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:	Bartoli T; Univ Paris Est Créteil, CNRS, ICMPE, UMR 7182, 2 rue Henri Dunant, 94320 Thiais, France., Joubert JM; Univ Paris Est Créteil, CNRS, ICMPE, UMR 7182, 2 rue Henri Dunant, 94320 Thiais, France., Provost K; Univ Paris Est Créteil, CNRS, ICMPE, UMR 7182, 2 rue Henri Dunant, 94320 Thiais, France., Elkaim E; SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France., Paul-Boncour V; Univ Paris Est Créteil, CNRS, ICMPE, UMR 7182, 2 rue Henri Dunant, 94320 Thiais, France., Monnier J; Univ Paris Est Créteil, CNRS, ICMPE, UMR 7182, 2 rue Henri Dunant, 94320 Thiais, France., Moscovici J; Univ Paris Est Créteil, CNRS, ICMPE, UMR 7182, 2 rue Henri Dunant, 94320 Thiais, France., Bessais L; Univ Paris Est Créteil, CNRS, ICMPE, UMR 7182, 2 rue Henri Dunant, 94320 Thiais, France.
Jazyk:	angličtina
Zdroj:	Inorganic chemistry [Inorg Chem] 2021 Feb 01; Vol. 60 (3), pp. 1533-1541. Date of Electronic Publication: 2021 Jan 13.
DOI:	10.1021/acs.inorgchem.0c02884
Abstrakt:	Sm 2 Fe 17 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 TbCu 7 (disordered) or in the Th 2 Zn 17 (ordered) structure type. Rietveld refinement of the number of transition metal dumbbells replacing rare-earth atoms from synchrotron powder diffraction data shows that the TbCu 7 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 Mössbauer spectroscopy.
Databáze:	MEDLINE
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