It was investigated that the effects of preparation methods and conditions for SrFeCo0.5Ox dense membrane on their oxygen permeability. Three different methods, a solid-state reaction method, an evaporation-to-dryness method, and a combined citrate and EDTA complexing method, were applied for the preparation of parent powder. The oxygen flux through membrane at 900 degreesC was increased in the order listed above. The oxygen flux could be greatly improved by repeated calcination and grinding of parent powder. The membrane sintered at a temperature as high as 1200 degreesC showed a higher oxygen flux (0.22 cm(3) (STP)/cm(2) min). (C) 2003 Elsevier Science B.V. All rights reserved.