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 effects of impurity doping upon ionic conduction were studied by using samples having the composition, CsPb0.99M0.01Cl2.99, where M was Li, Na, K or Ag. It was concluded that these materials were halide-ion conductors. The ionic conductivity was close to that of halide-ion conductors such as PbCl2. The ionic transport number was found to be greater than 0.9. The conduction was attributed to the migration of Cl-ion vacancies. The activation energy for the migration of Cl was equal to 0.29eV. 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