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Título: | Characterization of the Mn-Li ferrite system Li1-0.5xFe1.5x+1-Mn1-xO4 (0.2 ≤ x ≤ 1) |
Autor: | Gracia, Mercedes CSIC ; Marco, J.F. CSIC ORCID CVN ; Gancedo, J. R. CSIC; Gautier, J.L.; Ríos, Edmundo I.; Menéndez, Nieves; Tornero, Jesús | Fecha de publicación: | 2003 | Editor: | Royal Society of Chemistry (UK) | Citación: | Journal of Materials Chemistry 13: 844-851 (2003) | Resumen: | The Mn–Li ferrite system Li1−0.5xFe1.5x+1Mn1−xO4 (x = 1, 0.8, 0.6, 0.4, 0.2) has been studied by means of X-ray diffraction, Mössbauer spectroscopy and Mn K- and Fe K-edge XANES/EXAFS. All the samples show the spinel-related structure with the lattice constant a gradually decreasing between a = 0.8310 nm (x = 1) and a = 0.8301 nm (x = 0.2). Mössbauer and Fe K-edge XANES/EXAFS results have shown that the oxidation state of Fe is +3 and that the fractions of Fe3+ ions occupying the octahedral and tetrahedral sublattices do not change significantly along the series. Mössbauer data recorded under applied magnetic field indicate the existence in the Mn-containing samples of canted spin structures for the Fe3+ ions on both the tetrahedral and octahedral sites, the canting angle being larger for the octahedral sublattice. Mn K-edge XANES and EXAFS have shown Mn to be present as Mn3+ and Mn4+ and to occupy only octahedral sites. The XANES/EXAFS results have also shown that the Mn4+/Mn3+ ratio increases with increasing Li/Mn content. The results indicate that as the extent of Li/Mn insertion increases the new inserted Li+ ions occupy tetrahedral sites and that some of the Li+ ions initially occupying octahedral sites are also driven into tetrahedral positions. | Versión del editor: | http://dx.doi.org/10.1039/b212474b | URI: | http://hdl.handle.net/10261/332200 | DOI: | 10.1039/b212474b | ISSN: | 0959-9428 |
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