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Ionic conductivity ageing behaviour of 10 mol.% Sc2O3–1 mol.% CeO2–ZrO2 ceramics

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Abstract

The long-term ionic conductivity behaviour of samples of zirconia co-doped with 10 mol.% of Sc2O3 and 1 mol.% CeO2 is evaluated in oxidizing and reducing atmospheres at 600 °C. After 3,000 h, the sample kept in reducing atmospheres exhibits 20% loss in the ionic conductivity, while the sample kept in air shows 6% degradation. No phase transitions were observed in the samples after both the ageing studies. The main contribution towards the loss in the ionic conductivity of the sample kept in air comes from grain boundaries; however, for the sample aged in reducing conditions, both grain and grain boundary contribute similarly towards the increase in the total resistivity. This is tentatively explained by the reduction of Ce4+ cations, dissolved in the fluorite lattice of ZrO2.

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Acknowledgements

Waqas Bin Najib, formerly Ph. D. student at this Division, is thanked for preparation of samples and initiation of the ageing studies. This work has been supported by the EU, within the integrated project SOFC600, Demonstration of SOFC stack technology for operation at 600 °C, Project Ref. 20089.

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  1. Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark—DTU, Roskilde, 4000, Denmark

    Shobit Omar & Nikolaos Bonanos

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  1. Shobit Omar
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  2. Nikolaos Bonanos
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Correspondence to Shobit Omar.

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Omar, S., Bonanos, N. Ionic conductivity ageing behaviour of 10 mol.% Sc2O3–1 mol.% CeO2–ZrO2 ceramics. J Mater Sci 45, 6406–6410 (2010). https://doi.org/10.1007/s10853-010-4723-x

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  • DOI: https://doi.org/10.1007/s10853-010-4723-x

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