It has been established by XRD, DTA and TG methods that phases of solid solution type of MoO3 in SbVO5 are formed in the system V2O5-MoO3-a-Sb2O4. The Mo6+ ions are incorporated into the crystal lattice of SbVO5 instead of both Sb5+ and V5+, while the charge compensation occurs by a formation of cation defects (□) at Sb5+ and V5+. The phases Sb1-6x□xV1-6x□xMo10xO5 are stable in the solid-state up to 69010C and the limit of solubility of MoO3 in SbVO5 does not exceed 20.00 mol%.
The use of XRD and DTA methods has allowed studies on the interaction of the SbVO5 and MoO3, taking place in the solid state and in the medium of ambient air. The experimental results of XRD and DTA for all the samples
showed the presence of a novel phase, i.e. Sb3V2Mo3O21 apart from various amounts of MoO3 and V9Mo6O40 or SbVO5 and V2O5(s.s.). The SbVO5–MoO3 system is not a real two-component system over the entire range of component concentrations up to the solidus line.