The present paper is dedicated to the quantitative determination of oxygen-containing impurities in the LiF-NaF-KF eutectic using electrochemical (cyclic and square-wave voltammetry) and reduction melting methods. The LiF-NaF-KF melt was analyzed before and after purifying electrolysis. The amount of oxygen-containing impurities removed from the salt during purification was determined. It was found that after electrolysis, the concentration of oxygen-containing impurities decreased by 7 times. The results obtained via electrochemical techniques and reduction melting were well-correlated, which made it possible to evaluate the quality of the LiF-NaF-KF F melt. To verify the analysis conditions, mechanical mixtures of LiF-NaF-KF containing LiO were analyzed using the reduction melting method. The oxygen concentration in the mixtures varied from 0.672 to 2.554 wt. %. Based on the analysis results, the dependence approximated by the straight line was obtained. These data may be used to draw calibration curves and to further develop the procedure of oxygen analysis of fluoride melts.
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http://dx.doi.org/10.3390/ma16114197 | DOI Listing |
Inorg Chem
January 2024
Department of Science of Environment and Mathematical Modeling, Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0394, Japan.
The formation of Si(II) by the comproportionation reaction between electrodeposited silicon and Si(IV) ions [Si(IV) + Si ⇄ 2Si(II)] in fluoride melts has been discussed in many previous reports on the electrochemical processing of silicon. In this study, the coordination structure of Si(II) ions in LiF-KF, LiF-NaF, NaF-KF, and LiF-NaF-KF melts was investigated by high-temperature Raman spectroscopy and quantum chemical calculation based on density functional theory. The formation of Si(II) ions was induced by mixing metallic silicon powder as the source of Si, with the melts containing hexafluoro silicate or silicon dioxide as the source of Si(IV) ions.
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June 2023
Institute of High Energy Physics, Chinese Academy of Sciences, No. 19B Yuquan Road, Shijingshan District, Beijing 100049, China.
RSC Adv
June 2023
Shanghai Institute of Applied Physics, Chinese Academy of Sciences Shanghai 201800 PR China +86 021 39194053 +86 021 39194053.
The electrochemical behavior of Cr in molten LiF-NaF-KF (46.5 : 11.5 : 42 mol%) (FLiNaK) was studied by cyclic voltammetry (CV) at 600 °C.
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July 2022
Institute of High Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences, 620067 Ekaterinburg, Russia.
The dynamic viscosity (η) of the molten system (NaF-KF)-NdF containing NdF in an amount from 0 to 15 mol.% was studied by rotational viscometry using a high-temperature rheometer, FRS 1600. Viscosity measurements were carried out in the temperature range from liquidus to 1153 K.
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January 2022
The Institute of High Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, St. Akademicheskaya 20, 620066 Ekatherinburg, Russia.
Molten fluorides of alkali metals are considered a technological medium for molten salt reactors (MSRs). However, these media are known to be extremely corrosive. The successful implementation of high-temperature technological devices using molten alkali metal fluorides requires the selection of such structural materials that have high corrosion resistance in melts with compositional characteristic of MSRs.
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