Structure and magnetic properties of the cubic oxide fluoride BaFeO sub(2)F

Fluorination of the parent oxide, BaFeO sub(3- delta ), with polyvinylidine fluoride gives rise to a cubic compound with a=4.0603(4) Aa at 298 K. super(57)Fe Moessbauer spectra confirmed that all the iron is present as Fe super(3+). Neutron diffraction data showed complete occupancy of the anion sit...

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Bibliographic Details
Published in:Journal of solid state chemistry 2011-06, Vol.184 (6), p.1361-1366
Main Authors: Berry, Frank J, Coomer, Fiona C, Hancock, Cathryn, Helgason, Oern, Moore, Elaine A, Slater, Peter R, Wright, Adrian J, Thomas, Michael F
Format: Article
Language:English
Subjects:
Antiferromagnetism
Ferromagnetism
Fluorides
Iron
Neutron diffraction
Oxides
Spectra
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Summary:Fluorination of the parent oxide, BaFeO sub(3- delta ), with polyvinylidine fluoride gives rise to a cubic compound with a=4.0603(4) Aa at 298 K. super(57)Fe Moessbauer spectra confirmed that all the iron is present as Fe super(3+). Neutron diffraction data showed complete occupancy of the anion sites, indicating a composition BaFeO sub(2)F, with a large displacement of the iron off-site. The magnetic ordering temperature was determined as T sub(N)=645+/-5 K. Neutron diffraction data at 4.2 K established G-type antiferromagnetism with a magnetic moment per Fe super(3+) ion of 3.95 mu sub(B). However, magnetisation measurements indicated the presence of a weak ferromagnetic moment that is assigned to the canting of the antiferromagnetic structure. super(57)Fe Moessbauer 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. The cubic oxide fluoride of composition BaFeO sub(2)F has been synthesised and characterised.[inline image]
ISSN:0022-4596
DOI:10.1016/j.jssc.2011.04.011