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Aubin-Chevaldonnet, V., Deniard, P., Evain, M., Leinekugel-Le-Cocq-Errien, A. Y., Jobic, S., Caurant, D., Petricek, V. & Advocat, T. (2007) Incommensurate modulations in a hollandite phase Ba-x(Al,Fe)(2x)Ti8-2xO16 intended for the storage of radioactive wastes: a (3+1) dimension structure determination. Z. Kristall. 222 383–390.
Added by: Laurent Cournède (2016-03-10 22:02:31) |
| Type de référence: Article DOI: 10.1524/zkri.2007.222.8.383 Numéro d'identification (ISBN etc.): 0044-2968 Clé BibTeX: AubinChevaldonnet2007 Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: cesium, crystals, lattice, Stability Créateurs: Advocat, Aubin-Chevaldonnet, Caurant, Deniard, Evain, Jobic, Leinekugel-Le-Cocq-Errien, Petricek Collection: Z. Kristall. |
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Intensive researches on specific treatments of radioactive cesium, occurring in high level nuclear wastes, are in progress in France. Nowadays, a cesium immobilization in host matrices with a high chemical durability seems to be the favourite option. In that perspective, titanium based upon hollandite is a good candidate as a host matrix because of its high cesium incorporation ability, its excellent chemical stability, and its capacity to support charge compensation during the Cs+ into Ba2+ transmutation process. In this study we report the preparation and crystal growth in a BaF2-B2O3 flux melt of the BaxCsyMzTi8-zO16 hollandite phase and its characterization by single crystal X-ray diffraction. An attention was focused on materials with M = Al or Al + Fe and with barium only since single crystals including cesium could not be obtained from the flux method. An incommensurate modulation of the Ba cation site occupancy, with I4/m(00 gamma)00 as a superspace group, was observed for all the single crystals under study.
Added by: Laurent Cournède |