Abstract
We have reported relaxation dynamics of charge carriers in fluoride glasses in the system ${\mathrm{ZnF}}_{2}{\ensuremath{-}\mathrm{A}\mathrm{l}\mathrm{F}}_{3}{\ensuremath{-}\mathrm{P}\mathrm{b}\mathrm{F}}_{2}\ensuremath{-}\mathrm{L}\mathrm{i}\mathrm{F}$ for different compositions in the frequency range 10 Hz--2 MHz and in the temperature range 300--550 K. We have analyzed the experimental data in the framework of the Almond-West formula and estimated the charge carrier concentration, hopping frequency, and the frequency exponent. We have observed that both the hopping frequency and the dc conductivity exhibit a minimum as a function of LiF content and the conductivity is primarily determined by the mobility rather than the concentration of charge carriers. We have also observed that the frequency exponent is independent of temperature but depends slightly on composition.
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