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 (0.89eV, 1.3 x 10–13s) and (0.84eV, 3.6 x 10–10s). The ac impedance spectroscopy indicated that the Bi5TiNbWO15 ceramic was an ionic conductor with an electrical conductivity of approximately 2.6 x 10–2S/cm at 1073K.

Intergrowth Bi2WO6–Bi3TiNbO9 Ferro-Electrics with High Ionic Conductivity. Z.G.Yi, Y.X.Li, Z.Y.Wen, S.R.Wang, J.T.Zeng, Q.R.Yin: Applied Physics Letters, 2005, 86[19], 192906 (3pp)