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Preparation and electrical properties of a pyrochlore-related Ce2Zr2O8−x phase

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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Submitted on : Monday, July 18, 2011 - 10:34:14 AM
Last modification on : Monday, May 3, 2021 - 11:28:03 AM

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Hui Zhao, Nicolas Guillet, Françoise Valdivieso, Michèle Pijolat. Preparation and electrical properties of a pyrochlore-related Ce2Zr2O8−x phase. Solid State Ionics, Elsevier, 2003, 160 (3-4), pp.317-326. ⟨10.1016/S0167-2738(03)00207-8⟩. ⟨emse-00609089⟩

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