X-ray absorption fine structure spectroscopic study of uranium nitrides |
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| Authors: | Frederic Poineau Charles B Yeamans G W C Silva Gary S Cerefice Alfred P Sattelberger Kenneth R Czerwinski |
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| Institution: | (1) Department of Chemistry, University of Nevada Las Vegas, Las Vegas, NV 89154, USA;(2) Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;(3) Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 3783, USA;(4) Health Physics Department, University of Nevada Las Vegas, Las Vegas, NV 89154, USA;(5) Energy Engineering and Systems Analysis Directorate, Argonne National Laboratory, Lemont, IL 60439, USA |
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| Abstract: | 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. |
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