Abstract
We have studied the ion dynamics in several mixed former glasses in wide composition and temperature ranges. The ionic conductivity obtained from complex impedance plot follows the Arrhenius relation. It is observed that the ionic conductivity of these glasses exhibits mixed glass former effect and depends strongly on the dopant salt content as well as on the mixed former ratio. The composition dependence of the activation energy exhibits an opposite trend by that of the conductivity. The characteristic mean square displacement of mobile ions has been determined from the ac conductivity spectra in the framework of linear response theory. It is observed that the ionic conductivity and the mean square displacement of mobile ions are correlated with the population density of structural units of the glass network. The time-temperature superposition principle has been verified using the scaling of the conductivity spectra.
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