Abstract
The activation energy of ionic conductivity in a variety of glasses has been studied from a unified point of view. A plot of the activation energy as a function of the cation–anion distance manifests that the glass can be divided into two groups; the examples being chalcogenide and oxide glasses. In the chalcogenide the activation energy becomes smaller with the increase in the cation–anion distance, while in the oxide the opposite trend exists. Origins of these features are discussed in connection with carrier and mobility activations.
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