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In situ high-temperature EXAFS measurements on radioactive and air-sensitive molten salt materials

Anna L. Smith, Malte N. Verleg, John Vlieland, Dick de Haas, Jaen A. Ocadiz-Flores, Philippe Martin, Jörg Rothe, Kathy Dardenne, Mathieu Salanne, Aïmen E. Gheribi, Elisa Capelli, Lambert van Eijck and Rudy J. M. Konings

Article (2019)

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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.

Uncontrolled Keywords

Xafs; fluoride salts; molecular dynamics; molten salt reactor; neutron diffraction

Subjects: 2400 Nuclear engineering > 2402 Radioactive materials
3100 Physics > 3108 Experimental methods and instrumentation
Department: Department of Chemical Engineering
Research Center: CRCT - Centre for Research in Computational Thermochemistry
Funders: Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Grant number: 722.016.00
PolyPublie URL: https://publications.polymtl.ca/5140/
Journal Title: Journal of Synchrotron Radiation (vol. 26, no. Pt .1)
Publisher: Journal of Synchrotron Radiation
DOI: 10.1107/s160057751801648x
Official URL: https://doi.org/10.1107/s160057751801648x
Date Deposited: 05 Jul 2022 13:01
Last Modified: 09 Apr 2024 01:24
Cite in APA 7: Smith, A. L., Verleg, M. N., Vlieland, J., de Haas, D., Ocadiz-Flores, J. A., Martin, P., Rothe, J., Dardenne, K., Salanne, M., Gheribi, A. E., Capelli, E., van Eijck, L., & Konings, R. J. M. (2019). In situ high-temperature EXAFS measurements on radioactive and air-sensitive molten salt materials. Journal of Synchrotron Radiation, 26(Pt .1), 124-136. https://doi.org/10.1107/s160057751801648x

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