Synthesis of Zinc-Doped Lithium Tantalate Charge in the Technology of Novel Crystalline Functional Materials

摘要

A procedure was developed for preparing lithium tantalate (LiTaO3) charge homogeneously doped with lithium from high-purity tantalum-containing solutions, based on heat treatment of lithium-, tantalum-, and zinc-containing citrate precursors. The thermolysis products were studied by thermal analysis, X-ray diffraction, and IR absorption spectroscopy. The optimum synthesis conditions and zinc concentration to obtain a single-phase LiTaO3:Zn charge were determined. Comparison with the properties of an isomorphic compound LiNbO3(LiNbO3:Zn) demonstrated the advantages of the synthesis procedure developed and practically important properties such as high optical stability of LiTaO3:Zn crystals and low coercive field, acquired by lithium tantalate upon doping with zinc. Samples of LiTaO3:Zn charge of various compositions, suitable both for the technology of LiTaO3:Zn crystals and for the preparation of piezoelectric ceramics based on zinc-doped lithium tantalate, were prepared by the developed procedure.