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Synthèse, caractérisation et étude du comportement sous irradiation électronique de matrices de type hollandite destinées au confinement du césium radioactif

Virginie Aubin
Abstract : Research on treating specifically the long-lived and high level nuclear wastes, notably cesium, is currently carried out in France. Cesium immobilization in host matrices of high chemical durability constitutes the favoured option. Hollandite matrix is a good candidate because of its high cesium incorporation ability and its excellent chemical stability. During this study, different compositions of hollandite ceramics BaxCsyCzTi8-zO16 (C=Al3+, Cr3+, Ga3+, Fe3+, Mg2+, Sc3+), synthesized by oxide route, were characterized in terms of structure, microstructure and physical and chemical properties. Iron ions seems to be the most suitable of the studied C cations to get high-performance hollandites. The stability of these ceramics under external electron irradiation, simulating the β particles emitted by radioactive cesium, were also estimated, at the macroscopic and atomic scale. The point defects creation and their thermal stability were followed by electron paramagnetic resonance.
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https://pastel.archives-ouvertes.fr/pastel-00001091
Contributor : Ecole Chimie Paristech <>
Submitted on : Wednesday, March 2, 2005 - 8:00:00 AM
Last modification on : Wednesday, March 2, 2005 - 8:00:00 AM

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Virginie Aubin. Synthèse, caractérisation et étude du comportement sous irradiation électronique de matrices de type hollandite destinées au confinement du césium radioactif. Chemical Sciences. Chimie ParisTech, 2004. English. ⟨pastel-00001091⟩

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