Volumetric properties of liquid and solid LiF–KF mixtures

• Published in: Thermophysics and aeromechanics Vol. 30; no. 4; pp. 747 - 755
• Main Authors: Khairulin, R. A., Abdullaev, R. N., Stankus, S. V., Meshalkin, A. B.
• Format: Journal Article
• Language: English
• Published: Novosibirsk Kutateladze Institute of Thermophysics SB RAS 01-07-2023; Springer Nature B.V
• Subjects: Eutectic composition; Gamma rays; Liquid phases; Liquidus; Lithium; Lithium fluoride; Melting points; Mixtures; Molar volume; Phase transitions; Physics; Physics and Astronomy; Potassium fluoride; Specific gravity; Thermal expansion; Thermodynamics; lithium fluoride; potassium fluoride; gamma method; melt; density; thermal expansion
• ISSN: 1531-8699; 0869-8643; 1531-8699
• DOI: 10.1134/S0869864323040133

The density of liquid mixtures of lithium and potassium fluorides with a content of 51.2 and 71.1 mol % LiF was measured using gamma-ray attenuation technique in the temperature range from liquidus to 1000–1190 K. For a mixture of near-eutectic composition (51.2 mol % LiF), the relative density change during the solid–liquid phase transition and the density in the solid state near the melting point were directly determined for the first time. The concentration dependences of the molar volume and volumetric coefficient of thermal expansion for the LiF–KF liquid system were plotted on the basis of the experimental and literature data. The obtained dependences were found to be close to the concentration dependences of the corresponding volumetric properties for ideal solutions.