Investigation of the high temperature reaction of the alkali metal metavanadates MVO3 (M=Na,K) with the lanthanide oxides Ln2O3 (Ln=Nd,Er)

Article abstract of DOI:10.1016/0025-5408(91)90126-7

The changes occurring in the dielectric constant of an alkali metal metavanadate after it has been treated at high temperatures with a small percentage of a lanthanide oxide have been ascribed to solid solution formation. Analysis of the products obtained by means of Raman spectroscopy, X-ray powder diffraction, SEM and EDX analysis, however, revealed that a small amount of the lanthanide orthovanadate is formed in the metavanadate mass. The reaction that takes place could be described by the following equation: 2MVO₃ + Ln₂O₃ Δ/→ LnVO₄ + M₂O. With stoichiometric amounts of the reagents under vacuum conditions full conversion to the lanthanide orthovanadate occurs.