Abstract
An X-ray diffraction study indicates that nonstoichiometric vanadium monoxide VO y ≡ V x O z (y = z/x) has a cubic structure of the DO3 type (space group Fm \( \bar 3 \) m), where vanadium atoms are not only at the 4(a) sites of the metal fcc sublattice, but also at the tetrahedral 8(c) sites. This circumstance fundamentally distinguishes monoxide VO y from strongly nonstoichiometric MX y compounds with the B1 structure and the same space group, where atoms M and X and structural vacancies ▪ and ▭ of the metal and nonmetal sublattices, respectively, are distributed over the 4(a) and 4(b) sites. The dependence of the filling factor q of the tetrahedral interstices by vanadium atoms on the relative content y of oxygen in VO y has been obtained. It has been shown that the composition of cubic vanadium monoxide should be represented as VO y ≡ V x O z ≡ Vx − 2q V 2q (t) ▪1 − x + 2q O z ▭1 − z , taking into account the structure.
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