Oxygen Permeating Properties of the Mixed Conducting Membranes without Cobalt

A new series of mixed conducting oxides, Sr10−n/2BinFe20Om (n = 4, 6, 8, 10), were synthesized by a solid state reaction method, and they have high oxygen permeability. The oxygen permeation rate at 1150 K is 0.41 ml(STD)/cm2·min for n = 6 and 0.90 ml(STD)/cm2·min for n = 10, which is two times higher than that for Sr1−xBixFeO3 (x = 0.5). For the Sr1−xBixFeO3 (x = 0.1, 0.3, 0.5) series, the oxygen flux increases with increasing Bi content.