Oxygen semi-permeation through La(1−x)SrxFe(1−y)GayO3−δ membranes was measured under various oxygen partial pressure gradients from 973 to 1273K, and compared with the values obtained by isotopic oxygen exchange depth experiments. Those results led to a better understanding of the oxygen transport through the membrane and the influence of Sr and Ga amounts on oxygen semi-permeation through the membrane. The influence of Ga amount was not limited to the improvement of dimensional stabilities but it also increases oxygen diffusion and surface exchange kinetic. This work suggested that La0.6Sr0.4Fe0.6Ga0.4O3−δ perovskite was a very good compromise for membrane reactor materials and opens new perspectives on membrane architecture development.

Oxygen Semi-Permeation, Oxygen Diffusion and Surface Exchange Coefficient of La(1−x)SrxFe(1−y)GayO3−δ Perovskite Membranes. P.M.Geffroy, J.M.Bassat, A.Vivet, S.Fourcade, T.Chartier, P.Del Gallo, N.Richet: Journal of Membrane Science, 2010, 354[1-2], 6-13