Preparation and electrical properties of a pyrochlore-related Ce2Zr2O8−x phase |
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Authors: | Zhao Hui Guillet Nicolas Valdivieso Franoise Pijolat Michle |
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Institution: | LPMG-CNRS 2021, Centre SPIN, Ecole Nationale Supérieure des Mines, 158 Cours Fauriel, 42023, Saint Etienne, Cedex 2, France |
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Abstract: | A pyrochlore-related Ce2Zr2O8−x phase has been prepared in a reduction reoxidation process from Ce0.5Zr0.5O2 powders. Ce2Zr2O8−x, based on a cubic symmetry with a=1.053 nm, decomposes in nitrogen at 800 °C, but remains stable up to 900 °C in air. It shows mixed oxygen ionic and electronic conductivity. The bulk conductivity at 700 °C is 4×10−4 S cm−1 in air and 1×10−2 S cm−1 in nitrogen, and the activation energy is 1.27 eV in air. In nitrogen, the Arrhenius law is not obeyed, and a curved plot was obtained from 400 to 700 °C; then, the conductivity decreased rapidly due to the thermal decomposition of Ce2Zr2O8−x. |
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Keywords: | Ce0 5Zr0 5O2 Reduction– oxidation Pyrochlore phase Conductivity Cathode |
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