Study of the stability of the structural properties of CeO2 microparticles to helium irradiation
Study of the stability of the structural properties of CeO2 microparticles to helium irradiation
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DOI：
10.1016/j.surfcoat.2019.125286
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发表时间：
2020-02
影响因子：
5.4
通讯作者：
M. Zdorovets;A. Kozlovskiy
中科院分区：
文献类型：
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作者：
M. Zdorovets;A. Kozlovskiy
研究了CeO_2微粒对能量为40 keV、注量为1015- 1016 ion/cm ~ 2的低能~（60）Fe ~（2+）离子辐照的抗辐照性能。该研究发现，与最初的球形微粒相比，辐照微粒是烧结的球形团聚体的混合物，具有多孔夹杂物。根据能量色散分析，在辐照通量的增加导致的氧含量的增加和其在结构上的不均匀分布，这导致违反的化学计量的研究中的微粒。有人发现，原子从晶格位置的位移作为照射的结果，以及它们随后的迁移，导致晶面间距的变化和晶格的扭曲和变形的外观。根据X射线衍射数据，所研究的微粒的晶体结构的变化与由于缺陷的迁移和氧缺陷的空位密度的增加以及晶体结构的部分溶胀引起的晶体结构的变形和扭曲有关。
The work is devoted to the study of the radiation resistance of CeO2microparticles to irradiation with low-energy Не2+ions with an energy of 40 keV, the irradiation fluence was 1015–1016ion/cm2. The study found that, in contrast to the initial spherical microparticles, irradiated microparticles are a mixture of sintered sphere-like agglomerates, with porous inclusions. According to energy dispersive analysis, an increase in the irradiation fluence leads to an increase in the oxygen content and its uneven distribution over the structure, which leads to a violation of the stoichiometry of the microparticles under study. It was found that the displacement of atoms from the lattice sites as a result of irradiation, as well as their subsequent migration, leads to a change in interplanar spacings and the appearance of distortions and deformations of the crystal lattice. According to X-ray diffraction data, changes in the crystal structure of the microparticles under study are associated with deformation and distortion of the crystal structure due to migration of defects and an increase in the vacancy density of oxygen defects, as well as partial swelling of the crystal structure.