The Electrochemical Formation of Ni-Tb Intermetallic Compounds on a Nickel Electrode in the LiCl-KCl Eutectic Melts

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• 作者：Wei Han (1)
  Qingnan Sheng (1)
  Milin Zhang (1)
  Mei Li (1)
  Tingting Sun (1)
  Yaochen Liu (1)
  Ke Ye (1)
  Yongde Yan (1)
  Yingcai Wang (1)
  
• 刊名：Metallurgical and Materials Transactions B
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：45
• 期：3
• 页码：929-935
• 全文大小：
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• 作者单位：Wei Han (1)
  Qingnan Sheng (1)
  Milin Zhang (1)
  Mei Li (1)
  Tingting Sun (1)
  Yaochen Liu (1)
  Ke Ye (1)
  Yongde Yan (1)
  Yingcai Wang (1)
  
  1. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, P.R. China
  
• ISSN：1543-1916

文摘

The work presents an electrochemical study on the formation of Ni-Tb intermetallic compounds in the LiCl-KCl-TbCl3 melts on tungsten and nickel electrodes at 773?K (500?°C) by electrochemical techniques. For a tungsten electrode, cyclic voltammetry and square-wave voltammetry showed that the electrochemical reduction of Tb(III) proceeded in a one-step process involving three electrons at ?.06?V (vs Ag/AgCl). For a nickel electrode, the reduction potential of Tb(III)/Tb was observed at more positive values than those on W electrode by cyclic voltammetry, due to the formation of Ni-Tb intermetallic compounds. Square-wave voltammetry and open-circuit chronopotentiometry put into evidence the formation of intermetallic compounds at around ?.27, ?.63, and ?.88?V, respectively. Three alloy samples were obtained by potentiostatic electrolysis on a Ni electrode at various potentials and analyzed by X-ray diffraction, scanning electron micrograph, and energy-dispersive spectrometry. The analysis results confirmed the formation of Ni17Tb2, Ni5Tb, and Ni2Tb alloy compounds.