aDepartment of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway bStatoil Research Centre, Trondheim, Norway Received 23 August 2006; revised 22 January 2007; accepted 20 February 2007. Available online 30 March 2007.
Compositions in the system La1−xSrxFe1−yMyO3−δ (M = Cr, Ti) where 0.2< x <0.8 and 0.2 < yTi < 0.5 and 0.1 < yCr < 0.3 were investigated to determine their suitability as oxygen membrane materials. Oxygen flux was measured as well as electrical conductivity, thermal and chemical expansion and chemical reactivity with zirconia. The microstructures of all samples were analyzed before and after flux measurements. High oxygen flux values and electrical conductivities were observed for compositions with high Sr and Fe contents, while greater stability and lower thermal and chemical expansivity were observed for compositions with lower Sr contents and Ti substituted on B-site.
Keywords: Oxygen flux; Perovskites; Chemical stability
Corresponding author. Tel.: +47 97108469. 1 Current address: SINTEF Materials and Chemistry, P.O. Box 124 Blindern, 0314 Oslo, Norway.