Evidence of a phase transition from UO2-x to UO2+x

IF 3.2 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Nuclear Materials Pub Date : 2025-09-15 DOI:10.1016/j.jnucmat.2025.156161

L. Desgranges , A. Canizares

引用次数: 0

Abstract

Uranium dioxide has been extensively studied for >70 years with regards to its importance as main nuclear fuel used worldwide. From a thermodynamic point of view, UO₂ 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 UO₂ that is now a border between UO_2-x and UO₂₊_x.

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从UO2-x到UO2+x相变的证据

二氧化铀作为世界范围内使用的主要核燃料，其重要性已被广泛研究了70年。从热力学的角度来看，迄今为止UO2被认为是单相的，其中点缺陷可以解释它从低化学计量到高化学计量时氧势的急剧变化。在这里，我们用拉曼光谱证明，从低化学计量到高化学计量的变化应该被认为是一个相变。这导致我们改变了关于UO2的范式，现在是UO2-x和UO2+x之间的边界。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Nuclear Materials 工程技术-材料科学：综合

CiteScore

5.70

自引率

25.80%

发文量

601

审稿时长

63 days

期刊介绍： The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome. The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example. Topics covered by JNM Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior. Materials aspects of the entire fuel cycle. Materials aspects of the actinides and their compounds. Performance of nuclear waste materials; materials aspects of the immobilization of wastes. Fusion reactor materials, including first walls, blankets, insulators and magnets. Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties. Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.