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Structure and magnetic properties of the cubic oxide fluoride BaFeO2F |
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| Authors: | Frank J Berry Fiona C Coomer Örn Helgason Peter R Slater Michael F Thomas |
| Institution: | a School of Chemistry, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK b Department of Chemistry, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK c Science Institute, University of Iceland, Dunhagi 3, IS-107 Reykjavik, Iceland d Department of Physics, The University of Liverpool, Liverpool L69 3BX, UK |
| Abstract: | Fluorination of the parent oxide, BaFeO3−δ, with polyvinylidine fluoride gives rise to a cubic compound with a=4.0603(4) Å at 298 K. 57Fe Mössbauer spectra confirmed that all the iron is present as Fe3+. Neutron diffraction data showed complete occupancy of the anion sites, indicating a composition BaFeO2F, with a large displacement of the iron off-site. The magnetic ordering temperature was determined as TN=645±5 K. Neutron diffraction data at 4.2 K established G-type antiferromagnetism with a magnetic moment per Fe3+ ion of 3.95 μB. However, magnetisation measurements indicated the presence of a weak ferromagnetic moment that is assigned to the canting of the antiferromagnetic structure. 57Fe Mössbauer spectra in the temperature range 10-300 K were fitted with a model of fluoride ion distribution that retains charge neutrality of the perovskite unit cell. |
| Keywords: | BaFeO2F Oxide fluoride Canted antiferromagnet |
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