Abstract
Perovskite type La0.2Ba0.8Co0.2Fe0.8O3−δ (LBCF) powders were synthesized by modified citrate pyrolysis and LBCF membranes were prepared by isostatic pressing. The oxygen vacancy concentration variation of the LBCF powders becomes substantial above 973 K due to order-disorder transition. The unsteady-steady oxygen permeation flux of the LBCF membrane decreases with time and it takes about 40 min to get the steady state. In the temperature range of 1073–1223 K, the oxygen vacancy diffusivity of the LBCF membrane increases almost a magnitude and the increasing of oxygen permeation flux is mainly attributed to the increasing of oxygen vacancy diffusivity. An in-situ high-temperature X-ray diffraction was used to study the stability of the LBCF membrane, indicating that it has good thermochemical stability at elevated temperatures and low oxygen partial pressures.
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