Intergrowth Bi2WO6–Bi3TiNbO9 ferroelectrics with high ionic conductivity

Abstract

Two dielectric relaxation loss peaks associated with oxygen-ion diffusion in the intergrowth Bi2WO6–Bi3TiNbO9(Bi5TiNbWO15) bismuth layered ferroelectrics were observed. The activation energy and the relaxation time at infinite temperature, for these two peaks, were determined to be (0.89 eV, 1.3×10−13s) and (0.84 eV, 3.6×10−10s). The ac impedance spectroscopy indicated that the Bi5TiNbWO15 ceramic is an ionic conductor with an electrical conductivity of approximately 2.6×10−2S∕cm at a temperature of 1073 K.