Dielectric properties of (K_1−xCs_x)₂ZnCl₄ mixed crystal

Abstract

Depending on the quantity of substituted Cs+ ions (x=0, 0.001, 0.01, 0.05 and 0.2) in (K_1−xCs_x)₂ZnCl₄, the imaginary part of the dielectric constant increases rapidly at around 450 K revealing interesting behavior in the ionic conductivity. The increase of ionic conductivity with increasing temperature can be explained by the mobility of thermally activated ions. In a region of high temperature at around 603K, we observed only a small dependence on the frequency for all mole ratios x. A new anomaly appeared at around 440 K for x = 0.2, related to a change of ionic mobility in the vicinity of a new transition temperature.