Structure Stability and Oxygen Permeability of Perovskite-type Oxides of Ba0.5Sr0.5Co0.8Fe0.1R0.1O3-δ (R=Al, Mn, Fe, Ce, Cr, Ni, Co)

Perovskite-type Ba0.5Sr0.5Co0.8Fe0.1R0.1O3-delta (R=Al, Mn, Fe, Ce, Cr, Ni, Co) oxide membranes were exploited and synthesized. Oxygen behavior, order-disorder transition and phase stability of these composite oxides were investigated by combined analysis of X-ray diffraction (XRD), temperature programmed desorption (TPD), thermogravimetric-differential thermal analysis (TG-DTA). Oxygen permeation through these membranes was studied by the gas chromatography (GC) method using a high-temperature permeation cell in a wide temperature range from 700 to 950 degrees C. High permeation fluxes were observed for these materials. The high permeation flux was about 3.19 ml center dot min(-1)center dot cm(-2) under air/He gradients at 950 degrees C, which was achieved for Ba0.5Sr0.5Co0.8Fe0.1Ni0.1O3-delta (BSCFNiO) membrane. The results of analysis showed no phase transition for BSCFNiO oxide with increasing temperature and XRD pattern of this material after O-2-TPD indicated to sustain a pure perovskite structure after oxygen permeation process.