Electrical conductivity of the molten systems of (LiF – CaF2)eut – NdF3 and (LiF – NaF)eut – NdF3

• Published in: Journal of molecular liquids Vol. 365; p. 120012
• Main Authors: Korenko, Michal, Krishnan, Dhiya, Šimko, František, Ambrová, Marta, Szatmáry, Lórant
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2022
• Subjects: Electrical conductivity; Electrometallurgy; Molten salt reactor; Molten salts electrolysis; Neodymium recycling; Rare earth elements; XRD; Neodymium recycling; Electrical conductivity; Rare earth elements; Molten salt reactor; Electrometallurgy; XRD; Molten salts electrolysis
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2022.120012

•The electrical conductivity data of the molten systems of (LiF – CaF2)eut – NdF3 and (LiF – NaF)eut – NdF3 for the first time experimentally collected.•The electrical conductivity of the molten systems of LiF – CaF2 – NdF3 and LiF – NaF – NdF3 increases with temperature and decreases with the content of NdF3.•The formation of the solid solutions Ca0.05Nd0.95F2.813 and Ca0.65Nd0.35F2.35. identified in the system of (LiF – CaF2)eut – NdF3.•The formation of the complex species NaNdF4 identified in the system of (LiF – NaF)eut – NdF3. The electrical conductivity of molten systems of (LiF – CaF2)eut – NdF3 and (LiF – NaF)eut – NdF3 was experimentally determined as a function of temperature and concentration of NdF3 (0 – 20 mol %). A platinum–rhodium electrode positioning in pyrolytic BN tube, graphite crucible, and altering current impedance spectroscopy were used for the study. The conductivity of both measured systems increases with the temperature and decreases with the increasing content of NdF3. The experimental data have been described by the linear regression and by the Arrhenius equation. The electrical conductivity of the molten system of (LiF – CaF2)eut – 5 mol % NdF3 has been identified to be 5.56 S.cm−1 compares to the electrical conductivity of the molten system of (LiF – NaF)eut – 5 mol % NdF3, 5.52 S.cm−1 (800 °C). The electrical conductivity of (LiF – CaF2)eut – 20 mol % NdF3 at the temperature of 800 °C is 4.02 S.cm−1, and the electrical conductivity of (LiF – NaF)eut – 20 mol % NdF3 is at the same temperature 3.46 S.cm−1. The XRD patterns of the solidified samples of the investigated systems (LiF – CaF2)eut – NdF3 and (LiF – NaF)eut – NdF3 were after the conductivity measurements also determined.