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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Helgason, O.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2011Structure and magnetic properties of the cubic oxide fluoride BaFeO2Fcitations
- 2008Magnetic order in perovskite-related SrFeO2Fcitations
- 2008Magnetic order in perovskite-related SrFeO<sub>2</sub>F
- 2001Investigation of defect structures formed by doping tetravalent ions into spinel-related iron oxides using atomistic simulation calculationscitations
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article
Magnetic order in perovskite-related SrFeO<sub>2</sub>F
Abstract
Perovskite-related strontium orthoferrite, SrFeO<sub>3-δ</sub>, has been fluorinated by a low temperature reaction with poly(vinylidene fluoride) to give the compound SrFeO<sub>2</sub>F. X-ray powder diffraction shows that fluorination leads to an expansion of the unit cell which is consistent with partial replacement of oxygen by fluorine and consequent reduction in the oxidation state of iron. Magnetometry experiments in the temperature range 10–400 K showed small aligned moments (0.003 ± 0.000 05 μB per Fe<sup>3+</sup> ion at 2 T and 300 K), indicating the absence of ferro- or ferrimagnetism. The <sup>57</sup>Fe Mössbauer spectra recorded at temperatures below about 300 K show broadened, but unsplit, sextet patterns whilst spectra recorded above this temperature show clear splitting of the sextet structure and a magnetic ordering temperature of 685 ± 5 K. A model related to the pattern of substitution by fluorine on the octahedral arrangement of oxygen sites around iron is proposed in which SrFeO<sub>2</sub>F undergoes a magnetic transition at about 300 K from a low temperature state with random spin directions to an antiferromagnetic state.