Electrochemical Formation of Tb-Ni Alloys in a Molten LiCl-KCl-TbCl_3 System

摘要

The electrochemical formation of Tb-Ni alloys was investigated ina molten LiCl-KCl-TbCl_3(0.50 mol% added) at 723 K. Opencircuitpotentiometry was conducted using a Ni electrode afterelectrodepositing Tb metal at 0.20 V (vs. Li~+ / Li) for 300 s. Therewere four potential plateaus at (a) 0.66 V, (b) 0.80 V, (c) 0.95 Vand (d) 1.56 V, respectively. Alloy samples were prepared bypotentiostatic electrolysis at 0.60 V and 0.70 V at 723 K. The alloyphase was identified as only TbNi_2. Anodic dissolution of Tb fromthe formed TbNi_2 was conducted at 0.90 V, 1.20 V and 1.60 V,respectively. In the sample obtained at 0.90 V for 3 h, the existenceof TbNi_3 was identified by the XRD. Phase of the sample obtainedat 1.20 V for 3 h was TbNi_5. The sample obtained at 1.60 V for 3 hwas Ni.