Structure and magnetic properties of the cubic oxide fluoride BaFeO2F

✍ Scribed by Frank J. Berry; Fiona C. Coomer; Cathryn Hancock; Örn Helgason; Elaine A. Moore; Peter R. Slater; Adrian J. Wright; Michael F. Thomas

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 440 KB
• Volume: 184
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2011.04.011

✦ Synopsis

Fluorination of the parent oxide, BaFeO 3 À d, with polyvinylidine fluoride gives rise to a cubic compound with a ¼ 4.0603(4) Å at 298 K. 57 Fe M össbauer spectra confirmed that all the iron is present as Fe 3 þ . Neutron diffraction data showed complete occupancy of the anion sites, indicating a composition BaFeO 2 F, with a large displacement of the iron off-site. The magnetic ordering temperature was determined as T N ¼ 645 7 5 K. Neutron diffraction data at 4.2 K established G-type antiferromagnetism with a magnetic moment per Fe 3 þ ion of 3.95 m B . However, magnetisation measurements indicated the presence of a weak ferromagnetic moment that is assigned to the canting of the antiferromagnetic structure. 57 Fe M össbauer 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.