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Structure and magnetic properties of the cubic oxide fluoride BaFeO2F

Berry, F and Coomer, F and Hancock, Cathryn and Helgason, O and Moore, E and Slater, Peter.R. and Wright, A and Thomas, M. K. (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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URL of Published Version: http://www.sciencedirect.com/science/article/pii/S0022459611001794

Identification Number/DOI: 10.1016/j.jssc.2011.04.011

Fluorination of the parent oxide, BaFeO3- δ, with polyvinylidine fluoride gives rise to a cubic compound with a = 4.0603(4) Å at 298K. 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±5K. Neutron diffraction data at 4.2K established G-type antiferromagnetism with a magnetic moment per Fe3+ ion of 3.95μB. However, magnetisation measurements indicated the presence of a weak ferromagnetic moment which is assigned to the canting of the antiferromagnetic structure. 57Fe Mössbauer spectra in the temperature range 10 to 300K were fitted with a model of fluoride ion distribution that retains charge neutrality of the perovskite unit cell

Type of Work:Article
Date:2011 (Publication)
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemistry
Keywords:perovskite, iron, fluorination
Subjects:QD Chemistry
Institution:University of Birmingham
Copyright Holders:Elsevier
ID Code:1155
Refereed:YES
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