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Caractérisation et comportement sous irradiation de phases powellites dopées terres rares – Application au comportement à long terme des matrices de confinement des déchets nucléaires.

Abstract : This work deals with the behaviour under irradiation of a glass-ceramic made after heat treatment of a molybdenum rich R7/T7 type glass. Rare earth elements (Eu3+ and Nd3+) are used as surrogates of minor actinides and fission products as well as structural luminescent probes. We will focus on the behaviour of the crystalline phase which is a powellite type calcium molybdate that incorporated other elements including rare earth elements. In order to determine the crystalline-chemical properties of the powellite structure, Raman spectroscopy and photoluminescence analyses are led on natural powellite samples and synthetic ceramics with compositions from pure CaMoO4 to Ca0.76Sr0.1Na0.07Eu0.01La0.02Nd0.02Pr0.02MoO4, a model composition of the crystalline phase of the glass-ceramic. The analyses of synthetic samples irradiated with He, Ar and Pb ions compared to the behaviour of a natural powellite sample that contains uranium indicate that powellite resist strongly to irradiation and never reach the amorphous state.
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https://tel.archives-ouvertes.fr/tel-00546178
Contributor : Clément Mendoza <>
Submitted on : Monday, December 13, 2010 - 8:36:30 PM
Last modification on : Thursday, November 21, 2019 - 2:21:37 AM
Long-term archiving on: : Monday, March 14, 2011 - 3:22:50 AM

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Clément Mendoza. Caractérisation et comportement sous irradiation de phases powellites dopées terres rares – Application au comportement à long terme des matrices de confinement des déchets nucléaires.. Physique [physics]. Université Claude Bernard - Lyon I, 2010. Français. ⟨tel-00546178⟩

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