OXYGEN EXCESS TYPE METAL OXIDE AND PRODUCTION METHOD THEREFOR, AND OXYGEN CONCENTRATION APPARATUS A

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PROBLEM TO BE SOLVED : To provide novel oxygen excess type metal oxide excellent in oxygen adsorption and desorption speed and having suppressed reduction of oxygen adsorbed amount caused by repeated use, a production method therefor or the like. SOLUTION : There is provided oxygen excess type metal oxide which is represented by a formula (1) and in which peak strength of 103 of a hexagonal structure is smaller than peak strength of 110 and half value width of peak of 103 (FWHM) is 0.3° or more when measured by an X-ray powder diffraction method. AjDkEmGnO7+δ (1), where A is a trivalent rare earth element or Ca, D is one or more kind selected from alkali earth metal elements, E and G are each independently one or more kind selected from oxygen tetracoordination element and at least one kind is a transition metal element, j>0, k>0, each independently m≥0, n≥0, j+k+m+n=6 and 0<δ≤1.5. SELECTED DRAWING : Figure 1 COPYRIGHT : (C)2017, JPO&INPIT