4.7 Article

Speciation of dysprosium in molten LiCl-KCl-CsCl eutectic: An electrochemistry and spectroscopy study

Journal

JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 904, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2021.115955

Keywords

Molten alkali metal chlorides; Dysprosium chloride; Electrochemical reactions; Electronic absorption spectroscopy; Kinetic and thermodynamic properties

Funding

  1. SinoRussian Cooperation Fund of Harbin Engineering University [2021HEUCRF004]

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The speciation and behavior of dysprosium (III) chloride in the ternary low melting LiCl-KCl-CsCl eutectic was studied using electrochemistry and spectroscopy techniques. The study found a subtle decomposition of Dy(III) to Dy(II) chloro-species at high temperatures. Additionally, the cathodic reduction of Dy(III) ions was investigated in an inert atmosphere.
Speciation and behavior of dysprosium (III) chloride in the ternary low melting LiCl-KCl-CsCl eutectic was studied by electrochemistry and spectroscopy techniques. Electronic absorption spectra of Dy(III) ions were recorded at 723-1023 K. Prolonged holding of relatively concentrated DyCl3 solutions in the melt resulted in a very subtle decomposition of Dy(III) to Dy(II) chloro-species. Cathodic reduction of Dy(III) ions on inert molybdenum electrode was studied at 623-973 K in the inert atmosphere by transient electrochemical techniques (cyclic and square-wave voltammetry). In dilute solutions the cathodic reduction of Dy(III) ions was irreversible, proceeded in one stage, and was controlled by the charge transfer. The diffusion coefficients of [DyCl6]3- complex ions in fused LiCl-KCl-CsCl eutectic were determined at different temperatures. The apparent standard potential of Dy(III)/Dy couple was determined by the open-circuit potentiometry and the principal thermodynamic properties of dysprosium trichloride in fused solvent were calculated.

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