Study on effects of swift heavy ion irradiation in cerium dioxide using synchrotron radiation X-ray absorption spectroscopy
Study on effects of swift heavy ion irradiation in cerium dioxide using synchrotron radiation X-ray absorption spectroscopy
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DOI：
10.1016/j.nimb.2008.03.155
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发表时间：
2008-06-01
影响因子：
1.3
通讯作者：
Kinoshita, M.
中科院分区：
文献类型：
--
作者：
Ohno, H.;Iwase, A.;Kinoshita, M.
为了模拟高能裂变产物对高燃耗 UO2 核燃料芯块的影响，用 200 MeV Xe 离子辐照 CeO2 薄膜和块状样品。通过使用同步加速器辐射设施的扩展 X 射线吸收精细结构 (EXAFS) 测量和 X 射线光电子能谱 (XPS) 研究了辐射的影响。 Ce K 边缘附近的辐照薄膜的 EXAFS 光谱显示 Ce 离子周围形成了氧缺陷。 XPS 谱显示，Cc 原子的价态在辐照作用下从本征 Ce4+ 态转变为 Ce3+ 态。由于即使在低注量照射下也会出现这种照射效应，实验结果表明氧缺乏和Ce价态的变化是由于200 MeV Xe离子引起的高密度电子激发所致。 (c) 2008 Elsevier B.V. 保留所有权利。
In order to simulate the effects of high energy fission products on high-burnup UO2 nuclear fuel pellets, CeO2 thin films and bulk specimens were irradiated with 200 MeV Xe ions. Effects of the irradiation were studied by using Extended X-ray Absorption Fine Structure (EXAFS) measurement and X-ray photoelectron spectroscopy (XPS) at synchrotron radiation facilities. The EXAFS spectra for the irradiated thin films near the Ce K-edge show the formation of the oxygen deficiency around Ce ions. XPS Spectra show that the valence state of Cc atoms is changed from intrinsic Ce4+ to Ce3+ state by the irradiation. As such irradiation effects appear even for low fluence irradiation, the experimental result suggests that the oxygen deficiency and the change in Ce valence state are due to high-density electronic excitation induced by the 200 MeV Xe ions. (c) 2008 Elsevier B.V. All rights reserved.