STUDIES ON THE HIGH-PRESSURE REACTION OF ER2O3 AND VO2

The reaction of erbium sesquioxide (Er2O3) and vanadium dioxide (VO2) at 50 kbar and 30 kbar pressures and 1400°C were studied. In the course of the reaction, tetravalent vanadium ions were reduced to the trivalent state and erbium vanadites (ErVO3) were obtained. The crystal structures of the products were examined by an x-ray diffraction analysis. At 50 kbar, a vaterite-type (μ-CaCO3) compound isostructural with ErBO3, which belonged to a hexagonal system, and at 30 kbar, a calcite-type vanadite belonging to a rhombohedral (pseudo-hexagonal) system were obtained. In the case of the reaction of erbium sesquioxide and vanadium trioxide (V2O3) at high pressure, a perovskite-type erbium vanadite was obtained. The magnetic properties of the compounds were studied. © 1979.