Lattice Vibrations of Ba(Zn1/3Ta2/3)O3 Crystal with Ordered Perovskite Structure

Abstract

Ba(Zn_1/3Ta_2/3)O₃ dielectric ceramics are known to be useful materials for microwave dielectric resonators. The lattice vibrations of Ba(ZnTa)O₃, a crystal which has a pseudocubic unit cell with a hexagonal superstructure because Zn and Ta ions are in an ordered configuration, are investigated in this paper. Also, the symmetry properties of Ba(ZnTa)O₃ and its ion displacements are examined. The far-infrared reflection spectra and Raman spectra of the ceramics are also presented and discussed in relation to the dielectric losses.