Abstract
Estimates of the entropy of activation for conduction show that it is a major source of variation in the magnitude of the conductivity preexponential factor for a wide variety of solid electroytes. In some cases, the entropy is directly related to the activation energy and this relationship accounts for the observed Meyer-Neldel rule. The occurrence of curvature in Arrhenius plots of ionic conductivity, associated with disordering in the mobile ion sublattice, is a direct consequence of the large entropy of activation. The absence of such curvature in the data for various alkali β-aluminas is explained by the zero or small negative entropies of activation associated with the interstitialcy mechanisms of conduction.
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