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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 ANKA - die Synchrotronstrahlungsquelle am KIT (ANKA)
Institut für Nukleare Entsorgung (INE)
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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