Abstract
EXAFS data on the normal and superionic phases of AgI and the cuprous halides have been analyzed using four structural models: harmonic oscillator, displaced site, anharmonic oscillator, and excluded volume. The most satisfactory description is obtained with the last model, based upon a softened hard-sphere pair potential. The results indicate that the tetrahedral locations in the halogen lattice are preferred by the mobile cations, but that at elevated temperatures substantial cation density also occurs at bridging trigonal sites, yielding the conduction path. Potential energy barrier heights are obtained. Finally, by modeling the conducting cations as a Boltzmann gas in the presence of the potential deduced from the EXAFS data, the temperature-dependent DC ionic conductivity is calculated.
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Boyce, J.B., Hayes, T.M. (1981). Structural Studies of Superionic Conduction. In: Teo, B.K., Joy, D.C. (eds) EXAFS Spectroscopy. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-1238-4_7
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DOI: https://doi.org/10.1007/978-1-4757-1238-4_7
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