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Gillie, Lisa
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Publications (6/6 displayed)
- 2024Composition-dependent morphologies of CeO2 nanoparticles in the presence of Co-adsorbed H2O and CO2citations
- 2022Structure and Properties of Cubic PuH2 and PuH3citations
- 2004Crystallographic and magnetic structures of Y₀.₈Sr₂.₂Mn₂GaO₈-ɗ : a new vacancy-ordered perovskite structurecitations
- 2003Synthesis and Characterisation of the Reduced Double-Layer Manganite Sr₃Mn₂O₆₊xcitations
- 2002Staged fluorine insertion into manganese oxides with Ruddlesden-Popper structures:LaSrMnO4F and La1.2Sr1.8Mn2O7Fcitations
- 2002Synthesis and characterisation of reduced single layer manganite Sr₂MnO₃.₅₊xcitations
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article
Crystallographic and magnetic structures of Y₀.₈Sr₂.₂Mn₂GaO₈-ɗ : a new vacancy-ordered perovskite structure
Abstract
The anion-deficient perovskite Y0.8Sr2.2Mn2GaO8-delta (where delta similar to 0.1) has been synthesised and the crystal and magnetic structures determined by Rietveld analysis of neutron powder diffraction (NPD) data. The material has body-centred tetragonal symmetry (14/mmm, a = 7.6373(3) Angstrom and c = 15.6636(10) Angstrom) and consists of alternating layers of octahedral and tetrahedral polyhedra, the layers being perpendicular to [001]. The octahedral layers are preferentially occupied by manganese and the tetrahedral layers are a mixture of manganese and gallium. The precise cation distribution depends critically on preparative conditions. An unusual structural feature of these materials is the arrangement of oxygen vacancies in the tetrahedral layers: in the basic structure, isolated squares of corner-linked tetrahedra are formed instead of the chains that are observed in brownmillerite phases. Additional oxide ions in this layer probably allow the Mn ions to achieve distorted square pyramidal coordination. Low temperature NPD and magnetisation data indicate antiferromagnetic ordering below 100 K. (C) 2003 Elsevier Ltd. All rights reserved.