The Electrochemical Formation of Ni-Tb Intermetallic Compounds on a Nickel Electrode in the LiCl-KCl Eutectic Melts
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INTRODUCTION
AS structural and functional materials, intermetallic compounds have attracted considerable attention due to their high potential for various applications.[1,2] Systems containing a rare earth metal in chemical union with one of the transition metals of the first long period contain intermetallic compounds with interesting physical and thermochemical properties and several of them are of great technological importance as starting materials for hydrogen storage and permanent magnet fabrication.[3] The intermetallic compound Ni17Tb2 displays an antiferromagnetic coupling[4] and the Tb-Ni-Fe alloys, having significant magnetostrictive properties and excellent processing performance, could provide material foundation for the development of new devices.[5] Conventional processing techniques used to produce intermetallic compounds are generally through a combination of melting, casting, powder grinding, and consolidation by hot pressing.[6] As we know, the use of molten salts, as reaction media, provides a unique opportunity for the electrowinning and electrorefining of high-purity rare earth metals, as well as for the electrochemical synthesis of their alloys.[7] Recently, the preparation of alloy compounds was studied by electro-
WEI HAN and MILIN ZHANG, Professors, QINGNAN SHENG, TINGTING SUN, YAOCHEN LIU, and YINGCAI WANG, Masters, MEI LI and YONGDE YAN, Vice-Professors, and KE YE, Lecturer, are with the 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. Contact e-mail: weih@ hrbeu.edu.cn Manuscript submitted May 20, 2013. METALLURGICAL AND MATERIALS TRANSACTIONS B
chemical codeposition and reduction on reactive electrode in molten salts. Zhang et al.[8] investigated the electrodeposition of CeNi2 intermetallic compound by constant potential electrolysis in CeO2-2NiO-LiCl molten salt. Iida et al.[9] investigated the codeposition of SmCo alloys by potentiostatic electrolysis in LiCl-KClSmCl3-CoCl2 molten salt. Wang et al.[10] investigated the electrodeposition of Co-La alloys by constant current electrolysis in urea melt. Some investigators focused on the preparation of intermetallic compounds by electrochemical reduction on a reactive electrode in molten salts. Iida et al.[11,12] studied the formation of SmNi5, SmNi3, and SmNi2 alloys in the LiCl-KClSmCl3 molten salts and Yb2Ni17 and YbNi2 alloys in the LiCl-KCl-YbCl3 molten salts on Ni electrode, respectively. Taxil groups[13] obtained NdNi2, NdNi3, GdNi2, GdNi, Ni2Sm, and Ni3Sm intermetallics compounds on a reactive nickel electrode by the electroreduction of the lanthanides (Nd, Gd, and Sm) in the LiF-CaF2-LnF3 molten salts. Our groups studied the preparation of the Al-Nd,[14] Al-Li-Eu,[15] Mg-Li-Sm,[16,17] and Mg-Li-Er alloys[18] by electrochemical codeposition and the Mg-Zr[19] and Mg-Li alloys[20] by electrochemical reduction on reactive magnesium electrode in molten salts, respectively. But the preparat
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