Conductivity and phase transitions in a solid electrolyte RbAg 4I 5

Abstract

The electrical conductivity has been investigated of the solid electrolyte RbAg 4I 5 in the vicinity of phase transitions taking place at temperatures T 1  121.8°K and T 2  209°K. Measurements were carried out both on single crystals and on polycrystalline specimens. The transition at T 1 was found to be extended over a certain temperatures range, and hysteresis was observed. In the case of the transition at T 2 a conductivity jump was observed in single crystal specimens. The result obtained are discussed in terms of a theoretical model, suggested for describing the transition of solid electrolytes into the superionic state.