Reactions of sodium oxide with the oxides VO2, V2O3, VO, and vanadium metal

Abstract

The reactions of sodium oxide with vanadium metal and its lower oxides are described for different molar ratios of reactants. All reaction products are identified by powder X-ray crystallography and the reaction temperature determined by differential thermal analysis.

No ternary oxides containing vanadium in the 4+ state were formed in the reactions of sodium oxide with vanadium dioxide; an equimolar mixture gave NaVO₂ and Na₃VO₄. The ternary oxide NaVO₂ was prepared by the reaction of vanadium(III) oxide with sodium oxide in equimolar proportions, but sodium orthovanadate Na₃VO₄ was formed at higher sodium oxide concentrations. This product was also formed from reactions of the monoxide and vanadium metal with sodium oxide.