Examination of the short-range structure of molten salts
ThF4, UF4, and related alkali actinide fluoride systems
J. A. Ocadiz flores (TU Delft - RST/Reactor Physics and Nuclear Materials)
Aimen E. Gheribi (Polytechnique Montreal)
J. Vlieland (TU Delft - RST/Technici Pool)
D.W. de Haas (TU Delft - RST/Technici Pool)
Kathy Dardenne (Karlsruhe Institut für Technologie)
Jörg Rothe (Karlsruhe Institut für Technologie)
R. J.M. Konings (European Commission Joint Research Centre, TU Delft - RST/Reactor Physics and Nuclear Materials)
A. L. Smith (TU Delft - RST/Reactor Physics and Nuclear Materials)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
The short-range structures of LiF-ThF4, NaF-AnF4, KF-AnF4, and Cs-AnF4 (An = Th, U), were probed using in situ high temperature Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy. Signally, the EXAFS spectra of pure molten ThF4 and UF4 were measured for the first time. The data were interpreted with the aid of Molecular Dynamics (MD) and standard fitting of the EXAFS equation. As in related studies, a speciation distribution dominated by [AnFx]4-x (x = 7, 8, 9) coordination complexes was observed. The average coordination number was found to decrease with the increasing size of the alkali cation, and increase with AnF4 content. An average coordination number close to 6, which had not been detected before in melts of alkali actinide fluorides, was seen when CsF was used as solvent. This journal is
help_outline