An excluded volume model is proposed for the cation-anion interaction in superionic conductors. The resulting cation-anion correlations are in excellent quantitative agreement with the pair distribution function derived from EXAFS measurements on AgI in both the normal beta and superionic alpha phases. Further, from the EXAFS data alone, the model predicts the substantial increase in ionic conductivity at the phase transition as well as the modest temperature dependence above it.
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Hayes et al. (1978) studied this question.
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