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To help address the need for predicting radiative heat transfer (RHT)behavior of molten salts, we conducted a comprehensive review of methods anddata from infrared optical spectroscopic measurements on molten fluoride salts.Transmittance, reflectance, and trans-reflectance experimental methods arediscussed, along with the corresponding data reduction methodology and thelimitations of each technique. Optical spectroscopy is a convenient indirectprobe 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 alkalineearth fluoride solvents are compiled, and the corresponding structuralinterpretation is discussed and compared with other experimental andtheoretical work. We find that solvent and solute vibrational absorption can besignificant in the mid-infrared, resulting in near-infrared edges ofsignificance to RHT. Extrapolation and averaging of existing edge data leads toestimated gray absorption coefficient values at 700 degrees C of 493 m^(-1) forFLiBe and 148 m^(-1) for FLiNaK, both within the range of 1 to 6000 m^(-1)identified to be of engineering relevance for radiative heat transfer analysis.

Infrared Optical Spectroscopy of Molten Fluorides: Methods, Electronic  and Vibrational Data, Structural Interpretation, and Relevance to Radiative  Heat Transfer