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Probing Covalency in the UO3 Polymorphs by U M4 edge HR- XANES

Podkovyrina, Y.; Pidchenko, I.; Prüßmann, T.; Bahl, S.; Göttlicher, J.; Soldatov, A.; Vitova, T.



Abstract (englisch): Local atomic and electronic structure investigations of uranium trioxide (UO3) crystalline phases performed by the U M4 edge HR-XANES technique is presented. The experimental U M4 edge HR-XANES spectra of α-UO3, β-UO3 and γ-UO3 polymorphic phases are compared with spectra of uranate (CaU2O7) and uranyl (UO3•1-2(H2O)) compounds. We describe a finger print approach valuable for characterization of variations of U-O axial bond lengths. Theoretical calculations of spectra using full-multiple-scattering theory (FEFF9.6 code) are performed. We have tested and selected input parameters, which provide best agreement between experimental and calculated spectra.


Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
ANKA - die Synchrotronstrahlungsquelle am KIT (ANKA)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1088/1742-6596/712/1/012092
ISSN: 1742-6588
URN: urn:nbn:de:swb:90-596003
KITopen ID: 1000059600
HGF-Programm 32.01.04; LK 02
Erschienen in Journal of physics / Conference Series
Band 712
Heft 1
Seiten 012092
Bemerkung zur Veröffentlichung 16th International Conference on X-ray Absorption Fine Structure (XAFS16), Karlsruhe, August 23-28, 2015
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