Journal of Radioanalytical and Nuclear Chemistry

, Volume 292, Issue 3, pp 989-994

First online:

X-ray absorption fine structure spectroscopic study of uranium nitrides

  • Frederic PoineauAffiliated withDepartment of Chemistry, University of Nevada Las Vegas Email author 
  • , Charles B. YeamansAffiliated withLawrence Livermore National Laboratory
  • , G. W. C. SilvaAffiliated withMaterials Science and Technology Division, Oak Ridge National Laboratory
  • , Gary S. CereficeAffiliated withHealth Physics Department, University of Nevada Las Vegas
  • , Alfred P. SattelbergerAffiliated withEnergy Engineering and Systems Analysis Directorate, Argonne National Laboratory
  • , Kenneth R. CzerwinskiAffiliated withDepartment of Chemistry, University of Nevada Las Vegas

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Uranium mononitride (UN), sesquinitride (U2N3) and dinitride (UN2) were characterized by extended X-Ray absorption fine structure spectroscopy. Analysis on UN indicate the presence of three uranium shells at distances of 3.46(3), 4.89(5) and 6.01(6) Å and a nitrogen shell at a distance of 2.46(2) Å. For U2N3, two absorbing uranium atoms at different crystallographic positions are present in the structure. One of the uranium atoms is surrounded by nitrogen atoms at 2.28(2) Å and by uranium atoms at 3.66(4) and 3.95(4) Å. The second type of uranium atom is surrounded by nitrogen atoms at 2.33(2) and 2.64(3) Å and by uranium atoms at 3.66(4), 3.95(4) and 5.31(5) Å. Results on UN2 indicate two uranium shells at 3.71(4) and 5.32(5) Å and two nitrogen shells at 2.28(2) and 4.34(4) Å. The lattice parameters of UN, U2N3 and UN2 unit cells were respectively determined to be 4.89(5), 10.62(10) and 5.32(5) Å. Those results are well in agreement with those obtained by X-Ray diffraction analysis.


EXAFS Uranium Nitrides Nuclear fuel