Heterogeneity in optimized solid-state synthesis of metavanadate AVO3 (A = Rb, Cs)

Methanol was used to optimize the solid-state synthesizing method of alkali metavanadates AVO 3 (A = Rb, Cs) for the first time and the benefits are discussed. Due to the optimization, four kinds of heterogeneous AVO 3 compounds, white CsVO 3 [CsVO 3 (W)], yellow CsVO 3 [CsVO 3 (Y)], white RbVO 3 [RbVO 3 (W)], and red RbVO 3 [RbVO 3 (R)], could be easily obtained. The colored compounds CsVO 3 (Y) and RbVO 3 (R) are reported for the first time and their synthetic process has been summarized, while their crystal structure, morphology, vibration spectroscopy, photoluminescence, moisture adsorption and thermodynamic properties were measured and compared to white compounds. The differences in properties of CsVO 3 (Y) and RbVO 3 (R) were hypothesized as the oriented growth and induced defects. All four AVO 3 compounds were excellent white-light-emitting phosphors, and CsVO 3 (Y) and RbVO 3 (R), with additional waterproofness, suggested much more practical value.