Multistep synthesis of the SrFeO2F perovskite oxyfluoride via the SrFeO2 infinite-layer intermediate
| Autor: | Shannon K. Kraemer, Wenli Bi, M. Zhu, Shaun R. Bruno, Viktor V. Poltavets, Colin K. Blakely, E. Ercan Alp, Xianglin Ke, Joshua D. Davis |
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| Rok vydání: | 2014 |
| Předmět: |
Chemistry
Organic Chemistry Inorganic chemistry chemistry.chemical_element Biochemistry Oxygen Soft chemistry Inorganic Chemistry Tetragonal crystal system Crystallography Phase (matter) Mössbauer spectroscopy Fluorine Environmental Chemistry Physical and Theoretical Chemistry Layer (electronics) Perovskite (structure) |
| Zdroj: | Journal of Fluorine Chemistry. 159:8-14 |
| ISSN: | 0022-1139 |
| DOI: | 10.1016/j.jfluchem.2013.12.007 |
| Popis: | The SrFeO 2 F oxyfluoride was prepared through a low temperature, multistep synthetic route starting with the SrFeO 3− x perovskite via the SrFeO 2 infinite layer intermediate phase. In the final step SrFeO 2 F was formed by reacting SrFeO 2 with XeF 2 at 150 °C. In spite of utilizing an intermediate with layered ordering of oxygen vacancies, disordered SrFeO 2 F was synthesized. Rietveld refinement of synchrotron powder diffraction data did not reveal any signs of tetragonal distortion predicted by DFT calculations for SrFeO 2 F with layered O/F ordering. Significantly, the magnetic properties observed are drastically different from those reported earlier in the literature indicating that the properties of O/F disordered phases depend on the degree of short range ordering. Mossbauer spectroscopy measurements revealed the predominance of cis fluorine configuration in FeO 4 F 2 polyhedra, confirming a difference in local Fe coordination in comparison with O/F disordered SrFeO 2 F. |
| Databáze: | OpenAIRE |
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