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Use of nanoprobes to identify iron-silicates in a glass/iron/argillite system in deep geological disposal

Abstract : The understanding of glass alteration mechanisms in contact with iron is a major issue to study the long-term behavior of radioactive waste package in repository conditions. A glass/iron/claystone system was altered in contact with COx water at 50°C for 4.5 years in Andra's underground research laboratory in Bure, France. Multiscale and multitechnical (SEM-EDX, µRaman, STXM and TEM) characterization of the system revealed the presence of nanometric crystalline Fe(III)-rich smectite, assimilated to nontronite, in the glass alteration layer and in corrosion products. These phyllosilicates were identified by STXM using a comparative approach with a database of reference spectra obtained on iron-silicate.
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Charly Carrière, Philippe Dillmann, Eddy Foy, Delphine Neff, J.J. Dynes, et al.. Use of nanoprobes to identify iron-silicates in a glass/iron/argillite system in deep geological disposal. Corrosion Science, Elsevier, 2019, 158, pp.108104. ⟨10.1016/j.corsci.2019.108104⟩. ⟨cea-02397446⟩

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