Orthorhombic superstructures within the rare earth strontium-doped cobaltate perovskites: Ln1−xSrxCoO3−δ (Ln=Y3+, Dy3+–Yb3+; 0.750≤x≤0.875)

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dc.contributor.authorJames, Men_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorBarnes, PRFen_AU
dc.contributor.authorMorales, Len_AU
dc.contributor.authorWallwork, KSen_AU
dc.contributor.authorWithers, RLen_AU
dc.date.accessioned2008-04-24T01:04:45Zen_AU
dc.date.accessioned2010-04-30T05:02:48Zen_AU
dc.date.available2008-04-24T01:04:45Zen_AU
dc.date.available2010-04-30T05:02:48Zen_AU
dc.date.issued2007-08en_AU
dc.date.statistics2007-08en_AU
dc.description.abstractA combination of electron, synchrotron X-ray and neutron powder diffraction reveals a new orthorhombic structure type within the Sr-doped rare earth perovskite cobaltates Ln1−xSrxCoO3−δ (Ln=Y3+, Dy3+, Ho3+, Er3+, Tm3+and Yb3+). Electron diffraction shows a C-centred cell based on a 2√2ap×4ap×4√2ap superstructure of the basic perovskite unit. Not all of these very weak satellite reflections are evident in the synchrotron X-ray and neutron powder diffraction data and the average structure of each member of this series could only be refined based on Cmma symmetry and a 2√2ap×4ap×2√2ap cell. The nature of structural and magnetic ordering in these phases relies on both oxygen vacancy and cation distribution. A small range of solid solution exists where this orthorhombic structure type is observed, centred roughly around the compositions Ln0.2Sr0.8CoO3−δ. In the case of Yb3+ the pure orthorhombic phase was only observed for 0.850≤x≤0.875. Tetragonal (I4/mmm; 2ap×2ap×4ap) superstructures were observed for compositions having higher or lower Sr-doping levels, or for compounds with rare earth ions larger than Dy3+. These orthorhombic phases show mixed valence (3+/4+) cobalt oxidation states between 3.2+ and 3.3+. DC magnetic susceptibility measurements show an additional magnetic transition for these orthorhombic phases compared to the associated tetragonal compounds with critical temperatures > 330K. © 2007, Elsevier Ltd.en_AU
dc.identifier.citationJames, M., Avdeev, M., Barnes, P., Morales, L., Wallwork, K. S., & Withers, R. (2007). Orthorhombic superstructures within the rare earth strontium-doped cobaltate perovskites: Ln1−xSrxCoO3−δ (Ln=Y3+, Dy3+–Yb3+; 0.750≤x≤0.875). Journal of Solid State Chemistry, 180(8), 2233-2247. doi:10.1016/j.jssc.2007.04.029en_AU
dc.identifier.govdoc1177en_AU
dc.identifier.issn0022-4596en_AU
dc.identifier.issue8en_AU
dc.identifier.journaltitleJournal of Solid State Chemistryen_AU
dc.identifier.pagination2233-2247en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jssc.2007.04.029en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1119en_AU
dc.identifier.volume180en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectStrontiumen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectPerovskiteen_AU
dc.subjectPhase diagramsen_AU
dc.subjectOxidesen_AU
dc.subjectHigh spin statesen_AU
dc.subjectFuel cellsen_AU
dc.subjectMagnetic propertiesen_AU
dc.titleOrthorhombic superstructures within the rare earth strontium-doped cobaltate perovskites: Ln1−xSrxCoO3−δ (Ln=Y3+, Dy3+–Yb3+; 0.750≤x≤0.875)en_AU
dc.typeJournal Articleen_AU
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