Etude expérimentale du système fer-smectite en présence de solution à 80°C et 300°C

Abstract : In order to predict the possible chemical and mineralogical evolutions of a bentonite used as backfill material in the design of nuclear waste disposal, experiments were carried out using the MX80 bentonite placed in the presence of a solution and iron, at 80 and 300?C for 1 day to 9 months. Run products were characterised by X-ray diffraction, scanning electron microscopy, transmission electron microscopy (HR imaging, EDS and EELS) MÉossbauer spectroscopy, ICP AES and ICP MS analyses of solutions. the EQ3/6 geochemical code was used to simulate the evolutions of the system in the given conditions. A new method for the punctual determination of the valence of iron in clay minerals was developed, using electron energy loss spectroscopy (EELS) on TEM.
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Damien Guillaume. Etude expérimentale du système fer-smectite en présence de solution à 80°C et 300°C. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2002. Français. ⟨NNT : 2002NAN10033⟩. ⟨tel-01748183⟩

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