OXYGEN DEFICIT PEROVSKITE-TYPE METAL OXIDE EXCELLENT IN OXYGEN STORAGE CAPABILITY, EXHAUST GAS PURI

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PROBLEM TO BE SOLVED : To provide an inexpensive and practical metal oxide which has sufficient oxygen diffusion ability and oxygen non-stoichiometric property at 500°C or less, is excellent in chemical stability in an high temperature region in the vicinity of 600°C, and has an oxygen storage capability excellent as materials for an exhaust gas purifying catalyst, an oxygen storage material, an oxygen separator, an oxygen remover, an oxygen selector, an oxygen enricher, etc. SOLUTION : The oxygen deficit perovskite-type oxide is represented by formula (1), and is excellent in an oxygen storage capability which is characterized by being operated in a low temperature region of 500°C or less. Formula (1) is expressed by (Ba1-xAx)B(Mn2-yCy)O5+δ, wherein A is one kind or two kinds or more of alkaline earth metals except Ba, B is one kind or two kinds or more of Y, rare earth elements and Ca, C is one kind or two kinds of Fe and Co, x is 0≤x≤1.0, y is 0≤y≤2.0, and δ is 0≤δ≤1.0. COPYRIGHT : (C)2011, JPO&INPIT