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Optimization of divalent magnesium ion conduction in phosphate based polycrystalline solid electrolytes

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Abstract

A highest Mg2+ ion conducting polycrystalline solid electrolyte was successfully realized by improving the characteristics of both grain bulks and grain boundaries simultaneously. The former improvement was achieved by making a solid solution to substitute cation site for higher valent one to create Mg2+ ion vacancies in grain bulks. The latter was realized by obtaining a composite in such a manner to microscopically deposit the insulating secondary phase in grain boundaries. By combining above mentioned two effects, the optimization of Mg2+ ion conductivity at around 800 °C was effectively achieved to reach the total Mg2+ ion conductivity of approximately 10−2 S·cm−1 which is applicable in a practical range.

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Engineering, Osaka University, 565-0871, Suita, Osaka, Japan

    N. Imanaka, Y. Okazaki & G. Adachi

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  1. N. Imanaka
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  2. Y. Okazaki
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  3. G. Adachi
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Correspondence to N. Imanaka.

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Imanaka, N., Okazaki, Y. & Adachi, G. Optimization of divalent magnesium ion conduction in phosphate based polycrystalline solid electrolytes. Ionics 7, 440–446 (2001). https://doi.org/10.1007/BF02373581

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  • DOI: https://doi.org/10.1007/BF02373581

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