X-ray spectroscopic study of chemical state in uranium carbides

Autor: Sergei M. Butorin, Stephen Bauters, Lucia Amidani, Aaron Beck, Stephan Weiss, Tonya Vitova, Olivier Tougait
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Journal of Synchrotron Radiation, Vol 29, Iss 2, Pp 295-302 (2022)
Druh dokumentu: article
ISSN: 1600-5775
16005775
DOI: 10.1107/S160057752101314X
Popis: UC and UMeC2 (Me = Fe, Zr, Mo) carbides were studied by the high-energy-resolution fluorescence-detected X-ray absorption (HERFD-XAS) technique at the U M4 and L3 edges. Both U M4 and L3 HERFD-XAS reveal some differences between UMeC2 and UC; there are differences also between the M4 and L3 edge results for both types of carbide in terms of the spectral width and energy position. The observed differences are attributed to the consequences of the U 5f, 6d–4d(3d) hybridization in UMeC2. Calculations of the U M4 HERFD-XAS spectra were also performed using the Anderson impurity model (AIM). Based on the analysis of the data, the 5f occupancy in the ground state of UC was estimated to be 3.05 electrons. This finding is also supported by the analysis of U N4,5 XAS of UC and by the results of the AIM calculations of the U 4f X-ray photoelectron spectrum of UC.
Databáze: Directory of Open Access Journals
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