Abstract
Mixed conducting materials have potential for application of the membrane reactor under large chemical potential gradients. A perovskite-related SrFeGa 0.25O 3-δ was prepared by the conventional solid-state reaction and its phase under air, He and 8% H 2 was analyzed by in-situ high-temperature XRD. The perovskite structure in air transformed to orthorhombic brownmillerite at 600 °C in He atmosphere, and to cubic brownmillerite at around 1000 °C. In 8% H 2, the SrFeGa 0.25O 3-δ decomposed into other phases that were completely different from the perovskite and the brownmillerite above 900 °C. The phase decomposition in hydrogen caused a drastic change both in electrical conductivity and surface morphology of the membrane. The electrical and oxygen-transporting characteristics correlated with crystal structure of SrFeGa 0.25O 3-δ were discussed.
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