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• W2054253011 abstract "Abstract The oxygen permeability of mixed-conducting Sr 1− x Ca x Fe 1− y Al y O 3− δ ( x =0–1.0; y =0.3–0.5) ceramics at 850–1000 °C, with an apparent activation energy of 120–206 kJ/mol, is mainly limited by the bulk ionic conduction. When the membrane thickness is 1.0 mm, the oxygen permeation fluxes under p O 2 gradient of 0.21/0.021 atm vary from 3.7×10 −10  mol s −1  cm −2 to 1.5×10 −7  mol s −1  cm −2 at 950 °C. The maximum solubility of Al 3+ cations in the perovskite lattice of SrFe 1− y Al y O 3− δ is approximately 40%, whilst the brownmillerite-type solid solution formation range in Sr 1− x Ca x Fe 0.5 Al 0.5 O 3− δ system corresponds to x >0.75. The oxygen ionic conductivity of SrFeO 3 -based perovskites decreases moderately on Al doping, but is 100–300 times higher than that of brownmillerites derived from CaFe 0.5 Al 0.5 O 2.5+ δ . Temperature-activated character and relatively low values of hole mobility in SrFe 0.7 Al 0.3 O 3− δ , estimated from the total conductivity and Seebeck coefficient data, suggest a small-polaron mechanism of p-type electronic conduction under oxidising conditions. Reducing oxygen partial pressure results in increasing ionic conductivity and in the transition from dominant p- to n-type electronic transport, followed by decomposition. The low- p O 2 stability limits of Sr 1− x Ca x Fe 1− y Al y O 3− δ seem essentially independent of composition, varying between that of LaFeO 3− δ and the Fe/Fe 1− γ O boundary. Thermal expansion coefficients of Sr 1− x Ca x Fe 1− y Al y O 3− δ ceramics in air are 9×10 −6  K −1 to 16×10 −6  K −1 at 100–650 °C and 12×10 −6  K −1 to 24×10 −6  K −1 at 650–950 °C. Doping of SrFe 1− y Al y O 3− δ with aluminum decreases thermal expansion due to decreasing oxygen nonstoichiometry variations." @default.
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• W2054253011 date "2005-04-01" @default.
• W2054253011 modified "2023-09-26" @default.
• W2054253011 title "Oxygen ionic transport in SrFe1−yAlyO3−δ and Sr1−xCaxFe0.5Al0.5O3−δ ceramics" @default.
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• W2054253011 doi "https://doi.org/10.1016/j.jeurceramsoc.2004.03.011" @default.
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