Anomalous ionic transport in glassy electrolytes |
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Authors: | A Bunde |
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Institution: | 1. Institut für Theoretische Physik, Justus-Liebig-Universit?t Giessen, Heinrich-Buff-Ring 16, D-35392, Giessen, Germany
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Abstract: | Summary We discuss the dynamic structure model recently introduced by Bunde, Maass and Ingram to account for the anomalies of ionic
transport in glassy ionic conductors. The model is based on the experimental evidence that ions in glass maintain their distinct
local environments. Key features include a site memory effect that introduces vacancies appropriate to each kind of mobile
ion, and a mismatch energy that emerges whenever an ion attempts to enter a different kind of site, the combination of both
leads to the formation of fluctuating percolation pathways. The connectivity of these pathways determines the ion mobility
in the glassy network. The exploration of this model by numerical methods leads i) to a power law relationship between ionic
conductivity and cation content (now confirmed in the literature) and ii) to the elucidation of many facets of the mixed alkali
effect. It is suggested that the model could form the basis for a comprehensive theory of vitreous electrolytes.
Paper presented at the I International Conference on Scaling Concepts and Complex Fluids, Copanello, Italy, July 4–8, 1994. |
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Keywords: | Amorphous materials glasses |
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