Author:
Aubin-Chevaldonnet Virginie,Deniard Philippe,Evain Michel,Leinekugel-Le-Cocq-Errien Aude Ysoline,Jobic Stéphane,Caurant Daniel,Petricek Václav,Advocat Thierry
Abstract
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 Ba
x
Cs
y
M
z
Ti8–z
O16 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(00γ)00 as a superspace group, was observed for all the single crystals under study.
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science
Cited by
9 articles.
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