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Oxygen ion conductivity of the ceria-samarium oxide system with fluorite structure

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Abstract

Ionic conduction of oxygen in the ceria-samarium oxide system was investigated as a function of temperature, partial pressure of oxygen and the oxide composition, together with its crystal structure, density and defect structure. The ionic conductivity of (CeO2)1−x(SmO1.5)x was the highest in ZrO2-, ThO2- and CeO2-based oxide systems. The system CeO2-SmO1.5 consisted of the solid solution with a fluorite structure atx<50 at.%. The ionic transference number was nearly unity between 600 and 900°C. With an increase in Sm2O3 content, the ionic conductivity gradually decreased due to a decrease in mobility of oxygen ions. The samarium oxide-doped ceria was less reducible than pure and alkaline earth oxide-doped ceria.

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Authors and Affiliations

  1. Department of Materials Science and Technology, Graduate School of Engineering Sciences, Kyushu University, 39, Kasugakoen, 816, Kasuga-shi, Fukuoka, Japan

    Hidenori Yahiro, Yukari Eguchi, Koichi Eguchi & Hiromichi Arai

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  1. Hidenori Yahiro
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  2. Yukari Eguchi
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  3. Koichi Eguchi
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  4. Hiromichi Arai
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Yahiro, H., Eguchi, Y., Eguchi, K. et al. Oxygen ion conductivity of the ceria-samarium oxide system with fluorite structure. J Appl Electrochem 18, 527–531 (1988). https://doi.org/10.1007/BF01022246

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  • DOI: https://doi.org/10.1007/BF01022246

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