Abstract
Molten systems based on alkali metal halides with lithium oxide additives are promising as a working medium on pyrochemical reprocessing of nuclear waste. A mixture of alkali metal fluorides of eutectic composition (FLiNaK) is a suggesting solvent due to the high solubility of actinide oxides, low viscosity, high boiling points, low vapor pressure, and resistance to radiation damage. Thermal analysis, XRD, Raman spectroscopy and thermodynamic simulations were used to obtain evidences on the phase equilibria and liquidus points of the system (0.85 FLiNaK - 0.15 CeF3) - Li2O, containing up to 8.8 mol % lithium oxide. The solubility of lithium oxide in the fluoride melt FLiNaK - CeF3 and the thermodynamic parameters of dissolution were obtained. The eutectic point (the Li2O content is 3.1 mol %, Tm = 489??) and two peritectic points (lithium oxide content are 3.2 and 4.2 mol %, and liquidus points are 497 and 549??, respectively) were found. Thermodynamic simulation results show an exothermic effect due to interaction between lithium oxide and fluoride melt. The interaction product oxyfluoride CeOF was detected by XRD analysis and Raman spectroscopy.
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