Citation: 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 Physico-Chimica Sinica, ;2017, 33(2): 364-369. doi: 10.3866/PKU.WHXB201611082 shu

EXELFS Analysis of Lattice Structure of Uranium Dioxide

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

Received Date: 5 September 2016
Revised Date: 8 November 2016

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

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.
- Actinide element,
- Uranium oxide,
- Electron energy-loss spectrometry,
- Extended energy loss fine structure,
- Radial structural function
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沈阳化工大学材料科学与工程学院沈阳 110142