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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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de Laune, Benjamin P., Whitaker, Mariana J., Marco, Jose F., Thomas, Michael F., Berry, Frank J., Lees, Martin R. and Greaves, Colin (2017) Synthesis and magnetic characterisation of Fe1−xMgxSb2O4 (x = 0.25, 0.50, 0.75) and their oxygen-excess derivatives, Fe1−xMgxSb2O4+y. Journal of Materials Chemistry C, 5 (20). pp. 4985-4995. doi:10.1039/C7TC01256J ISSN 2050-7526.
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WRAP-synthesis-magnetic-characterisation-Fe1-Lees-2017.pdf - Accepted Version - Requires a PDF viewer. Download (3159Kb) | Preview |
Official URL: http://dx.doi.org/10.1039/C7TC01256J
Abstract
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.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QC Physics | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Library of Congress Subject Headings (LCSH): | Iron compounds -- Magnetic properties, Magnesium compounds -- Magnetic properties, Antimony compounds -- Magnetic properties | ||||||
Journal or Publication Title: | Journal of Materials Chemistry C | ||||||
Publisher: | Royal Society of Chemistry | ||||||
ISSN: | 2050-7526 | ||||||
Official Date: | 5 May 2017 | ||||||
Dates: |
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Volume: | 5 | ||||||
Number: | 20 | ||||||
Page Range: | pp. 4985-4995 | ||||||
DOI: | 10.1039/C7TC01256J | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Copyright Holders: | The Royal Society of Chemistry | ||||||
Date of first compliant deposit: | 15 June 2017 | ||||||
Date of first compliant Open Access: | 5 May 2018 | ||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), Spain. Ministerio de Economía y Competitividad [Ministry of Economy and Competitiveness] (MINECO), Advantage West Midlands (AWM), European Regional Development Fund (ERDF) | ||||||
Grant number: | EP/L014114/1 (EPSRC), MAT2015-64110-C2-1-P (MINECO) |
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