An X-ray Diffraction Study of the Heated Products of Neodymium Oxide, Yttrium Oxide, and Vanadium(III) Oxide at 1400 ° C

Abstract

The heated products of Nd2O3, Y203, and V203 at 1400 C in vacuo (-10-4mmHg) for an hour were studied through an analysis of X-ray diffraction patterns.In the case of Y203-V2O3 system, only a stoichiometric perovskite type mixed oxide (YVO3)was formed.In the, case of Nd2O3-Y2O3 system, a crystal belonging to C-type (Sc2O3-type)was formed, if the mole fractions of Y2O3 in the reaction mixtures were above 0.65, and mixtures of both A-type (La2O3-type) and B-type (Sm2O3-type)compounds wete formed, if the mole fractions of Y2O3 were less than 0.40.When Nd2O3, Y2O3, and V2O3 were heated together lattice constants of the obtained perovskite type crystals were proportional to the mole ratios of Nd2O3 to Y2O3, if moles of Nd2O3 + Y2O3 were equal to moles of V2O3. If moles of Nd2O3 + Y2O3 were more than those of V2O3, Nd2O3 was incorporated more easily than Y203 into the perovskite type crystals.