Biblio. IMN

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Morizet, Y., Jolivet, V., Trcera, N., Suzuki-Muresan, T. & Hamon, J. (2021) Iodine local environment in high pressure borosilicate glasses: An X-ray photoelectron spectroscopy and X-ray absorption spectroscopy investigation. Journal of Nuclear Materials, 553 153050. 
Added by: Richard Baschera (2021-07-08 14:51:51)   Last edited by: Richard Baschera (2021-07-08 14:53:45)
Type de référence: Article
DOI: 10.1016/j.jnucmat.2021.153050
Numéro d'identification (ISBN etc.): 0022-3115
Clé BibTeX: Morizet2021
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Catégories: IMN
Créateurs: Hamon, Jolivet, Morizet, Suzuki-Muresan, Trcera
Collection: Journal of Nuclear Materials
Consultations : 4/244
Indice de consultation : 7%
Indice de popularité : 1.75%
The I-12(9) radioactive isotope is a by-product of nuclear plants activity. Owing to its strong volatility, there is currently no ideal protocol to immobilize I-129 in nuclear waste borosilicate glasses. Recently, we have proposed the use of high-pressure syntheses to dissolve iodine in various glass compositions; however, I speciation and dissolution mechanism could not be determined. We have adopted an approach combining X-ray Photoelectron Spectroscopy (XPS) and X-ray Absorption Spectroscopy (XAS) methods to determine I speciation and molecular environment in glasses containing from 0.5 to 2.5 mol.% I. The XPS spectra reveal that I is mostly dissolved as iodide ({>}85% I-) with a small proportion of elemental iodine ({<}15% I-0) and the absence of iodate species (I5+). For borosilicate glasses, the XAS results and subsequent spectrum simulations suggested that Na and Ca are involved in the I- vicinity with averaged derived coordination number (CN) of 3.6 and 2.0 and bond length to the nearest neighbour (r(X-I)) 2.98 and 2.85 angstrom, respectively. These results suggest that the coexistence of both I- and I5+ species is not requested for electric neutrality but instead, we explain the I speciation by the possible interplay with oxygen species from the borosilicate matrix. In addition, the results imply that the borosilicate network is affected by the I dissolution. (C) 2021 Elsevier B.V. All rights reserved.
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