Electrochemical properties of Cs-substituted CaWO<sub>4</sub> and BaWO<sub>4</sub> oxide ion conductors

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  • Electrochemical properties of Cs-substituted CaWO4 and BaWO4 oxide ion conductors

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High-temperature electrochemical properties of Cs-substituted CaWO4 and BaWO4 have been investigated. When cesium ions are partly substituted for calcium site of Scheelite-type structured CaWO4 to form oxide ion vacancies as Ca1−xCsxWO4−x/2, oxide ion conduction appears at elevated temperatures. This defect structure for the oxide ion conduction is in contrast to the PbWO4-based oxide ion conductor with oxide ion interstitials, Pb1−xLaxWO4+x/2. The measured electric conductivity of Ca1−xCsxWO4−x/2 (x = 0.15) is high as 10−2 Scm−1 at 750°C with the oxide ion transport number relatively close to unity. Essentially the similar results are obtained for the barium analogous system Ba1−xCsxWO4−x/2, although the conductivity is still lower than CaWO4-based system.

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