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Electrochemical Properties of Cs and La Co-doped CaWO₄ Oxide Ion Conductor

Takai, Shigeomi Takemoto, Ryo Yabutsuka, Takeshi Yao, Takeshi 京都大学 DOI:10.5796/electrochemistry.21-00121

2022.02

概要

To clarify the contribution of defect structure of CaWO₄-based system on the oxide ion conduction properties, we doped both cesium and lanthanum ions into CaWO₄ as Ca₀.₉CsxLa₀.₁−xWO₄.₀₅−x. Scheelite-type structured solid solution can be obtained for the Cs-rich region (x ≥ 0.05) with oxygen deficiency, while second phase appears for La-rich region (x ≤ 0.025) assuming excess oxide ions. In the present system, a bend in Arrhenius plot of conductivity is observed around 850 °C as the typical CaWO₄-based system even co-doping with La ions. In terms of the compositional dependence, ionic conduction develops from x = 0.05 with the amount of cation vacancy below 800 °C, while the conductivity enhancement starts at the La-rich region above 900 °C. This indicates that not only oxide ion vacancy but also interstitial attribute to the oxide ion conduction at high-temperature, which is also suggested by the activation energy.

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