Investigation of the Quasi-Binary Phase Diagram FLiNaK-NdF<sub>3</sub>
The NdF<sub>3</sub> solubility in molten eutectic FLiNaK, which is a conceivable medium for a molten salt reactor (MSR), was determined by the quasi-binary phase diagram FLiNaK-NdF<sub>3</sub>. The eutectic mixture FLiNaK was prepared by direct melting of components LiF, NaF...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/b7ce47e2d81f4424920c28110d800aa7 |
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| Sumario: | The NdF<sub>3</sub> solubility in molten eutectic FLiNaK, which is a conceivable medium for a molten salt reactor (MSR), was determined by the quasi-binary phase diagram FLiNaK-NdF<sub>3</sub>. The eutectic mixture FLiNaK was prepared by direct melting of components LiF, NaF and KF·HF. The acidic anhydrous salt (KF·HF) was used instead of the hygroscopic KF. The NdF<sub>3</sub> was sintered by hydrofluorination of Nd<sub>2</sub>O<sub>3</sub>. The oxygen impurity in the prepared eutectic FLiNaK, determined by an oxygen analyzer LECO OH836, was 0.036 wt.%, whereas the NdF<sub>3</sub> contained 0.04 wt.% of oxygen. A part of the FLiNaK-NdF<sub>3</sub> quasi-binary phase diagram was obtained using two thermal analysis techniques: differential thermal analysis (DTA) and differential scanning calorimetry (DSC). The FLiNaK-NdF<sub>3</sub> phase diagram in the region of 0–30 mol.% NdF<sub>3</sub> contains one eutectic at 2 mol.% NdF<sub>3</sub> and 450 °C and two peritectic points: 8 mol.% NdF<sub>3</sub> at 500 °C and 22 mol.% NdF<sub>3</sub> at 575 °C. The region of the FLiNaK-NdF<sub>3</sub> phase diagram below the liquidus line is rather complicated due to the complex structure of the multicomponent system in its molten state, as in its solid state. The NdF<sub>3</sub> solubility in FLiNaK is about 5 mol.% at 490 °C and 29 mol.% at 700 °C; this means that the process of the MA transmutation in the MSR can be carried out in molten FLiNaK with a content of actinides as high as 15–20 mol.% in the temperature range of 550–650 °C. |
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