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Effets d'irradiations sur la structure de verres borosilicatés - Comportement à long terme des matrices vitreuses de stockage des déchets nucléaires

Abstract : This work deals with the long term behaviour of R7T7-type nuclear waste glasses and more particularly of non-active borosilicated glasses made up of 3 or 5 oxides. Radioactivity of active glasses is simulated by multienergies ions implantations which reproduce the same defects. The damages due to the alpha particles are simulated by helium ions implantations and those corresponding to the recoil nucleus are obtained with gold ions ones. Minor actinides, stemming from the used fuel, is simulated by trivalent rare-earths (Eu3+ and Nd3+)
In a first part, we have shown by macroscopic experiments (Vickers hardness - swelling) and optical spectroscopies (Raman - ATR-IR) that the structure of the glassy matrixes is modified under implantations until a dose of 2,3.1013 at.cm-2, which corresponds to a R7T7 storage time estimated at 300 years. Beyond this dose, no additional modifications have been observed.
The second part concerns the local environment of the rare-earth ions in glasses. Two different environments were found and identified as follows: one is a silicate rich one and the other is attributed to a borate rich one.
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https://tel.archives-ouvertes.fr/tel-00177241
Contributor : Julien de Bonfils <>
Submitted on : Friday, October 5, 2007 - 6:58:31 PM
Last modification on : Wednesday, November 20, 2019 - 2:41:50 AM
Long-term archiving on: : Sunday, April 11, 2010 - 10:17:39 PM

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  • HAL Id : tel-00177241, version 1

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Julien de Bonfils. Effets d'irradiations sur la structure de verres borosilicatés - Comportement à long terme des matrices vitreuses de stockage des déchets nucléaires. Physique Atomique [physics.atom-ph]. Université Claude Bernard - Lyon I, 2007. Français. ⟨tel-00177241⟩

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