U.S. Department of Energy Office of Scientific and Technical Information
Optical spectroscopy of molten fluorides: Methods, electronic and vibrational data, structural interpretation, and relevance to radiative heat transfer
In this study, to help address the need for predicting radiative heat transfer (RHT) behavior of molten salts, we conducted a comprehensive review of methods and data from optical spectroscopic measurements on molten fluoride salts. Transmittance, reflectance, and trans-reflectance experimental methods are discussed, along with the corresponding data reduction methodology and the limitations of each technique. Optical spectroscopy is a convenient indirect probe for changes in structural parameters with temperature and composition. Electronic and vibrational absorption data for transition-metal, lanthanide, and actinide solutes and vibrational absorption data for alkali and alkaline earth fluoride solvents are compiled, and the corresponding structural interpretation is discussed and compared with other experimental and theoretical work. We find that solvent and solute vibrational absorption can be significant in the mid-infrared, resulting in near-infrared edges of significance to RHT. Extrapolation and averaging of existing edge data leads to estimated gray absorption coefficient values at 700 °C of 546 m—1 for FLiBe and 276 m—1 for FLiNaK, both within the range of 1 – 6000 m—1 identified to be of engineering relevance for radiative heat transfer analysis.
Derdeyn, William B., et al. "Optical spectroscopy of molten fluorides: Methods, electronic and vibrational data, structural interpretation, and relevance to radiative heat transfer." Journal of Molecular Liquids, vol. 385, May. 2023. https://doi.org/10.1016/j.molliq.2023.121936
Derdeyn, William B., Mastromarino, Sara, Gakhar, Ruchi, Anderson, Mark H., Kats, Mikhail A., & Scarlat, Raluca O. (2023). Optical spectroscopy of molten fluorides: Methods, electronic and vibrational data, structural interpretation, and relevance to radiative heat transfer. Journal of Molecular Liquids, 385. https://doi.org/10.1016/j.molliq.2023.121936
Derdeyn, William B., Mastromarino, Sara, Gakhar, Ruchi, et al., "Optical spectroscopy of molten fluorides: Methods, electronic and vibrational data, structural interpretation, and relevance to radiative heat transfer," Journal of Molecular Liquids 385 (2023), https://doi.org/10.1016/j.molliq.2023.121936
@article{osti_2310922,
author = {Derdeyn, William B. and Mastromarino, Sara and Gakhar, Ruchi and Anderson, Mark H. and Kats, Mikhail A. and Scarlat, Raluca O.},
title = {Optical spectroscopy of molten fluorides: Methods, electronic and vibrational data, structural interpretation, and relevance to radiative heat transfer},
annote = {In this study, to help address the need for predicting radiative heat transfer (RHT) behavior of molten salts, we conducted a comprehensive review of methods and data from optical spectroscopic measurements on molten fluoride salts. Transmittance, reflectance, and trans-reflectance experimental methods are discussed, along with the corresponding data reduction methodology and the limitations of each technique. Optical spectroscopy is a convenient indirect probe for changes in structural parameters with temperature and composition. Electronic and vibrational absorption data for transition-metal, lanthanide, and actinide solutes and vibrational absorption data for alkali and alkaline earth fluoride solvents are compiled, and the corresponding structural interpretation is discussed and compared with other experimental and theoretical work. We find that solvent and solute vibrational absorption can be significant in the mid-infrared, resulting in near-infrared edges of significance to RHT. Extrapolation and averaging of existing edge data leads to estimated gray absorption coefficient values at 700 °C of 546 m—1 for FLiBe and 276 m—1 for FLiNaK, both within the range of 1 – 6000 m—1 identified to be of engineering relevance for radiative heat transfer analysis.},
doi = {10.1016/j.molliq.2023.121936},
url = {https://www.osti.gov/biblio/2310922},
journal = {Journal of Molecular Liquids},
issn = {ISSN 0167-7322},
volume = {385},
place = {United States},
publisher = {Elsevier},
year = {2023},
month = {05}}
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)
Grant/Contract Number:
AC07-05ID14517; NE0008985
OSTI ID:
2310922
Report Number(s):
INL/JOU-22-66522-Revision-0
Journal Information:
Journal of Molecular Liquids, Journal Name: Journal of Molecular Liquids Vol. 385; ISSN 0167-7322