Ca2AlMnO5+δ with a brownmillerite‐type structure can topotactically store/release a large amount of excess oxygen (about 3.0 wt.%) depending on temperature and the surrounding atmosphere in a highly reversible manner.

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Oxygen Storage Capability of Brownmillerite-Type Ca 2 AlMnO 5+δ and Its Application to Oxygen Enrichment. -Ca2AlMnO5+δ with a brownmillerite-type structure can topotactically store/release a large amount of excess oxygen (about 3.0 wt.%) depending on temperature and the surrounding atmosphere in a highly reversible manner. This may open the possibility of various applications to oxygen-storage technologies such as oxygen enrichment/oxygen separation and cathode materials for solid oxide fuel cells. The oxide consists only of "rock-forming elements" which are abundantly distributed in the earth crust, being quite favorable for large-scale practical applications. -(MOTOHASHI*, T.; HIRANO, Y.; MASUBUCHI, Y.; OSHIMA, K.; SETOYAMA, T.; KIKKAWA, S.; Chem. Mater. 25 (2013) 3, 372-377, http://dx.doi.org/10.1021/cm303156n ; Fac. Eng., Hokkaido Univ., Kita, Sapporo 060, Japan; Eng.) -W. Pewestorf 22-200