G 96 Gusev, A. I. Sequence of Disorder–Order and Order–Order Transitions Accompanying the Formation of M2X Superstructures / A. I. Gusev // JETP Letters. - 2010. - Vol. 91, № 3. - P119-124 : il. - Bibliogr. : p. 123-124 (26 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): НЕСТЕХИОМЕТРИЯ -- КАРБИДЫ -- БЕСПОРЯДОК-ПОРЯДОК Аннотация: 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 Полный текст |