2-type superstructures. Phys. Solid State 56, 2092–2099 (2014). https://doi.org/10.1134/S1063783414100151
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DOI: https://doi.org/10.1134/S1063783414100151