Electrochemical Formation of Tb Alloys in Molten LiCl–KCl Eutectic Melts and Separation of Tb

  • Hirokazu KonishiEmail author
  • Hideki Ono
  • Tetsuo Oishi
  • Toshiyuki Nohira
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


The electrochemical formation of Tb-Ni alloys was investigated in a molten LiCl–KCl–TbCl3 (0.50 mol% added) at 723 K. Open-circuit potentiometry was conducted using a Ni electrode after electrodepositing Tb metal at 0.20 V (vs. Li+/Li) for 300 s. There were four potential plateaus at (a) 0.66 V, (b) 0.80 V, (c) 0.95 V and (d) 1.56 V, respectively. Alloy samples were prepared by potentiostatic electrolysis at 0.60 and 0.70 V at 723 K. The alloy phase was identified as only TbNi2. Anodic dissolution of Tb from the formed TbNi2 was conducted at 0.90, 1.20 and 1.60 V, respectively. In the sample obtained at 0.90 V for 3 h, the existence of TbNi3 was identified by the XRD. Phase of the sample obtained at 1.20 V for 3 h was TbNi5. The sample obtained at 1.60 V for 3 h was Ni. Alloy samples were prepared by potentiostatic electrolysis at 0.50–0.80 V for 1 h using Ni plate cathodes in a molten LiCl–KCl containing TbCl3 (0.50 mol%) and NdCl3 (0.50 mol%). The highest mass ratio of Tb/Nd in the alloy sample was 56 at 0.70 V.


Rare earth Electrolysis Molten salt Separation 


  1. 1.
    Oishi T et al (2010) Kagaku Kogaku Ronbunshu, vol 36. Soc Chemical Eng Japan, Bunkyo-ku, Tokyo, pp 299–303Google Scholar
  2. 2.
    Kobayashi S et al (2011) J Electrochem Soc 158:E142–146 (Pennington, NJ: Electrochemical Soc Inc.)Google Scholar
  3. 3.
    Kobayashi S et al (2012) J Electrochem Soc 159:E193–197 (Pennington, NJ: Electrochemical Soc Inc.)Google Scholar
  4. 4.
    Konishi H et al (2011) Molten salts 54:21–28 (Suita, Osaka: Molten Salt Committee of The Electrochemical Society in Japan)Google Scholar
  5. 5.
    Konishi H et al (2012) ECS Trans 50:463–472 (Pennington, NJ: Electrochemical Soc Inc.)Google Scholar
  6. 6.
    Yao Q, Wang Y, Zhou H (2005) J Alloys Comp 395:98–100 (Lausanne, Vaud: Elsevier Science Sa)Google Scholar

Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • Hirokazu Konishi
    • 1
    Email author
  • Hideki Ono
    • 1
  • Tetsuo Oishi
    • 2
  • Toshiyuki Nohira
    • 3
  1. 1.Osaka UniversitySuitaJapan
  2. 2.National Institute of Advanced Industrial Science and TechnologyTsukubaJapan
  3. 3.Kyoto UniversityGokasho, UjiJapan

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