Electroreduction of Ho3+ on Nickel Cathode in Molten KCl-HoCl3
来源期刊：JOURNAL OF RARE EARTHS2000年第1期
论文作者：YANG Qi-qin SU Yu-zhi LIU Guan-kun
Key words：rare earths; electroreduction of Ho3+; molten KCl-HoCl3; Ho-Ni alloy; free energy of formation; diffusion coefficient;
Abstract: The cyclic voltammetry, open current potential-time curve after potentiostatic electrolysis, the current-time curve at potential step, XRD, EDAX and EPMA were used to study the electrode process of Ho3+ reduction on nickel electrode in molten KCl-HoCl3 and the phases of surface alloy layer. The Ho-Ni alloys were deposited when Ho3+ was reduced on the nickel electrode. The free energies of formation for the intermetallic compounds between Ho and Ni, the diffusion coefficients and diffusion activation energy of Ho atom in the alloy phase were determined.
YANG Qi-qin1，SU Yu-zhi2，LIU Guan-kun1
(1.Department of Chemistry, Zhongshan University, Guangzhou 510275, China;
2.Department of Chemistry, Guangzhou Normal University, Guangzhou 510400, China)
Abstract:The cyclic voltammetry, open current potential-time curve after potentiostatic electrolysis, the current-time curve at potential step, XRD, EDAX and EPMA were used to study the electrode process of Ho3+ reduction on nickel electrode in molten KCl-HoCl3 and the phases of surface alloy layer. The Ho-Ni alloys were deposited when Ho3+ was reduced on the nickel electrode. The free energies of formation for the intermetallic compounds between Ho and Ni, the diffusion coefficients and diffusion activation energy of Ho atom in the alloy phase were determined.
Key words:rare earths; electroreduction of Ho3+; molten KCl-HoCl3; Ho-Ni alloy; free energy of formation; diffusion coefficient;
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