Investigation of the Quasi-Binary Phase Diagram FLiNaK-NdF3

The NdF3 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-NdF3. The eutectic mixture FLiNaK was prepared by direct melting of components LiF, NaF...

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Autores principales:	Peter Mushnikov, Olga Tkacheva, Vladimir Voronin, Vladimir Shishkin, Yuriy Zaikov
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	molten salt reactor solubility FLiNaK neodymium trifluoride Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/b7ce47e2d81f4424920c28110d800aa7
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spelling	oai:doaj.org-article:b7ce47e2d81f4424920c28110d800aa72021-11-11T18:00:00ZInvestigation of the Quasi-Binary Phase Diagram FLiNaK-NdF<sub>3</sub>10.3390/ma142164281996-1944https://doaj.org/article/b7ce47e2d81f4424920c28110d800aa72021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6428https://doaj.org/toc/1996-1944The 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.Peter MushnikovOlga TkachevaVladimir VoroninVladimir ShishkinYuriy ZaikovMDPI AGarticlemolten salt reactorsolubilityFLiNaKneodymium trifluorideTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6428, p 6428 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	molten salt reactor solubility FLiNaK neodymium trifluoride Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	molten salt reactor solubility FLiNaK neodymium trifluoride Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Peter Mushnikov Olga Tkacheva Vladimir Voronin Vladimir Shishkin Yuriy Zaikov Investigation of the Quasi-Binary Phase Diagram FLiNaK-NdF<sub>3</sub>
description	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.
format	article
author	Peter Mushnikov Olga Tkacheva Vladimir Voronin Vladimir Shishkin Yuriy Zaikov
author_facet	Peter Mushnikov Olga Tkacheva Vladimir Voronin Vladimir Shishkin Yuriy Zaikov
author_sort	Peter Mushnikov
title	Investigation of the Quasi-Binary Phase Diagram FLiNaK-NdF<sub>3</sub>
title_short	Investigation of the Quasi-Binary Phase Diagram FLiNaK-NdF<sub>3</sub>
title_full	Investigation of the Quasi-Binary Phase Diagram FLiNaK-NdF<sub>3</sub>
title_fullStr	Investigation of the Quasi-Binary Phase Diagram FLiNaK-NdF<sub>3</sub>
title_full_unstemmed	Investigation of the Quasi-Binary Phase Diagram FLiNaK-NdF<sub>3</sub>
title_sort	investigation of the quasi-binary phase diagram flinak-ndf<sub>3</sub>
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b7ce47e2d81f4424920c28110d800aa7
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Investigation of the Quasi-Binary Phase Diagram FLiNaK-NdF<sub>3</sub>

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