Structural and transport properties of CdI_2 doped silver ion conducting system

摘要

The glass system xCdI_2-(100-x)[2Ag_2O-(0.7V_2O_5-0.3B_2O_3)] 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 CdI_2 contents and attains a value of 7.76 x 10~(-4) S/cm at room temperature for the composition having x = 30 mol% of CdI_2. Infrared spectroscopic studies on these glasses indicated that the oxyanion network was not affected by the addition of CdI_2. 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 CdI_2 doped system, the conduction is due to the Ag~+ ions attached to the AgI which is formed due to the exchange reaction between CdI_2 and Ag_2O.