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Soudani, S., Paris, M. & Morizet, Y. (2024) The effect of iodine on the local environment of network-forming elements in aluminoborosilicate glasses: An NMR study. Journal of the American Ceramic Society, n/a. 
Added by: Richard Baschera (2024-04-16 08:11:20)   Last edited by: Richard Baschera (2024-04-16 08:13:52)
Type de référence: Article
DOI: 10.1111/jace.19764
Numéro d'identification (ISBN etc.): 1551-2916
Clé BibTeX: Soudani2024
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Catégories: IMN
Mots-clés: borosilicate glass, nuclear magnetic resonance, nuclear waste
Créateurs: Morizet, Paris, Soudani
Collection: Journal of the American Ceramic Society
Consultations : 1/3
Indice de consultation : 1%
Indice de popularité : 0.25%
Liens URLs     https://onlinelibr ... 10.1111/jace.19764
Résumé     
Knowledge of the structural organization of nuclear waste glasses at the atomic scale is the basis for further studies of macroscopic properties (e.g., fracture toughness, chemical durability, and leaching rate). Recent studies have focused on the iodine dissolution mechanism in oxide-based glasses synthesized under high-pressure conditions, but there is still a lack of key information on the extent of the modifications caused by iodine entering the glass network. We therefore decided to conduct an in-depth study by nuclear magnetic resonance on two series of aluminoborosilicate glasses synthetized under high pressure conditions and doped with either I2 or I2O5. The obtained 11B, 23Na, and 27Al nuclear magnetic resonance (NMR) spectra were fitted and correlated with the iodine content in order to find possible relationships with the local environment change for the probed cations. These data showed that iodine has no effect on the coordination of aluminum and very little effects on that of boron. In contrast, we found an expected relationship of the I content with the 23Na NMR parameters. In comparison with previous studies on the non-bridging oxygen (NBO) distribution in aluminoborosilicate, we suggest that Na+ is mainly scavenged from silica tetrahedra with one ortwo NBO (Q3${Q}<^>3$ or Q2${Q}<^>2$) as no boron planar triangles with one NBO are expected for such compositions. From those information, we establish a model for iodine dissolution in nuclear waste glass that is consistent with previous studies.
  
Notes     
_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/jace.19764
  
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