The fate of Si and Fe while nuclear glass alters with steel and clay

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CARRIERE, C, DILLMANN, P, GIN, S, NEFF, D, GENTAZ, L, BRUGUIER, F, MONNET, I, GARDES, E, SAHEB, M, FOY, E, NUNS, N, DELANOE, Alexis, DYNES, JJ, MICHAU, N and MARTIN, C (2021). The fate of Si and Fe while nuclear glass alters with steel and clay. npj Materials Degradation, 5 (1): 16. [Article]

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Abstract
The French concept developed to dispose high-level radioactive waste in geological repository relies on glassy waste forms, isolated from the claystone host rock by steel containers. Understanding interactions between glass and surrounding materials is key for assessing the performance of a such system. Here, isotopically tagged SON68 glass, steel and claystone were studied through an integrated mockup conducted at 50 °C for 2.5 years. Post-mortem analyses were performed from nanometric to millimetric scales using TEM, STXM, ToF-SIMS and SEM techniques. The glass alteration layer consisted of a crystallized Fe-rich smectite mineral, close to nontronite, supporting a dissolution/reprecipitation controlling mechanism for glass alteration. The mean glass dissolution rate ranged between 1.6 × 10−2 g m−2 d−1 to 3.0 × 10−2 g m−2 d−1, a value only 3–5 times lower than the initial dissolution rate. Thermodynamic calculations highlighted a competition between nontronite and protective gel, explaining why in the present conditions the formation of a protective layer is prevented.
More Information
Official URL:
https://doi.org/10.1038/s41529-021-00160-x
Open Access URL:
https://www.nature.com/articles/s41529-021-00160-x...
Open Access Version:
Published version
Uncontrolled Keywords:
4016 Materials engineering

Identifiers

Identification Number:
10.1038/s41529-021-00160-x
ORCID for C Carriere: ORCID iD orcid.org/0000-0002-1796-7539
ORCID for P Dillmann: ORCID iD orcid.org/0000-0003-3226-1611
ORCID for S Gin: ORCID iD orcid.org/0000-0002-1950-9195
ORCID for I Monnet: ORCID iD orcid.org/0000-0002-3821-6670
ORCID for E Gardes: ORCID iD orcid.org/0000-0002-8412-5059
ORCID for E Foy: ORCID iD orcid.org/0000-0002-1381-2767
ORCID for N Nuns: ORCID iD orcid.org/0000-0001-5930-0911
ORCID for Alexis Delanoe: ORCID iD orcid.org/0000-0002-1799-9338
ORCID for JJ Dynes: ORCID iD orcid.org/0000-0002-5727-530X
ORCID for N Michau: ORCID iD orcid.org/0000-0001-8387-4093

Library

Publisher:
Springer Science and Business Media LLC
Item Type:
Article
SWORD Depositor:
Symplectic Elements
Depositing User:
Symplectic Elements
Date record made live:
15 Jul 2026 10:05
Last Modified:
15 Jul 2026 10:15
Date of first compliant deposit:
29 May 2026
Date of first compliant Open Access:
15 July 2026
Version of first compliant deposit:
Version of Record
ISSN:
2397-2106
Volume:
5
URI:
https://shura.shu.ac.uk/id/eprint/37499
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