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High-Temperature Study in situ of Interaction between Lanthanum Oxide and FLiNaK Fluoride Melt by Raman Spectroscopy
Abstract
Using in situ Raman spectroscopy, a chemical mechanism for the interaction of lanthanum oxide with a molten fluoride mixture FLiNaK, promising for the use in molten salt nuclear reactors, has been established. High-temperature spectral studies, supplemented with the results of X-ray diffraction and thermodynamic modeling, proved the occurrence of an irreversible heterogeneous reaction La2O3s + 2LiFsol→2LaOFs + Li2Osol. It was shown that in the fluoride system under study, the reaction product (lanthanum oxyfluoride LaOF) forms hexagonal (R3m) and tetragonal (P4/nmm) crystalline modifications. The necessary information on the thermal behavior of vibration modes of lanthanum oxide La2O3 in the range of 20–600 ºС, and the mechanism and its interaction with water vapor in the air atmosphere were obtained.
About the Authors
I. D. Zakiryanova
Institute of High-Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences
Russian Federation
Russian Federation
Ekaterinburg
P. N. Mushnikov
Institute of High-Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences
Russian Federation
Russian Federation
Ekaterinburg
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For citations:
Zakiryanova I.D., Mushnikov P.N. High-Temperature Study in situ of Interaction between Lanthanum Oxide and FLiNaK Fluoride Melt by Raman Spectroscopy. Zhurnal Prikladnoii Spektroskopii. 2025;92(2):170-177. (In Russ.)
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