Title: Charge distribution and local structure of americium bearing thorium oxide solid solutions
Authors: CARVAJAL NUNEZ URSULAPRIEUR DAMIENVITOVA T.SOMERS Joseph
Citation: INORGANIC CHEMISTRY vol. 51 no. 21 p. 11762-11768
Publisher: AMER CHEMICAL SOC
Publication Year: 2012
JRC N°: JRC73273
ISSN: 0020-1669
URI: http://pubs.acs.org/doi/full/10.1021/ic301709d
http://publications.jrc.ec.europa.eu/repository/handle/JRC73273
DOI: 0.1021/ic301709d
Type: Articles in periodicals and books
Abstract: The electronical and structural properties of Th0.80Am0.20O2-x materials have been studied by the coupling X-Ray Diffraction (XRD) and X-ray Absorption Spectroscopy (XAS) techniques. A substoichiometric fluorite Th(+IV)0.80Am(+III)0.20O1.90 solid solution is found following sintering in moisturised Ar-H2. In contrast, heating of this sample in air leads to a non-defective fluorite Th(+IV)0.80Am(+IV)0.20O2.00 solid solution. The structure of these solid solutions compounds were fully characterised by assessing the interatomic distances, the coordination numbers and the structural disorder. The effect of sintering atmosphere on these crystallographical parameters and on the cation valences has been determined and the capability of ThO2 to accommodate tri- and quatravalent actinides in the fluorite structure assessed.
JRC Directorate:Nuclear Safety and Security

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