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Leinekugel-le-Coeq, A. Y., Deniard, P., Jobic, S., Cerny, R., Bart, F. & Emerich, H. (2006) Synthesis and characterization of hollandite-type material intended for the specific containment of radioactive cesium. J. Solid State Chem. 179 3196–3208.
Added by: Florent Boucher (2016-05-12 13:21:36) |
| Type de référence: Article DOI: 10.1016/j.jssc.2006.05.04 Numéro d'identification (ISBN etc.): 0022-4596 Clé BibTeX: LeinekugelleCoeq2006 Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: hollandite structure, nuclear waste, resonant XRD, Rietveld refinement, symmetry distortion, X-ray diffraction Créateurs: Bart, Cerny, Deniard, Emerich, Jobic, Leinekugel-le-Coeq Collection: J. Solid State Chem. |
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| Résumé |
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The hollandite Ba1Cs0.28Fe0.82Al1.46Ti5.72O16, which has been proposed for the cesium-specific conditioning, can be synthesized either by an alcoxyde or a dry route. In both cases, a two-step protocol is applied, i.e., a calcination at 1000 degrees C followed by a sintering at 1200 degrees C. After sintering, both synthetic processes lead to a tetragonal form. According to the X-ray diffraction (XRD) patterns collected at the barium and the cesium K absorption edges, the different positions of these two elements have been evidenced with a more centered position in the oxygen cubic site of the tunnel for Ba than for Cs. On the contrary, after calcination, the two synthetic routes yield different products. The alcoxyde route gives rise to a mixture of the aforementioned Cs- and Ba-containing tetragonal I4/m hollandite, a Cs-only-containing monoclinic I2/m hollandite and an unidentified phase with a weak coherence length containing only Ba. The dry route yields a single tetragonal hollandite material containing Ba and Cs slightly different in composition from the targeted compound. (c) 2006 Elsevier Inc. All rights reserved.
Added by: Florent Boucher |