Evidence of a phase transition from UO2-x to UO2+x
Year: 2025
Type: article
Abstract: ABSTRACT Uranium dioxide has been extensively studied for more than 70 years with regards to its importance as main nuclear fuel used worldwide. From a thermodynamic point of view, UO 2 was considered up to now as a single phase, in which point defects would explain its sharp change of oxygen potential when going from hypo to hyper-stoichiometry. Here, we demonstrate using Raman spectroscopy, that the change from hypo to hyper-stoichiometry should be considered as a phase transition. This leads us to a change of paradigm about UO 2 that is now a border between UO 2-x and UO 2+x .
Source: Journal of Nuclear Materials
Authors: L. Desgranges, A. Canizares
Institutions: Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Cadarache, Institut de Recherche sur les Systèmes Nucléaires pour la production d'Energie bas carbone, Université d'Orléans, Centre National de la Recherche Scientifique, Conditions Extrêmes et Matériaux Haute Température et Irradiation
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,640
OpenAlex ID: W4414246040