Chemical durability evaluation of silver ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
Chemical durability evaluation of silver phosphate–based glasses designed for the conditioning of radioactive iodine
Auteur(s) :
Chabauty, Anne-Lise [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Université de Montpellier [UM]
Mear, François [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Montagne, Lionel [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Campayo, L. [Auteur]
Université de Montpellier [UM]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Université de Montpellier [UM]
Mear, François [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Montagne, Lionel [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Campayo, L. [Auteur]
Université de Montpellier [UM]
Titre de la revue :
Journal of Nuclear Materials
Nom court de la revue :
Journal of Nuclear Materials
Numéro :
550
Pagination :
152919
Éditeur :
Elsevier
Date de publication :
2021-07
ISSN :
0022-3115
Mot(s)-clé(s) en anglais :
Silver phosphate glasses
Radioactive iodine
Nuclear waste conditioning
Chemical durability
Radioactive iodine
Nuclear waste conditioning
Chemical durability
Discipline(s) HAL :
Chimie/Chimie inorganique
Chimie/Matériaux
Chimie/Matériaux
Résumé en anglais : [en]
Silver phosphate glasses have been investigated for the conditioning of radioactive iodine 129. Their disposal in a deep geological repository requires high chemical durability, and to improve this property, two crosslinking ...
Lire la suite >Silver phosphate glasses have been investigated for the conditioning of radioactive iodine 129. Their disposal in a deep geological repository requires high chemical durability, and to improve this property, two crosslinking agents were examined here: Nb2O5 and Bi2O3. In addition, for some of these glasses, 50 % of phosphorus was replaced by molybdenum to assess the role of glass former entities. The effect of these modifications on the glass chemical durability was studied in pure water, at 50°C. Given the very long half-life of iodine 129 (15.7 × 106 years), only long-term alteration tests were carried out, in order to check if a passivating alteration layer could be formed in these conditions. Alteration rates were then calculated following various methods and compared. Results showed that the use of elemental releases in solution alone leads to an underestimation of the alteration rate, as there is no tracer element in the glass composition. For phospho-molybdate glasses, the addition of Nb2O5 had a significant effect on their chemical durability, i.e. their ability to form a passivating layer that retains most of the elements that are part of the pristine glass. For phosphorus, the more mobile element, release rates decreased by two orders of magnitude compared to phosphate-only glasses, and this trend depends on the Nb2O5 concentration.Lire moins >
Lire la suite >Silver phosphate glasses have been investigated for the conditioning of radioactive iodine 129. Their disposal in a deep geological repository requires high chemical durability, and to improve this property, two crosslinking agents were examined here: Nb2O5 and Bi2O3. In addition, for some of these glasses, 50 % of phosphorus was replaced by molybdenum to assess the role of glass former entities. The effect of these modifications on the glass chemical durability was studied in pure water, at 50°C. Given the very long half-life of iodine 129 (15.7 × 106 years), only long-term alteration tests were carried out, in order to check if a passivating alteration layer could be formed in these conditions. Alteration rates were then calculated following various methods and compared. Results showed that the use of elemental releases in solution alone leads to an underestimation of the alteration rate, as there is no tracer element in the glass composition. For phospho-molybdate glasses, the addition of Nb2O5 had a significant effect on their chemical durability, i.e. their ability to form a passivating layer that retains most of the elements that are part of the pristine glass. For phosphorus, the more mobile element, release rates decreased by two orders of magnitude compared to phosphate-only glasses, and this trend depends on the Nb2O5 concentration.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille
Centrale Lille
ENSCL
Univ. Artois
Université de Lille
Collections :
Équipe(s) de recherche :
RMN et matériaux inorganiques (RM2I)
Date de dépôt :
2022-03-24T09:02:58Z
2023-05-05T09:03:34Z
2023-05-05T09:03:34Z
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