APPLICATION OF THE ANDERSON-STUART MODEL TO THE AC CONDUCTION OF IONICALLY CONDUCTING MATERIALS

A new conductivity model for ionically conducting materials is proposed. For the first time, the Anderson-Stuart model, originally developed to account for the dc conductivity activation energy in silicate glasses, is extended to describe the ac conductivity based on a thermally activated hopping charge process. The theoretical results obtained are analysed and compared with previous experimental data. Despite the paucity of and variation in the experimental results, the present model is not inconsistent with these data and, therefore, may be a new and interesting approach to understand the ac conductivity behaviour of ionic conductors. © 1990.