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 ha
ve high oxygen permeability. The oxygen permeation rate at 1150 K is 0
.41 ml(STD)/ cm(2).min for n = 6 and 0.90 ml(STD)/cm(2).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. (C) 1998 Elsevier Science Ltd.