| In this paper, we investigated the electrochemistry behavior of praseodymium, erbium, holmium in LiCl-KCl (50:50 wt.%) molten salt on an inert electrode was studied by cyclic voltammetry (CV), chronopotentiometry (CP), chronoamperometry (CI), square wave voltammetry and open circuit chronopotentiometry. The co-deposition process of the of rare earth ion, magnesium ion and lithium-ion on the molybdenum electrode in the molten salts was studied. The results show that the the position of the rare earth peak (Pr, Er, Ho) in the CV (-2.1 V) was very close to position of the ions of magnesium (-1.9V), so it is difficult to identified the peak of rare earth and magnesium by cyclic voltammetry. The electrode process of rare earth ions in LiCl-KCl (50:50wt%) molten salt was controlled by the ions diffusion process. The diffusion process is reversible. Diffusion coefficient was calculated by cyclic voltammetry, chronopotentiometry and chronoamperometry873K Diffusion Coefficient of Pr (Ⅲ) and Ho (Ⅲ) in the LiCl-KCl (50:50 wt.%) Electrochemistry method The alloys of Mg-Li-RE was prepared by potentiostatic electrolysis, the content of the alloys was investigated by ICP (inductively coupled plasma atomic emission spectroscopy) analysis. The result shows that alloy content of magnesium and rare earth was controlled by the ions content in the molten salt, and lithium content in the alloys was mainly controlled by electrolysis potential. When the potential is -2.3 V the content of lithium in the alloys was less than 1%, and the lithium content was increased rapidly when the potential was more negative than -2.3V, the content of lithium was up to 20%when the electrolysis potential was -2.7V. The structure and the surface distribution of the alloy was investigated by XRD and SEM respectively. The distribution of the alloys was uniform, the element of Redistributes mainly along boundary in the alloys, and the alloys form a stable compounds such as Mg12Pr, HoMg2, Er5Mg24 and Li0.92Mg4.08·... |
PDF Full Text Request