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<p>An in situ Raman spectroscopy study has established a chemical mechanism for the interaction of gadolinium oxide with a molten fluoride mixture, FLiNaK, a promising medium for pyrochemical reprocessing of spent uraniumgadolinium oxide nuclear fuel. High-temperature spectral studies along with the use of x-ray phase analysis have indicated an irreversible heterogeneous reaction Gd<sub>2</sub>O<sub>3</sub> (s) + 2LiF (soln) → 2GdOF (s) + Li<sub>2</sub>O (soln). The influence of temperature on the kinetics and completeness of the reaction has been established. When the temperature increases, the interaction process accelerates, the equilibrium content of Gd<sub>2</sub>O<sub>3</sub> decreases, and that of GdOF increases. The reaction product (gadolinium oxyfluoride GdOF) has been shown to form a trigonal (R3m) crystal modification. The reactivities of Gd<sub>2</sub>O<sub>3</sub> and La<sub>2</sub>O<sub>3</sub> in the fluoride melt FLiNaK differed.</p>

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Interaction Between Gadolinium Oxide and FLiNaK Fluoride Melt According to Raman Spectroscopy

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • I. D. Zakiryanova

摘要

An in situ Raman spectroscopy study has established a chemical mechanism for the interaction of gadolinium oxide with a molten fluoride mixture, FLiNaK, a promising medium for pyrochemical reprocessing of spent uraniumgadolinium oxide nuclear fuel. High-temperature spectral studies along with the use of x-ray phase analysis have indicated an irreversible heterogeneous reaction Gd2O3 (s) + 2LiF (soln) → 2GdOF (s) + Li2O (soln). The influence of temperature on the kinetics and completeness of the reaction has been established. When the temperature increases, the interaction process accelerates, the equilibrium content of Gd2O3 decreases, and that of GdOF increases. The reaction product (gadolinium oxyfluoride GdOF) has been shown to form a trigonal (R3m) crystal modification. The reactivities of Gd2O3 and La2O3 in the fluoride melt FLiNaK differed.