Structure and magnetic properties of the cubic oxide fluoride BaFeO₂F

Berry, Frank J.; Coomer, Fiona C.; Hancock, Cathryn; Helgason, Őrn; Moore, Elaine A.; Slater, Peter R.; Wright, Adrian J. and Thomas, Michael F. (2011). Structure and magnetic properties of the cubic oxide fluoride BaFeO₂F. Journal of Solid State Chemistry, 184(6), pp. 1361–1366.

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DOI (Digital Object Identifier) Link:	http://dx.doi.org/doi:10.1016/j.jssc.2011.04.011
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Abstract

Fluorination of the parent oxide, BaFeO_{3_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 T_N=645±5 K. Neutron diffraction data at 4.2 K established G-type antiferromagnetism with a magnetic moment per Fe³⁺ ion of 3.95 μ_B. 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.

Item Type:	Journal Article
Copyright Holders:	2011 Elsevier Inc
ISSN:	0022-4596
Funders:	EPSRC
Extra Information:	NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Solid State Chemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Solid State Chemistry, 184(6) 2011 10.1016/j.jssc.2011.04.011
Keywords:	BaFeO2F; Oxide fluoride; Canted antiferromagnet
Academic Unit/Department:	?? scie-dche ?? Science > Life, Health and Chemical Sciences
Item ID:	28818
Depositing User:	Elaine Moore
Date Deposited:	02 Jun 2011 11:35
Last Modified:	23 Oct 2012 21:26
URI:	http://oro.open.ac.uk/id/eprint/28818

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