Academic Journal
Insights on the UO2+x/U4O9 phase characterization in oxidized UO2 pellets as a function of the hyper-stoichiometry
| العنوان: | Insights on the UO2+x/U4O9 phase characterization in oxidized UO2 pellets as a function of the hyper-stoichiometry |
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| المؤلفون: | Gaillard, C., Lotz, H., Sarrasin, L., Pipon, Y., Ducher, Roland, Moncoffre, N. |
| المساهمون: | Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'étude de transfert des radioéléments (IRSN/PSN-RES/SAM/LETR), Service des Accidents Majeurs (IRSN/PSN-RES/SAM), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Institut de Radioprotection et de Sûreté Nucléaire - IRSN, ANR-21-CE05-0035,BENEFICIA,Comportement d'un nouveau combustible en cas d'incident ou accident(2021) |
| المصدر: | EISSN: 2813-3412 ; Frontiers in Nuclear Engineering ; https://hal.science/hal-04780928 ; Frontiers in Nuclear Engineering, 2024, 3, pp.1465080. ⟨10.3389/fnuen.2024.1465080⟩ |
| بيانات النشر: | CCSD Frontiers Media |
| سنة النشر: | 2024 |
| المجموعة: | HAL-IN2P3 (Institut national de physique nucléaire et de physique des particules) |
| مصطلحات موضوعية: | UO2, oxidation, U4O9, Raman spectroscopy, HERFD-XANES, [CHIM]Chemical Sciences |
| الوصف: | International audience ; We present new insights on the study of the UO2+x/U4O9 equilibrium in UO2 as a function of the hyperstoichiometry x, by coupling HERFD-XANES at the uranium M4-edge and micro-Raman spectroscopy mapping. XANES allowed to measure the uranium speciation in the samples while Raman spectroscopy was used to characterize individually the composition and localization of the different oxide phases. UO2 pellets were oxidized under dry conditions at temperatures above the UO2+x/U4O9 phase transition to reach hyper-stoichiometries in the range 0.01 x 0.1. Combining both technics, we could determine the proportion between U4O9 and UO2+x. We show that at low O/U ratio, U4O9 is present as small clusters inside UO2 grains. As the O/U increases, we evidence the formation of a network of U4O9 crystallized inside UO2+x grains. The variation of the UO2+x phase hyperstoichiometry (x) was evaluated as a function of the sample oxidation. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | INSPIRE: 2847969 |
| DOI: | 10.3389/fnuen.2024.1465080 |
| الاتاحة: | https://hal.science/hal-04780928 https://hal.science/hal-04780928v2/document https://hal.science/hal-04780928v2/file/fnuen-03-1465080.pdf https://doi.org/10.3389/fnuen.2024.1465080 |
| Rights: | http://creativecommons.org/licenses/by/ ; info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.1465A15E |
| قاعدة البيانات: | BASE |
| DOI: | 10.3389/fnuen.2024.1465080 |
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