Electrochemical and spectro-electrochemical study of the ytterbium behavior in the molten eutectic mixture of sodium chloride and cesium chloride

A.B. Ivanov, A.A. Sobolev, V.A.Volkovich, B.D. Vasin

KEYWORDS:

rare-earth elements, ytterbium, chloride melts, electron absorption spectra, high-temperature spectroscopy, spectro-electrochemistry, cyclic voltammetry, red-ox potential, diffusion coefficient, thermodynamics.

ABSTRACT:

The ytterbium trichloride behavior in melts based on the NaCl-2CsCl eutectic mixture in the temperature range of 550-750°C was studied by cyclic voltammetry and spectro-electrochemistry; the diffusion coefficients of the YbCl63- ions, values of the Yb(III) /Yb(II) redox potential, the Gibbs energy change, and conditional equilibrium constant of the formation reaction of the ytterbium trichloride from dichloride were determined. Spectro-electrochemical investigation of the Yb(III) →Yb(II) reduction process in conditions of potentiostatic electrolysis at 550°C was carried out. The interaction of Yb (III) ions with metallic zirconium in the NaCl-2CsCl melt at 550°C was revealed by high-temperature electron absorption spectroscopy.

 

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