Abstract
Mixed oxygen-ionic and electronic conducting membranes of SrFe(Cu)O 3–δ were prepared by solid-state reaction method. The crystal structure, oxygen nonstoichiometry, and phase stability of the materials were studied by TGA and XRD. Oxygen permeation fluxes through these membranes were studied at operating temperature ranging from 750 to 950 °C. Results showed that doping Cu in SrFeO 3–δ compound had a significant effect on the formation of single-phased perovskite structure. For SrFe 1–xCu xO 3–δ series materials, the oxygen nonstoichiometry and the oxygen permeation flux increased considerably with the increase of Cu-doping content (x = 0.1–0.3). The sintering property of the membrane decreased significantly when the Cu substitution amount reached 40%. SrFe 0.7Cu 0.3O 3–δ showed high oxygen permeation flux, but SrCuO 2 and Sr 2Fe 2O 5 phases formed in the compound after oxygen permeation test induced cracks in the membrane.
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