DefinePK

Abstract

In this paper, we are reporting on specific heat and complex conductivity measurements in crystalline -RbAg4I5 close to the -to- phase transition at 120 K. Using the electric modulus formalism for analysis of ionic conductivity relaxation in -RbAg4I5, microscopic interaction energy for a single-mobile ion whose temperature derivative is proportional to the specific heat was found. The results suggest that a common ion-ion and ion-lattice mechanism for both ionic migration and thermodynamic energy (i.e., the enthalpy) of mobile defects are present in this highly-dense system. The cooperative behavior observed in this transition region drives the phase transition at 120 K in -RbAg4I5.