Synthesis and magnetic characterisation of Fe1-xMgxSb2O4 (x = 0.25, 0.50, 0.75) and their oxygen-excess derivatives, Fe1-xMgxSb2O4+y.

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data http://eprints.org/relation/isVersionOf http://edata.bham.ac.uk/id/document/229600 http://eprints.org/relation/isVolatileVersionOf http://edata.bham.ac.uk/id/document/229600 http://eprints.org/relation/ispreviewThumbnailVersionOf http://edata.bham.ac.uk/id/document/229600 archive 4 disk0/00/00/00/28 2017-05-02 08:20:37 2018-05-25 15:10:10 2018-05-24 14:31:36 dataset show 0 Greaves Colin c.greaves@bham.ac.uk Synthesis and magnetic characterisation of Fe1-xMgxSb2O4 (x = 0.25, 0.50, 0.75) and their oxygen-excess derivatives, Fe1-xMgxSb2O4+y. submitted QD 10col_ephy Three new materials of composition Fe1-xMgxSb2O4 (x = 0.25, 0.50, 0.75) with the tetragonal schafarzikite structure have been synthesised. Magnetic susceptibility measurements suggest that Fe1-xMgxSb2O4 (x = 0.25, 0.50) are canted antiferromagnets whilst Fe0.25Mg0.75Sb2O4 is paramagnetic. The magnetic ordering temperatures decrease as the Mg2+ concentration increases. The materials form oxygen-excess phases when heated in oxygen-rich atmospheres at temperatures of ~ 350 C. 57Fe Mössbauer spectroscopy shows that the oxidation process involves the oxidation of Fe2+ to Fe3+. Powder neutron diffraction confirms the location of the excess oxygen within the structural channels and reveals a change in magnetic order at low temperatures from A-type (magnetic moments along {100}) for Fe1xMgxSb2O4 to C-type (magnetic moments along [001]) for the oxidised materials. The change is attributed to a weakening of the antiferromagnetic exchange interactions between edge-linked FeO6 octahedra for the Fe3+-containing materials. 2017-04-18 submitted University of Birmingham 10.25500/eData.bham.00000028 Dataset research-data@contacts.bham.ac.uk School of Chemistry na na na TRUE