METAL OXIDE, OXYGEN STORAGE MATERIAL, OXYGEN ABSORPTION AND DESORPTION APPARATUS, OXYGEN ABSORPTI

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An oxygen-deficient perovskite-type metal oxide represented by formula (I). (I) : (Ba4-x1Ca1-y1Fe3-z1M1x1+y1+z1)O9.5+δ1a (in formula (I), M1 represents at least one element selected from the group consisting of an alkali metal, an alkaline earth metal other than Ba or Ca, a rare earth metal, and a transition metal other than Fe, -2.0≤x1≤2.0, 0≤y1≤0.5, -1.5≤z1≤1.5, x1+y1+z1≥0, and -1.5≤δ1a≤4.5.)