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Title: Orthorhombic superstructures within the rare earth strontium-doped cobaltate perovskites: Ln1−xSrxCoO3−δ (Ln=Y3+, Dy3+–Yb3+; 0.750≤x≤0.875)
Authors: James, M
Avdeev, M
Barnes, PRF
Morales, L
Wallwork, KS
Withers, RL
Keywords: Strontium
Neutron diffraction
Phase diagrams
High spin states
Fuel cells
Magnetic properties
Issue Date: Aug-2007
Publisher: Elsevier
Citation: James, 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.2007.04.029
Abstract: A 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.
Gov't Doc #: 1177
ISSN: 0022-4596
Appears in Collections:Journal Articles

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