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Morizet, Y., Trcera, N., Suzuki-Muresan, T., Soudani, S., Fonda, E. & Paris, M. (2022) Local environment of iodine dissolved as iodate in high-pressure aluminoborosilicate glasses: A I K-edge x-ray absorption spectroscopic study. J. Chem. Phys. 156 154508.
Added by: Richard Baschera (2022-06-09 13:37:51) Last edited by: Richard Baschera (2022-06-09 13:40:58) |
| Type de référence: Article DOI: 10.1063/5.0089039 Numéro d'identification (ISBN etc.): 0021-9606 Clé BibTeX: Morizet2022 Voir tous les détails bibliographiques  |
Catégories: IMN Créateurs: Fonda, Morizet, Paris, Soudani, Suzuki-Muresan, Trcera Collection: J. Chem. Phys. |
Consultations : 1/283
Indice de consultation : 8% Indice de popularité : 2% |
| Liens URLs https://aip.scitat ... /10.1063/5.0089039 |
| Résumé |
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The use of high-pressure synthesis conditions to produce I-bearing aluminoborosilicate represents a promising issue for the immobilization of I-129 radioisotope. Furthermore, iodine appears to be more solubilized in glasses under its iodate (I5+) form rather than its iodide (I-) form. Currently, the local atomic environment for iodine is poorly constrained for I- and virtually unknown for I5+ or I7+. We used I K-edge x-ray absorption spectroscopy conducted at 20 K for determining the local atomic environment of iodine dissolved as I-, I5+, and I7+ in a series of aluminoborosilicate glasses. We determined that I- is surrounded by either Na+ or Ca2+ in agreement with previous studies. The signal collected from EXAFS reveals that I5+ is surrounded invariably by three oxygen atoms forming an IO3- cluster charge compensated by Na+ and/or Ca2+. The I-O distance in iodate dissolved in glass is comparable to the I-O distance in crystalline compounds at similar to 1.8 angstrom. The distance to the second nearest neighbor (Na+ or Ca2+) is also constant at similar to 3.2 angstrom. This derived distance is identical to the distance between I- and Na+ or Ca2+ in the case of iodide local environment. For one sample containing iodate and periodate, the distinction between the local environment of I5+ and I7+ could not be made, suggesting that both environments have comparable EXAFS signals.
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Publisher: American Institute of Physics
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