OXIDE ION CONDUCTOR AND PRODUCTION METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a method for producing ceria based oxide by which ceria based oxide can be produced under milder condition without deteriorating its properties as an oxide ion conductor. SOLUTION: The oxide ion conductor has a composition expressed by the general formula of (CeO2 )1-x (LnO1.5 )x-y (AOz )y (wherein, Ln denotes tervalent rare earth elements other than Ce; and A denotes bivalent, tervalent or tetravalent transition metal elements; and 0