Structure and magnetic properties of the cubic oxide fluoride BaFeO2F

Frank Berry, FC Coomer, Cathryn Hancock, O Helgason, EA Moore, Peter Slater, Adrian Wright, MF Thomas

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42 Citations (Scopus)
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Abstract

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
Original languageEnglish
Pages (from-to)1361-1366
Number of pages6
JournalJournal of Solid State Chemistry
Volume184
Issue number6
DOIs
Publication statusPublished - 1 Jun 2011

Keywords

  • Canted antiferromagnet
  • Oxide fluoride
  • BaFeO2F

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