New perovskite phases in the systems Li2O–(Nb2O5, Ta2O5)–ZrO2

Abstract

Two new orthorhombic perovskite phases of formula, Li_{0.704 –x}Zr_{0.074 + 4x} Ta_{1 – 3x}O₃, where 0.08 < x < 0.15 and Li_{0.774 –x}Zr_0.057+4xNb_{1 – 3x}O₃, where 0 < x < 0.15, have been synthesized. Their stoichiometries were determined as part of a phase-diagram study of the systems Li₂O–Nb₂O₅–ZrO₂ and Li₂O–Ta₂O₅–ZrO₂. In addition to these new phases, extensive solid solutions based on Zr-doped LiNbO₃, LiNb₃O₈, LiTaO₃ and LiTa₃O₈ have been prepared.