Estimation of ionic drift velocity on some fast Ag+ ion conducting systems

A novel experimental technique for approximate estimation of drift velocity (vd) of mobile Ag+ ions in some superionic systems is reported. Wagner’s dc polarisation method, widely used to determine the ionic transference number (tion), was employed as a tool in these measurements. As vd is directly proportional to ionic mobility (μ) at a fixed applied dc field, thus, the thermally activated processes involved in the temperature dependence of vd and μ should exhibit identical behaviour. Energy (Ed) values computed from log vd−1/T plots in the present study are in reasonably good agreement with energy (Em) values obtained earlier from log μ–1/T plots.