Dense BaCe0.15Fe0.85O3−δ ceramic membranes, synthesized by using the solid-state reaction method and EDTA-citric acid process, were investigated using X-ray powder diffraction, total conductivity, O permeation methods, etc. The X-ray diffraction results revealed the perovskite structures of powders prepared using the EDTA-citric acid process were easier to develop than those prepared by using the solid-state reaction method. Membranes derived from EDTA-citric acid sources had a higher density, a pure phase structure and fewer defects when compared with those derived from solid-state reaction sources. However, membranes produced using the solid-state reaction method had a higher O permeability. Thickness experiments revealed that the O permeation fluxes of membranes synthesized using either method were all jointly controlled by surface exchange and bulk diffusion in the range of 0.7 to 2.0mm. Long-term O permeation operation revealed that membranes produced using either method exhibited a good O permeation stability.

Effects of Synthesis Methods on Oxygen Permeability of BaCe0.15Fe0.85O3−δ Ceramic Membranes. X.Zhu, Y.Cong, W.Yang: Journal of Membrane Science, 2006, 283[1-2], 158-63