Conduction in perovskite-type halides was measured at temperatures of between 150C and the melting point. The ionic transport number was determined by using the Tubandt, emf and ion-blocking methods. The ionic transport number was found to be equal to about 0.99. The conduction was attributed to the migration of Cl-ion vacancies. The activation energy for the migration of Cl was equal to 0.39eV. The vacancy diffusion coefficients were found to be very large. However, impurity doping did not markedly increase the ionic conductivity; due to low dopant solubility.

J.Mizusaki, K.Arai, K.Fueki: Solid State Ionics, 1983, 11[3], 203-11