Citation: XUE Yun, WANG Qian, YAN Yong-De, CHEN Lang, ZHANG Mi-Lin, ZHANG Zhi-Jian. Direct Electrochemical Reduction of Sm2O3 and Formation of Al-Sm Alloys in LiCl-KCl-AlCl3 Melts[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(9): 1947-1951. doi: 10.3969/j.issn.1001-4861.2013.00.282
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Direct electrochemical reduction of Sm2O3 and formation of Al-Sm alloys were investigated in LiCl-KCl melts by using additive AlCl3 at 803 K. The electrochemical behaviors of Sm2O3 and SmCl3 raw material in LiCl-KCl-AlCl3 melts were characterized by cyclic voltammetry and square wave voltammetry. Galvanostatic electrolysis was carried out to extract Sm element from LiCl-KCl-AlCl3 melts, and the deposits were characterized by X-ray diffraction (XRD). The numbers and potential regions of the peaks obtained from the two systems are almost the same, indicating that the Sm2O3 is chloridized by AlCl3 in the LiCl-KCl melt. The chronopotentiometry result indicates that the coreduction of Al and Sm occurs when the cathodic current is more negative than-139.8 mA·cm-2. Al-Sm alloys with different phases can be obtained by adjusting the concentration of AlCl3 and Sm2O3.
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