| Autor: |
Berry, F, Coomer, F, Hancock, Cathryn, Helgason, O, Moore, E, Slater, Peter.R., Wright, A, Thomas, M. K. |
| Jazyk: |
angličtina |
| Rok vydání: |
2011 |
| Předmět: |
|
| Popis: |
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 |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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