Studies of Structural and Electronic Properties of Uranium Compounds, by XANES Spectroscopy

Autor: Nicole Barre, Christophe Den Auwer, Dominique Guillaumont, David K. Shuh, Clara Fillaux, Tolek Tyliszczak, Eric Simoni
Rok vydání: 2005
Předmět:
Zdroj: MRS Proceedings. 893
ISSN: 1946-4274
0272-9172
DOI: 10.1557/proc-0893-jj03-07
Popis: X-ray absorption near edge structure (XANES) is a sensitive probe of the electronic structure, and can provide information about the valency, the unoccupied electronic states and the effective charge of the absorbing atom. In this paper, near edge x-ray absorption fine structure spectra are reported at the L3, M5 and N5 thresholds and used to determined structural and electronic properties of U(VI) within uranyl nitrate (UO2(NO3)2.6H2O) and perovskite (Ba2ZnUO6). Experimental data analysis by simulating the absorption edge allows to compare the coordination polyhedrons, identify the electronic transitions and calculate the density of states associated with the absorption spectra. Moreover, a coupling between simulations of the experimental spectra and quantum chemical calculations is performed, in order to improve the model describing the final states and better understand the bonding properties of the cation with the ligand.
Databáze: OpenAIRE
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