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Castets, A., Carlier, D., Zhang, Y., Boucher, F., Marx, N., Gautier, R., Le Fur, E., Le Polles, L., Croguennec, L. & Menetrier, M. (2012) NMR study of the LiMnPO4 center dot OH and MPO4 center dot H2O (M=Mn, V) homeotypic phases and DFT calculations. Solid State Nucl. Magn. Reson. 42 42–50.
Added by: Laurent Cournède (2016-03-10 21:28:39) |
| Type de référence: Article DOI: 10.1016/j.ssnmr.2011.11.001 Numéro d'identification (ISBN etc.): 0926-2040 Clé BibTeX: Castets2012a Voir tous les détails bibliographiques  |
Catégories: ST2E Mots-clés: DFT calculations, electronic-structure, exchange, Fermi contact, GGA plus U, lifepo4(oh), Lithium battery electrodes, magnetic-structures, MAS NMR, phosphates, powder diffraction, Tavorite Créateurs: Boucher, Carlier, Castets, Croguennec, Gautier, Le Fur, Le Polles, Marx, Menetrier, Zhang Collection: Solid State Nucl. Magn. Reson. |
Consultations : 1/508
Indice de consultation : 3% Indice de popularité : 0.75% |
| Résumé |
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Following our previous work on the tavorite-like LiFePO4 center dot OH and FePO4 center dot H2O phases, we report here the magnetic and NMR characterizations of analogous LiMnPO4 center dot OH, MnPO4 center dot H2O and VPO4 center dot H2O phases together with the DFT calculations of the NMR shifts. The first two compounds exhibit Curie-Weiss type magnetic behavior with Curie constants close to the theoretical ones for HS Mn3+, while the vanadium compound is very close to a pure Curie-type behavior. Li-7, P-31 and H-1 MAS NMR spectra are reported for the three compounds, and show strong Fermi-contact shifts for the first two nuclei, while the sign and magnitude of the H-1 shifts are very different for the three phases. DFT calculations (FLAPW in GCA+U approximation) using the WIEN2k code and the experimental susceptibilities are shown to reproduce closely the experimental data. This situation is compared to the case of the homologous and isostructural Fe compounds, which exhibit much more complex magnetic behaviors. (C) 2011 Elsevier Inc. All rights reserved.
Added by: Laurent Cournède |