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Cobalt-free perovskite-type oxides Ba Fe1-yTayO3-δ(0 ≤ y ≤ 0.2)were synthesized via a simple solid state reaction.The cubic perovskite structure can be obtained when y is over 0.1.Ba Fe0.9Ta0.1O3-δ(BFT0.1)membrane shows the highest oxygen permeation flux,