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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Radiation damage in uranium dioxide: Coupled effect between electronic and nuclear energy losses
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Radiation damage in uranium dioxide: Coupled effect between electronic and nuclear energy losses

机译：二氧化铀的辐射损伤：电子和核能损失之间的耦合效应

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摘要

A coupling between the nuclear and electronic energy losses occur in the nuclear fuel (UO2) during in-reactor operations. However, the underlying mechanisms involved are still to be investigated. In this work, synergistic effects of nuclear and electronic energy losses have been investigated by irradiating crystals with single (900 keV I ions or 27 MeV Fe ions) and dual (900 keV I ions and 27 MeV Fe ions, simultaneously) ion beams at the JANNUS-Saclay facility. The damage build-up kinetic was in situ characterized by Raman spectroscopy. The microstructure evolution was determined by transmission electron microscopy (TEM) observations and by X-ray diffraction (XRD) analysis. Results show that both crystalline disorder and strain level are lower under dual-beam compared to the single-beam ion irradiations. Indeed, the dual-beam irradiation induces a transition from the formation of dislocation loops to dislocation lines. This result can be explained, in the framework of the thermal spike model, by a local increase of the temperature along the high-energy ion path. This temperature increase likely induces an enhanced defect migration leading to defect rearrangement. (C) 2020 Elsevier B.V. All rights reserved.
机译：在反应堆操作期间核燃料（UO2）之间发生核燃料和电子能量损失之间的耦合。但是，所涉及的潜在机制仍在调查。在这项工作中，通过用单一（900kev I离子或27meV Fein离子）和双（900keV I离子和27mev Fein离子，同时）离子梁照射晶体和电子能量损失的协同效应Jannus-Saclay设施。损伤堆积动力学原位以拉曼光谱为特征。通过透射电子显微镜（TEM）观察和通过X射线衍射（XRD）分析来测定微观结构演化。结果表明，与单光束离子照射相比，双束下晶体病症和应变水平都较低。实际上，双光束辐射引起从脱位环的形成转变为位错线。在热峰值模型的框架中，可以通过沿着高能离子路径的局部增加来解释该结果。该温度增加可能引起增强的缺陷迁移，导致缺陷重排。 （c）2020 Elsevier B.v.保留所有权利。

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