The electrical conductivities and oxygen permeation properties of Pr 2 Ni 0.75 Cu 0.25 Ga 0.05 O 41d were measured by conventional DC four-probe method with Pt electrode and gas chromatography. The total conductivities increased with an apparent slope › log s › log p O 2 of 1/6, satisfied by the charge neutrality condition at the p-type regime of p ¼ 2½O 00 i . A tubular-type, asymmetric, mixed-conducting oxygen separation membrane was fabricated by drain casting method. A microporous, ceramic support was prepared by slurry processing, because the use of a slurry technique and a suspension of dispersed particles provides a lower final porosity and a more homogeneous particle packing than dry-pressing does. The 30 cm long, tubular, porous alumina with a soft surface was successfully prepared by drain casting. The surface SEM images revealed a structure with Int.
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