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Chlique, C., Lambertin, D., Frizon, F., Deniard, P. & Jobic, S. (2016) Effect of temperature on the gamma-MnO2/"Ag2O" hydrogen getter structure. Fusion Eng. Des. 112 475–479.
Added by: Richard Baschera (2016-12-14 14:48:52) Last edited by: Richard Baschera (2016-12-14 16:01:36) |
| Type de référence: Article DOI: 10.1016/j.fusengdes.2016.06.014 Numéro d'identification (ISBN etc.): 0920-3796 Clé BibTeX: Chlique2016 Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: Getter, hollandite, mno2, pair distribution function, temperature, xrd Créateurs: Chlique, Deniard, Frizon, Jobic, Lambertin Collection: Fusion Eng. Des. |
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| Résumé |
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Manganese oxides based materials, as gamma-MnO2/"Ag2O", are considered to control the hydrogen risk from radioactive waste packaging. The efficiency of hydrogen trapping at room temperature has been demonstrated. However, in accidental conditions, the increasing temperature can be detrimental for hydrogen performance in nuclear waste packages. As a function of temperature, structural evolution of gamma-MnO2/"Ag20" getter was determined by X-Ray Diffraction (XRD), Pair Distribution Function (PDF) and Thermogravimetric Analysis (TGA). Kinetics of the hydrogen trapping were related to the structure evolution of gamma-MnO2/"Ag20". Ramsdellite (R-MnO2) and pyrolusite (beta-MnO2) were the main phases existing below 400 degrees C, then Ag-hollandite (quadratic), Ag-hollandite (monoclinic), Mn2O3 and Mn3O4 were formed at 500 degrees C, 600 degrees C, 700 degrees C and 850 degrees C, respectively. Hydrogen trapping was efficient until 400 degrees C where the gamma-MnO2 structure remains. (C) 2016 Elsevier B.V. All rights reserved.
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