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Theses

Réactivité fer métal/smectites en milieu hydraté à 80°C

Abstract : The storage of high activity nuclear wastes generally considers a metal container (iron), surrounded by an engineered argillaceous barrier (smectites). X-ray diffraction, infrared spectrometry and transmission electron microscopy used for chemical analysis and determination of the valence state of iron, make it possible to determine the evolution of the iron metal + smectite in presence of water at 80°C. The rate of detabilization of smectites varies from 0 to 100% depending on its characteristics: chemical composition, interlayer space occupancy, amount of octahedral iron. This smectite-iron metal reaction generates magnetite as well as a gel phase. Inside this gel, a new, very iron rich, 1 :1 phyllosilicate crystallises, with particles where the Fe(II)/Fe(III) ratio is 20/80 (close to odinite) or 50/50 (close to cronstedtite).
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Submitted on : Wednesday, February 25, 2004 - 11:49:18 AM
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  • HAL Id : tel-00005089, version 1

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Sébastien Lantenois. Réactivité fer métal/smectites en milieu hydraté à 80°C. Minéralogie. Université d'Orléans, 2003. Français. ⟨tel-00005089⟩

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