Site Occupancy Determination in Th 2 Zn 17 - and TbCu 7 -types Sm 2 Fe 17– x Co x Compounds using Synchrotron Resonant Diffraction
| Autor: | Erik Elkaim, Karine Provost, Jean-Marc Joubert, Thomas Bartoli, Valérie Paul-Boncour, Jacques Moscovici, Lotfi Bessais, Judith Monnier |
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| Přispěvatelé: | Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
Diffraction [PHYS]Physics [physics] 010405 organic chemistry Rietveld refinement chemistry.chemical_element Thermal treatment 010402 general chemistry 01 natural sciences Synchrotron 0104 chemical sciences law.invention Inorganic Chemistry Crystallography Transition metal chemistry law Mössbauer spectroscopy Physical and Theoretical Chemistry Cobalt Earth (classical element) ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Inorganic Chemistry Inorganic Chemistry, American Chemical Society, 2021, 60 (3), pp.1533-1541. ⟨10.1021/acs.inorgchem.0c02884⟩ |
| ISSN: | 0020-1669 1520-510X |
| DOI: | 10.1021/acs.inorgchem.0c02884⟩ |
| Popis: | Sm2Fe17 compounds are high-performance permanent magnets. Cobalt substitution allows us to further improve their magnetic properties. Depending on the thermal treatment, cobalt-substituted compounds can be synthesized either in the TbCu7 (disordered) or in the Th2Zn17 (ordered) structure type. Rietveld refinement of the number of transition metal dumbbells replacing rare-earth atoms from synchrotron powder diffraction data shows that the TbCu7 disordered structure has the same composition as the ordered one (a transition metal-to-rare earth ratio of 8.5). Then, cobalt site occupancies have been determined in both structures using synchrotron resonant (anomalous) diffraction. Cobalt is found to be absent from the dumbbell sites. The diffraction results are confirmed by Mossbauer spectroscopy. |
| Databáze: | OpenAIRE |
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