Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (2): 364-369.doi: 10.3866/PKU.WHXB201611082

• ARTICLE • Previous Articles     Next Articles

EXELFS Analysis of Lattice Structure of Uranium Dioxide

Ao-Ke JIANG1,Ya-Wen ZHAO2,Zhong LONG2,Lei ZHANG2,Yin HU1,Rong-Guang ZENG2,Yan-Zhi ZHANG1,Hong XIAO2,Kang-Wei ZHU1,*(),Ke-Zhao LIU2,*()   

  1. 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:2016-09-05 Published:2017-01-12
  • Contact: Kang-Wei ZHU,Ke-Zhao LIU E-mail:zhukw07@qq.com;liukz@hotmail.com
  • Supported by:
    the National Natural Science Foundation of China(11404295,11404296,11305148)

Abstract:

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.

Key words: Actinide element, Uranium oxide, Electron energy-loss spectrometry, Extended energy loss fine structure, Radial structural function

MSC2000: 

  • O641