Effect of fluoride ions on coordination structure of titanium inmolten NaCl–KCl

Shanshan Liu; Shaolong Li; Chenhui Liu; Jilin He; Jianxun Song

doi:10.1007/s12613-022-2527-z

Volume 30 Issue 5

May 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(5): 868-876

Shanshan Liu, Shaolong Li, Chenhui Liu, Jilin He, and Jianxun Song, Effect of fluoride ions on coordination structure of titanium inmolten NaCl–KCl, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 868-876. https://doi.org/10.1007/s12613-022-2527-z

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Shanshan Liu, Shaolong Li, Chenhui Liu, Jilin He, and Jianxun Song, Effect of fluoride ions on coordination structure of titanium inmolten NaCl–KCl, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 868-876. https://doi.org/10.1007/s12613-022-2527-z

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Research Article

Effect of fluoride ions on coordination structure of titanium inmolten NaCl–KCl

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Corresponding author:
Jianxun Song E-mail: songjx00@163.com
Received: 27 May 2022; Revised: 12 July 2022; Accepted: 13 July 2022; Available online: 14 July 2022

Abstract

Abstract

The effects of fluoride ions (F⁻) on the electrochemical behavior and coordination properties of titanium ions (Tiⁿ⁺) were studied in this work, by combining electrochemical and mathematical analysis as well as spectral techniques. The α was taken as a factor to indicate the molar concentration ratio of F⁻ and Tiⁿ⁺. Cyclic voltammetry (CV), square wave voltammetry (SWV), and open circuit potential method (OCP) were used to study the electrochemical behavior of titanium ions under conditions of various α, and in-situ sampler was used to prepare molten salt samples when α equal to 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, and 8.0. And then, samples were analyzed by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The results showed that F⁻ in molten salt can reduce the reduction steps of titanium ions and greatly affects the proportion of valence titanium ions which making the high-valence titanium content increased and more stable. Ti²⁺ cannot be detected in the molten salt when α is higher than 3.0 and finally transferred to titanium ions with higher valence state. Investigation revealed that the mechanism behind those phenomenon is the coordination compounds ($\text{TiCl}_{j}\text{F}_{i}^{m-}$) forming.
- molten salt;
- sodium chloride–potassium chloride;
- ratio of fluoride and titanium ions;
- coordination mechanism

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