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Segni, R., Allah, N., Vieille, L., Taviot-Gueho, C. & Leroux, F. (2006) Hydrocalumite-type materials: 2. Local order into Ca2Fe(OH)(6)(Cr-4(2)-)(0.5)center dot nH(2)O in temperature studied by X-ray absorption and Mossbauer spectroscopies. J. Phys. Chem. Solids, 67 1043–1047. 
Added by: Florent Boucher (2016-05-12 13:21:37)
Type de référence: Article
DOI: 10.1016/j.jpcs.2006.01.023
Numéro d'identification (ISBN etc.): 0022-3697
Clé BibTeX: Segni2006
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Catégories: ST2E
Mots-clés: compound, friedels salt, Inorganic compounds, layered double hydroxides, powder diffraction, thermal-behavior, valence, X-ray diffraction, xafs
Créateurs: Allah, Leroux, Segni, Taviot-Gueho, Vieille
Collection: J. Phys. Chem. Solids
Consultations : 9/358
Indice de consultation : 1%
Indice de popularité : 0.25%
Résumé     
Local order around the cations Fe into Ca2Fe(OH)(6)(CrO42-)(0.5)center dot nH(2)O is studied by XAS and Mossbauer spectroscopies. The hydrocalumite phase Ca2Fe(OH)(6)(CrO42-)(0.5)center dot nH(2)O presents a Mossbauer spectrum which is refined with two distinct sites Fe3+, and two different distances Fe-Ca are necessary for the refinement of the XAS fine structure at Fe K edge. Upon calcination up to 250 degrees C where the inorganic phase turns amorphous, the cations Fe3+ is found to change from octahedrally to tetrahedrally coordinated. The corresponding isomeric shift (IS) is shifted from 0.35 to 0.2 mm/s, accompanied with an increase of the quadrupolar splitting. This is corroborated by a change observed on the absorption edge. Conversely, the local environment of the interlayered chromate oxoanions is unmodified in this range of temperature. (c) 2006 Elsevier Ltd. All rights reserved.
Added by: Florent Boucher  
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