Abstract
The symmetry analysis of the trigonal, cubic, and tetragonal M2X superstructures formed in strongly nonstoichiometric compounds MXy with the B1 structure has been performed. Disorder-order MXy → M2X transition channels have been revealed. It has been shown that three physically allowable sequences of transitions associated with the formation of ordered M2X phases and order-order transitions between them are possible in nonstoichiometric carbides and nitrides MXy of the transition metals of group IV with a decrease in the temperature.
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