Frequency-dependent ionic conductivity in (Ag2S)(x)(GeS2)(1-x) glasses

Following the theoretical model of the polarization conductivity of ionically conducting glasses, based on the notion of ionic ''free-volume'' fluctuations, a new procedure is envisaged to explain the experimental results. This procedure allows us to ascribe a precise physical significance to experimentally determined parameters. On the basis of (Ag2S)(x)(GeS2)(1-x) glasses, we have demonstrated, without ambiguity, that the polarization conductivity dependence on temperature and frequency could be expressed as A(T)omega(s(omega.T)). It is found experimentally that s is a function of temperature T and frequency omega. This result is interpreted theoretically by using the notions of thermal agitation energy and the ''bound-charge'' concept usually used to describe the polarization phenomena.