High temperature X-ray diffraction and thermo-gravimetrical analysis of the cubic perovskite Ba0.5Sr0.5Co0.8Fe0.2O3−δ under different atmospheres

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dc.contributor.authorSahini, M. G.
dc.contributor.authorTolchard, J. R.
dc.contributor.authorWiik, K.
dc.contributor.authorGrande, T.
dc.date.accessioned2023-05-23T12:00:57Z
dc.date.available2023-05-23T12:00:57Z
dc.date.issued2015
dc.descriptionAbstract. Full text article available at https://doi.org/10.1039/C4DT03963Gen_US
dc.description.abstractBa0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) with the cubic perovskite structure is known to be metastable at low temperature under an oxidizing atmosphere. Here, the thermal and chemical expansion of BSCF were studied by in situ high temperature powder X-ray diffraction and thermo-gravimetrical analysis (TGA) in partial pressure of oxygen ranging from an inert atmosphere (∼10−4 bar) to 10 bar O2. The BSCF powder, heat treated at 1000 °C and quenched to ambient temperature prior to the analysis, was shown to oxidize under an oxidizing atmosphere before thermal reduction took place. With decreasing partial pressure of oxygen the initial oxidation was suppressed and only reduction of Co/Fe and loss of oxygen were observed under an inert atmosphere. The thermal expansion of BSCF under different atmospheres was determined from the thermal evolution of the cubic unit cell parameter, demonstrating that the thermal expansion of BSCF depends on the atmosphere. Chemical expansion of BSCF was also estimated based on the diffraction data and thermo-gravimetrical analysis. A hexagonal perovskite phase, coexisting with the cubic BSCF polymorph, was observed to be formed above 600 °C during heating. The phase separation leading to the formation of the hexagonal polymorph was driven by oxidation, and the unit cell of the cubic BSCF was shown to decrease with increasing amounts of the hexagonal phase. The hexagonal phase disappeared upon further heating, accompanied with an expansion of the unit cell of the cubic BSCF.en_US
dc.identifier.citationSahini, M. G., Tolchard, J. R., Wiik, K., & Grande, T. (2015). High temperature X-ray diffraction and thermo-gravimetrical analysis of the cubic perovskite Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3− δ under different atmospheres. Dalton Transactions, 44(23), 10875-10881.en_US
dc.identifier.otherDOI:https://doi.org/10.1039/C4DT03963G
dc.identifier.urihttp://hdl.handle.net/20.500.12661/3859
dc.language.isoenen_US
dc.publisherRoyal Society of Chemistryen_US
dc.subjectCubic perovskiteen_US
dc.subjectHigh temperature X-rayen_US
dc.subjectBSCF powderen_US
dc.subjectX-ray diffractionen_US
dc.subjectThermo-gravimetrical analysisen_US
dc.subjectOxidizing atmosphereen_US
dc.subjectTemperatureen_US
dc.subjectAtmosphereen_US
dc.subjectThermal expansionen_US
dc.titleHigh temperature X-ray diffraction and thermo-gravimetrical analysis of the cubic perovskite Ba0.5Sr0.5Co0.8Fe0.2O3−δ under different atmospheresen_US
dc.typeArticleen_US
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