Mixed conduction and oxygen permeation in the substituted oxides for CaTiO3
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Mixed conduction in substituted perovskite-type oxides CaTi1−xMxO3−α (M=Fe, Co and Ni) was studied by means of electrochemical methods. Of these materials, Fe-substituted oxides showed the highest oxide ion conductivity as well as high electronic conductivity. The oxide ion transport numbers of the oxides were lower than 0.6 over the whole composition range measured in air. Electrochemical oxygen permeation in such a material could be confirmed by gas chromatography. Extraction of oxygen from air was carried out using the mixed conductor. The oxygen extraction rate in this method was higher than that using a silicone film.
KeywordsExtraction Rate Electronic Conductivity Composition Range Electrochemical Method Oxygen Extraction
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