Defect study in Xe-irradiated UO2 by XRD, TEM and PAS

IF 2.8 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Nuclear Materials Pub Date : 2025-03-07 DOI:10.1016/j.jnucmat.2025.155740

C. Onofri , M. Gérardin , G. Carlot , V. Klosek , C. Bachelet , M.F. Barthe , P. Desgardin , R. Belin , D. Drouan , N. Tarisien , M. Cabié , M. Angleraud , T. Grenèche , H. Palancher

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引用次数: 0

Abstract

Transmission electron microscopy (TEM), X-ray diffraction (XRD) and positron annihilation spectroscopy (PAS) characterizations were combined on polycrystalline UO₂ disks, implanted with low energy xenon ions, to probe the microstructural transformations due to irradiation by taking advantage of their different sensitivities to radiation damage.

While XRD provides information on elastic strain (and thus free swelling) and microstrains, PAS is sensitive to vacancy defects and TEM allows the direct observation of extended defects (dislocations and vacancy objects).

These data were gathered in order to understand mechanisms involved in the damage build up in UO₂. At a very low damage level, an increase of the free swelling is highlighted along with first vacancy defects, and then with interstitials dislocation loops. At a higher damage level, dislocation lines appear through loop interactions, inducing a small free swelling relaxation associated with an increase of microstrains. The results of this extensive experimental study are then discussed in the light of literature data.

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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.