Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 542, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2020.152404
Keywords
Uranium nitrides; XANES; EXAFS; Microstructure
Funding
- Discipline Development Foundation of Science and Technology on Surface Physics and Chemistry Laboratory [XKFZ201707]
- National Natural Science Foundation of China [21701183]
- Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences [XDA2100000]
- K. C. Wong Education Foundation [GJTD-2018-10]
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Knowledge of the local structure such as U-N interaction is a prerequisite for a better understanding of the physical and chemical properties of nitrogen-rich uranium nitrides. The local structure of U in polycrystalline alpha-U2N3+delta film was investigated by using X-ray absorption spectroscopy at the U L-3 edge combined with spectral calculation using FEFF 9.6 program based on the ab initio multiple scattering theory. The polycrystalline alpha-U2N3+delta sample was shown to be close to U2N3 with a narrow distribution of U-N bond lengths. The average valence of U was estimated to be 1.3 and the average bond distance of U-N was determined to be 2.30 A. The local structure of U in the alpha-U2N3+delta sample can be further specifically expressed by a U2N3 model with a lattice parameter of 10.69 (9) A where U1 atoms are surrounded by nitrogen atoms at similar to 2.277, similar to 2.295 and similar to 2.320 A. (C) 2020 Elsevier B.V. All rights reserved.
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