Evaluation of transport properties of superionic materials in the system (Cu 1− xAg xI)–(Ag 2O)–(CrO 3)

Abstract

In the present report, an intensive evaluation of transport properties of superionic materials in a pseudoternary system (Cu 1- x Ag x I)–(Ag 2O)–(CrO 3), where 0.05≤ x≤0.25, has been described. Room temperature conductivity studies have shown the formation of solid electrolytes with electrical conductivities of the order of 10 −4 to 10 −3 S cm −1 at 295 K. The observed temperature-dependent electrical conductivity behavior is similar to that of conventional solid electrolytes. Impedance and modulus analyses have indicated the temperature-independent distribution of relaxation times and the non-Debye behavior of these materials. The values of silver ionic transport number ( t Ag+) obtained by EMF technique are nearly equal to the corresponding ionic transport number ( t i) values estimated from the Wagner's polarization method, thus suggesting the formation of silver ion-conducting solid electrolytes in the chosen system. The present thermoelectric power (TEP) data are found to confirm the formation of silver ion-conducting glassy electrolytes in this system.