Phase equilibria in the V2O5-Sb2O4 system

Differential thermal analysis (DTA) and X-ray powder diffraction (XRD) were used to study phase equilibria, established in air in the V2O5-Sb2O4 system up to 1000 degrees C. It has been found that there is a new phase approximate to SbVO5. The approximate to SbVO5 has been prepared by two methods: by heating equimolar mixtures of V2O5 and alpha-Sb2O4 in air and by oxidation of the known phase of rutile type obtained in pure argon at temperatures between 550 and 650 degrees C. Thermal decomposition of approximate to SbVO5 in the solid state starts at 710 degrees C giving off oxygen. The results provide a basis for constructing only a part of the phase diagram of the investigated system (up to 50.00 mol% Sb2O4).