The perovskite-type oxides, La1−xSrxFe0.5Mn0.5O3−d and Sr1−wFeyMn1−yO3−x, were synthesized and investigated regarding their electrical conductivity and O permeability. La1−xSrxFe0.5Mn0.5O3−d for x = 0 to 0.5 exhibited semiconducting behavior below 400C and all the compounds exhibited metallic behavior above 500C, indicating electronic conduction. Increase of Sr content for La1−xSrxFe0.5Mn0.5O3−d and Fe3+/Mn4+ ratio for SrFeyMn1−yO3−d led to increase in O vacancies in the perovskite lattice and enhanced O permeability. Introduction of cation vacancies also enhanced the permeability of Sr1−wFe0.8Mn0.2O3−d and Sr0.8Fe0.8Mn0.2O3−d had the highest O permeation rate of the compounds synthesized in this work.

Synthesis and Oxygen Permeability of the Perovskite-Type Oxides in the La–Sr–Fe–Mn–O System. S.Kato, D.Kikawa, M.Ogasawara, Y.Moriya, M.Sugai, S.Nakata: Solid State Ionics, 2005, 176[15-16], 1377-81