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X-ray spectroscopic study of chemical state in uranium carbides

Butorin, Sergei M. ; Bauters, Stephen; Amidani, Lucia; Beck, Aaron 1; Weiss, Stephan; Vitova, Tonya ORCID iD icon 1; Tougait, Olivier
1 Institut für Nukleare Entsorgung (INE), Karlsruher Institut für Technologie (KIT)

Abstract:

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.


Verlagsausgabe §
DOI: 10.5445/IR/1000144320
Veröffentlicht am 30.03.2022
Originalveröffentlichung
DOI: 10.1107/S160057752101314X
Scopus
Zitationen: 3
Web of Science
Zitationen: 4
Dimensions
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.03.2022
Sprache Englisch
Identifikator ISSN: 0909-0495, 1600-5775
KITopen-ID: 1000144320
HGF-Programm 32.11.03 (POF IV, LK 01) Fundamental Scientific Aspects
Erschienen in Journal of Synchrotron Radiation
Verlag International Union of Crystallography
Band 29
Heft 2
Seiten 295–302
Vorab online veröffentlicht am 27.01.2022
Nachgewiesen in Web of Science
Scopus
Dimensions
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