The conductivity was investigated at temperatures of between 300 and 380K, and frequencies ranging from 20Hz to 32GHz. The crystals underwent super-ionic phase transitions at 343 and 357K, which were associated with anomalies in the conductivity. At room temperature, and a frequency of 1kHz, the conductivity was 0.05S/m and the activation energy was 0.47eV. At temperatures greater than 357K, the activation energy was 0.34eV. At temperatures ranging from 343 to 357K, the conductivity did not obey the Arrhenius law. Relaxation dispersions of the conductivity were attributed to ionic transport in the grains and grain boundaries.

I.Murin, A.Peceliunaite, A.Kezionis, A.Mizaras, A.Orliukas: Solid State Ionics, 1996, 86-88[1], 247-50