Abstract
CaZrO 3-based ceramics, in which trivalent cations such as In, Ga and Sc were substituted for Zr, were synthesized. Proton conduction in these oxides was investigated using some electrochemical methods under various conditions at high temperature. These ceramics showed proton and hole mixed conduction in water vapor containing atmosphere. Hydrogen concentration cell using these oxides as a solid electrolyte showed stable EMF which was close to theoretical value. Proton could electrochemically permeate through these ceramics according to Faraday's law. The charge carrier of these ceramics is proton and their transport number is almost unity in hydrogen atmosphere.
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