X-ray absorption fine structure spectroscopic study of uranium nitrides

Uranium mononitride (UN), sesquinitride (U 2 N 3 ) and dinitride (UN 2 ) 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...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2012-06, Vol.292 (3), p.989-994
Main Authors: Poineau, Frederic, Yeamans, Charles B., Silva, G. W. C., Cerefice, Gary S., Sattelberger, Alfred P., Czerwinski, Kenneth R.
Format: Article
Language:English
Subjects:
ABSORPTION
Analysis
ATOMS
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
FINE STRUCTURE
Hadrons
Heavy Ions
Inorganic Chemistry
Nitrides
NITROGEN
Nuclear Chemistry
Nuclear Physics
Physical Chemistry
RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
SPECTROSCOPY
URANIUM
URANIUM NITRIDES
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Summary:Uranium mononitride (UN), sesquinitride (U 2 N 3 ) and dinitride (UN 2 ) 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 U 2 N 3 , 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 UN 2 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, U 2 N 3 and UN 2 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.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-011-1551-7