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<p>An in situ Raman spectroscopy study has established a chemical mechanism for the interaction of lanthanum oxide with a molten fluoride mixture, FLiNaK, which holds promise for use in molten salt nuclear reactors. Hightemperature spectral studies along with the use of x-ray phase analysis and thermodynamic modeling have indicated an irreversible heterogeneous reaction La<sub>2</sub>O<sub>3s</sub> + 2LiF<sub>sol</sub> → 2LaOF<sub>s</sub> + Li<sub>2</sub>O<sub>sol</sub>. The reaction product in this fluoride system (lanthanum oxyfluoride, LaOF) has been shown to form hexagonal (R3m) and tetragonal (P4/nmm) crystal modifications. Data were obtained on the thermal behavior of the vibrational modes of lanthanum oxide La<sub>2</sub>O<sub>3</sub> in the range 20–600oC and its interaction with atmospheric water vapor.</p>

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High-Temperature Raman Spectroscopy Study of the in situ Interaction Between Lanthanum Oxide and FLiNaK Fluoride Melt

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • I. D. Zakiryanova,
  • P. N. Mushnikov

摘要

An in situ Raman spectroscopy study has established a chemical mechanism for the interaction of lanthanum oxide with a molten fluoride mixture, FLiNaK, which holds promise for use in molten salt nuclear reactors. Hightemperature spectral studies along with the use of x-ray phase analysis and thermodynamic modeling have indicated an irreversible heterogeneous reaction La2O3s + 2LiFsol → 2LaOFs + Li2Osol. The reaction product in this fluoride system (lanthanum oxyfluoride, LaOF) has been shown to form hexagonal (R3m) and tetragonal (P4/nmm) crystal modifications. Data were obtained on the thermal behavior of the vibrational modes of lanthanum oxide La2O3 in the range 20–600oC and its interaction with atmospheric water vapor.