Microstructure evolution and oxidation states of Co in perovskite-type oxide Ba1.0Co0.7Fe0.2Nb0.1O3-γ annealed in CO2 atmosphere-中国期刊网

摘要 Ba1.0Co0.7Fe0.2Nb0.1O3-δ(BCFN)oxidewithperovskitecubicstructurewassynthesizedbysolidstatereactionmethod.CO2corrosionofBCFNmembranewasinvestigatedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),diffusereflectanceinfraredFouriertransformedspectroscopy(DRIFT)andX-rayabsorptionfinestructurespectroscopy(XAFS).Cobalt(Co)K-edgeabsorptionspectraofBCFNannealedinCO2revealthattheoxidationstatesofCoinallthesampleswerelargerthan+3andtheydecreasedwiththeincreaseofcalcinationtime.At800℃,1%CO2introducedintoHecouldspeedupthereductionofCocationsincomparisonwithpureHe.Inaddition,sulfateionsinthebulkofBCFNmembranepreferredtomigratetothesurfaceunderCO2calcinationandformmonoclinicBa(CO3)0.9(SO4)0.1besidesorthorhombicwitherite.Moreover,SEMresultsindicatethatthenucleationandgrowthofcarbonatesgrainsstartedatthegrainboundaryofthemembrane.

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Microstructure evolution and oxidation states of Co in perovskite-type oxide Ba1.0Co0.7Fe0.2Nb0.1O3-γ annealed in CO2 atmosphere

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Microstructure evolution and oxidation states of Co in perovskite-type oxide Ba1.0Co0.7Fe0.2Nb0.1O3-γ annealed in CO2 atmosphere

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