Structural and transport properties of CdI2 doped silver ion conducting system

The glass system xCdI₂-(100−x)2Ag₂O-(0.7V₂O₅-0.3B₂O₃)] with different amount of dopant salt have been prepared by melt quenching technique. The sample obtained were pulverized and characterized by XRD, DSC, and FTIR. The electrical conductivity studies of the samples have been carried out at different temperatures and frequencies. Conductivity of the glasses increased with the increase in the CdI₂ contents and attains a value of 7.76×10⁻⁴ S/cm at room temperature for the composition having x=30 mol% of CdI₂. Infrared spectroscopic studies on these glasses indicated that the oxyanion network was not affected by the addition of CdI₂. The transport number of the silver ion determined by emf method is nearly unity. The frequency dependence of electrical conductivity for various glass compositions at different temperature has been analyzed in terms of Jonscher's Universal expression. In the present CdI₂ doped system, the conduction is due to the Ag⁺ ions attached to the AgI which is formed due to the exchange reaction between CdI₂ and Ag₂O.