Abstract
A symmetry analysis has been made of monoclinic and trigonal superstructures of the M6C5 type, which are formed in nonstoichiometric cubic carbides MCy with a B1 structure. Channels of disorder-order transitions MCy → M6C5 have been revealed, and the distribution functions of carbon atoms in the M6C5 superstructures have been calculated. The atomic-vacancy ordering in nonstoichiometric cubic carbides of vanadium VCy and niobium NbCy has been investigated using neutron diffraction and X-ray diffraction analyses. It has been shown that, as the temperature decreases, the Group V transition metal carbides MCy can undergo two physically admissible sequences of transformations associated with the formation of M6C5 phases.
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