Pipe-sphere model for enhancement of ionic conductivity in composite solid electrolytes |
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Authors: | A J Bhattacharyya T R Middya S Tarafdar |
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Institution: | (1) Condensed Matter Physics Research Center, Department of Physics, Jadavpur University, 700032 Calcutta, India |
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Abstract: | It is well-known that the ionic conductivity of a superionic conductor when dispersed with an insulator shows a remarkable
enhancement. In this work we suggest that the contribution coming from grain-boundaries and dislocations is primarily responsible
for this phenomenon in a number of cases. We propose a simple theoretical model for such composites and with the aid of the
Effective Medium Theory (EMT) under self-consistent scheme we estimate the effective conductivity as a function of insulator
volume fraction and particle size for four composites, namely CaF2-Al2O3, CuCl-Al2O3, Sr(NO3)2-Al2O3 and SrCl2-Al2O3. This model is applicable to composites where enhancement is observed for a very low insulator volume fraction and other
prevalent models are inadequate. The results exhibit a good qualitative fit to the experimental data and all characterisitic
experimental observations. |
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