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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2017,Vol.33>> Issue(2)>> 364-369     doi: 10.3866/PKU.WHXB201611082         中文摘要
EXELFS Analysis of Lattice Structure of Uranium Dioxide
JIANG Ao-Ke1, ZHAO Ya-Wen2, LONG Zhong2, ZHANG Lei2, HU Yin1, ZENG Rong-Guang2, ZHANG Yan-Zhi1, XIAO Hong2, ZHU Kang-Wei1, LIU Ke-Zhao2
1 Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621900, Sichuan Province, P. R. China;
2 China Academy of Engineering Physics, Mianyang 621900, Sichuan Province, P. R. China
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The present work demonstrates that extended energy loss fine structure (EXELFS) analysis can be used to investigate the microstructure of Uranium dioxide. First, EXELFS was extracted by IFEFFIT package from oxygen-K edge in electron energy-loss spectrometry (EELS) spectrum of UO2. Next, the EXELFS was Fourier transformed to obtain the experimental real-space spectrum, which was then back-Fourier transformed to obtain the experimental reciprocal-space spectrum. In the next step, the two experimental spectra were fitted with the IFEFFIT package to obtain information about the local structure of the oxygen atoms. Finally, the lattice constant of UO2 determined by EXELFS analysis was found to be merely 1.4% lower than that experimentally obtained by X-ray diffraction (XRD). This result confirms that EXELFS analysis is a feasible method of investigating UO2 microstructural information.



Keywords: Actinide element   Uranium oxide   Electron energy-loss spectrometry   Extended energy loss fine structure   Radial structural function  
Received: 2016-09-05 Accepted: 2016-11-08 Publication Date (Web): 2016-11-08
Corresponding Authors: LIU Ke-Zhao, ZHU Kang-Wei Email: liukz@hotmail.com;zhukw07@qq.com

Fund: The project was supported by the National Natural Science Foundation of China (11404295, 11404296, 11305148).

Cite this article: JIANG Ao-Ke, ZHAO Ya-Wen, LONG Zhong, ZHANG Lei, HU Yin, ZENG Rong-Guang, ZHANG Yan-Zhi, XIAO Hong, ZHU Kang-Wei, LIU Ke-Zhao. EXELFS Analysis of Lattice Structure of Uranium Dioxide[J]. Acta Phys. -Chim. Sin., 2017,33 (2): 364-369.    doi: 10.3866/PKU.WHXB201611082

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