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

Published online by Cambridge University Press:  26 February 2011

Clara Fillaux ,
Christophe Den Auwer ,
Dominique Guillaumont ,
Eric Simoni ,
Nicole Barré ,
David K. Shuh  and
Tolek Tyliszczak
Clara Fillaux
Affiliation:
clara.fillaux@cea.fr, CEA, CEA Marcoule, DEN/DRCP/SCPS, Bagnols sur Cèze, France, 30207, France
Christophe Den Auwer
Affiliation:
christophe.denauwer@cea.fr, CEA Marcoule, DEN/DRCP/SCPS, France
Dominique Guillaumont
Affiliation:
dominique.guillaumont@cea.fr, CEA Marcoule, DEN/DRCP/SCPS, France
Eric Simoni
Affiliation:
simoni@ipno.in2p3.fr, Institut de Physique Nucléaire d’Orsay, France
Nicole Barré
Affiliation:
barren@ipno.in2p3.fr, Institut de Physique Nucléaire d’Orsay, France
David K. Shuh
Affiliation:
DKShuh@lbl.gov, Lawrence Berkeley National Laboratory, United States
Tolek Tyliszczak
Affiliation:
tolek@lbl.gov, Lawrence Berkeley National Laboratory, United States
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Abstract

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.

Keywords

actinideabsorptionsimulation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 893: Symposium JJ – Actinides 2005 – Basic Science, Applications and Technology , 2005 , 0893-JJ03-07
Copyright
Copyright © Materials Research Society 2006

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References

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