The model of ionic glass as weak electrolyte revisited

Reference Presenter Authors
(Institution)
Abstract
10-058 Ana Candida Martins Rodrigues Rodrigues, A.C.(Federal University of São Carlos); The weak electrolyte model proposed by Ravaine and Souquet in the 1970s suggests that an ionic glass behaves like a weak electrolyte, i.e., the concentration of mobile alkali ions results from a dissociation equilibrium of M2O in the glass matrix. Thus, the concentration of effective charge carriers, ascribed to the dissociated species that will effectively contribute to the ionic conductivity, is lower than the total concentration of alkali. Hence, the quasi-exponential increase in ionic conductivity observed with alkali content in an oxide glass with increasing alkali concentration would depend more on the variations in effective charge carrier concentration than on their mobility. Here, we present several findings, some of them supporting the idea of glasses as weak electrolytes and others contradicting this notion.
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