Print Email Facebook Twitter In situ high-temperature EXAFS measurements on radioactive and air-sensitive molten salt materials Title In situ high-temperature EXAFS measurements on radioactive and air-sensitive molten salt materials Author Smith, A.L. (TU Delft Delft University of Technology; TU Delft RST/Reactor Physics and Nuclear Materials) Verleg, M.N. (TU Delft EMSD AS-south Project engineers) Vlieland, J. (TU Delft RST/Technici Pool) de Haas, D.W. (TU Delft RST/Technici Pool) Ocadiz flores, J.A. Martin, Philippe (UMR 5257 CEA/CNRS/UM/ENSCM) Rothe, Jörg (Karlsruhe Institut für Technologie) Capelli, E. (TU Delft RST/Reactor Physics and Nuclear Materials) van Eijck, L. (TU Delft RST/Neutron and Positron Methods in Materials) Date 2018 Abstract The development at the Delft University of Technology (TU Delft, The Netherlands) of an experimental set-up dedicated to high-temperature in situ EXAFS measurements of radioactive, air-sensitive and corrosive fluoride salts is reported. A detailed description of the sample containment cell, of the furnace design, and of the measurement geometry allowing simultaneous transmission and fluorescence measurements is given herein. The performance of the equipment is tested with the room-temperature measurement of thorium tetrafluoride, and the Th—F and Th—Th bond distances obtained by fitting of the EXAFS data are compared with the ones extracted from a refinement of neutron diffraction data collected at the PEARL beamline at TU Delft. The adequacy of the sample confinement is checked with a mapping of the thorium concentration profile of molten salt material. Finally, a few selected salt mixtures (LiF:ThF4) = (0.9:0.1), (0.75:0.25), (0.5:0.5) and (NaF:ThF4) = (0.67:0.33), (0.5:0.5) are measured in the molten state. Qualitative trends along the series are discussed, and the experimental data for the (LiF:ThF4) = (0.5:0.5) composition are compared with the EXAFS spectrum generated from molecular dynamics simulations. Subject fluoride saltsmolecular dynamicsmolten salt reactorneutron diffractionXAFS To reference this document use: http://resolver.tudelft.nl/uuid:e2ace37c-38a9-4067-9363-9ec136397b28 DOI https://doi.org/10.1107/S160057751801648X ISSN 0909-0495 Source Journal of Synchrotron Radiation Part of collection Institutional Repository Document type journal article Rights © 2018 A.L. Smith, M.N. Verleg, J. Vlieland, D.W. de Haas, J.A. Ocadiz flores, Philippe Martin, Jörg Rothe, E. Capelli, L. van Eijck, More Authors Files PDF hf5371.pdf 2.64 MB Close viewer /islandora/object/uuid:e2ace37c-38a9-4067-9363-9ec136397b28/datastream/OBJ/view