Phase Diagram of the Quasibinary System LiF–NaF–KF–CeF3

• Published in: Atomic energy (New York, N.Y.) Vol. 131; no. 5; pp. 263 - 267
• Main Authors: Mushnikov, P. N., Tkacheva, O. Y.u, Kholkina, A. S., Zaikov, Yu. P., Shishkin, V. Yu, Dub, A. V.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.03.2022; Springer Nature B.V
• Subjects: Calorimetry; Carbon; Cooling; Differential scanning calorimetry; Energy industry; Fission products; Fissionable materials; Fluorides; Hadrons; Heavy Ions; Investigations; Liquidus; Lithium; Lithium fluoride; Molten salt nuclear reactors; Nuclear Chemistry; Nuclear Energy; Nuclear fuels; Nuclear Physics; Nuclear power plants; Nuclear reactors; Phase diagrams; Physics; Physics and Astronomy; Potassium; Potassium fluoride; Reactors; Salt; Salts; Sodium fluoride; Solidus; Solubility; Temperature; Thermal analysis
• ISSN: 1063-4258; 1573-8205
• DOI: 10.1007/s10512-022-00876-2

A eutectic mixture of lithium, sodium, and potassium fluorides is considered as a fuel salt for molten-salt reactors. For this reason, information about the solubility in it of fluorides of fissile materials and fission products is the most important when choosing a salt composition for a molten-salt reactor. In this work, the liquidus and solidus temperatures of the LiF–NaF–KF–CeF 3 quasi-binary system are determined by thermal analysis and differential scanning calorimetry. The system has one eutectic point at CeF 3 content 3 mol.% and temperature 445°C and three peritectic points – 7.5, 15, and 20.5 mol.% at 472, 512, and 600°C, respectively. The solubility of CeF 3 in LiF–NaF–KF is 10 mol.% at 500°C and reaches 25 mol.% at 665°С.