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Title: Structure and magnetism in rare earth strontium-doped cobaltates
Authors: James, M
Morales, L
Wallwork, KS
Avdeev, M
Withers, RL
Goossens, DJ
Keywords: Neutron diffraction
Phase diagrams
Cubic lattices
Doped materials
Rare earth compounds
Solid oxide fuel cells
X-ray diffraction
Issue Date: 15-Nov-2006
Publisher: Elsevier
Citation: James, M., Morales, L., Wallwork, K., Avdeev, M., Withers, R., & Goossens, D. (2006). Structure and magnetism in rare earth strontium-doped cobaltates. Paper presented at the Eighth International Conference on Neutron Scattering (ICNS 2005), "Neutrons for structure and dynamics - a new era", Sydney, Australia, 27 November to 2 December 2005. In Physica B: Condensed Matter, 385–386(1), 199-201. doi:10.1016/j.physb.2006.05.244
Abstract: Substantial interest has recently been generated by rare earth cobaltate compounds as cathode materials for solid oxide fuel cells. We have synthesised a wide range of single–phase perovskite-based rare earth cobaltates (Ln1−xSrxCoO3−δ) (Ln=La3+–Yb3+). A combination of electron and X-ray diffraction of these phases reveals a complex family of tetragonal and orthorhombic superstructures. The nature of structural and magnetic ordering relies on both cation and oxygen vacancy distribution. Phase boundaries exists between compounds containing large, medium and small rare earths (between Nd3+ and Sm3+, and also between Gd3+ and Dy3+) and also at different Sr-doping levels. Powder neutron diffraction has been used in conjunction with the other techniques to reveal cation and oxygen vacancy ordering within these materials. These phases show mixed valence (3+/4+) cobalt oxidation states that increases with Sr content. A range of magnetic behaviours has been observed, including ordered antiferromagnetism at elevated temperatures (>300 K) in Ho0.2Sr0.8CoO2.75. © 2006 Elsevier B.V.
Description: Physical copy held by ANSTO Library at DDC 539.7213/3. Part I
ISSN: 0921-4526
Appears in Collections:Journal Articles

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