Role of ion species in radiation effects of Lu2Ti2O7 pyrochlore
Role of ion species in radiation effects of Lu2Ti2O7 pyrochlore
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离子种类在 Lu2Ti2O7 烧绿石辐射效应中的作用
DOI：
10.1016/j.jallcom.2016.09.227
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发表时间：
2017
影响因子：
6.2
通讯作者：
Yongqiang Wang
中科院分区：
文献类型：
--
作者：
Dongyan Yang;Yue Xia;Juan Wen;Jinjie Liang;Pengcheng Mu;Zhiguang Wang;Yuhong Li;Yongqiang Wang
为了研究离子种类在焦绿石辐射效应中的作用，用三种不同的离子束：400keV Ne~(2+)、2.7 MeV Ar11+和6.5 MeV Xe~(26+)对标准固相法制备的多晶Lu2Ti2O7样品进行了辐照。利用掠入射X射线衍射法对Lu2Ti2O7中的损伤层进行了表征。这三种辐照都在Lu2Ti2O7中引起了显著的非晶化过程和晶格膨胀。然而，当离子注量转换为标准剂量时，Lu2Ti2O7的辐射效应与注入的离子种类有很大的依赖关系。非晶化阈值剂量随离子质量和能量的增加而减小。此外，随着离子质量和能量的增加，非晶化速率和晶格膨胀率也随之增大。也就是说，在重离子辐照下，Lu2Ti2O7焦绿石更容易发生非晶化和晶格膨胀。然后在基于蒙特卡罗模拟的缺陷构型和碰撞级联密度的框架下对这些结果进行了讨论。
In an attempt to investigate the role of ion species in the radiation effects of pyrochlores, polycrystalline Lu2Ti2O7samples, prepared through a standard solid state process, were irradiated with three different ion beams: 400 keV Ne2+, 2.7 MeV Ar11+and 6.5 MeV Xe26+. To characterize the damaged layers in Lu2Ti2O7, the grazing incident X-ray diffraction technique was applied. All the three irradiations induce significant amorphization processes and lattice swelling in Lu2Ti2O7. However, when the ion fluence is converted to a standard dose in dpa, the radiation effects of Lu2Ti2O7show a great dependence on the implanted ion species. The threshold amorphization dose decreases with increasing ion mass and energy. Besides, the amorphization rate, as well as lattice swelling rate, increases with increasing ion mass and energy. That is, the Lu2Ti2O7pyrochlore is more susceptible to amorphization and lattice swelling under heavier ion irradiation. These results are then discussed in the framework of defect configuration and the density of collision cascades based on Monte Carlo simulations.