Protonic Conduction in LaPO4-based Ceramics.

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  • Amezawa Koji
    Graduate School of Human and Environmental Studies, Kyoto University

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  • 萌芽的研究発表論文　　リン酸ランタン系セラミックスのプロトン導電性
  • リンサン ランタンケイ セラミックス ノ プロトン ドウデンセイ

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Abstract

Significant protonic conduction has been found at high temperature in LaPO4-based ceramics, in which protons are considered to dissolve as defects in the presence of hydrogen-containing gases. This report describes electrolyte properties of 5mol% Sr-substituted LaPO4. In air, this material can be regarded as a pure protonic conductor at 600°C when PH2O>1kPa, and at 700°C when PH2O> 3kPa. At high temperature, low PH2O, and high PO2, the material shows mixed conduction by protons and electron holes. The contribution of electron hole conduction to the total conductivity becomes significant as temperature increases, PO2 increases, and PH2O decreases, although protonic conduction is still dominant even at 900°C in wet air.

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