铥离子在氯化物熔体中还原的电化学行为

ELECTROCHEMICAL BEHAVIOUR FOR REDUCTION OF Tm￣(3+) IN MOLTEN CHLORIDES

用循环伏安法、恒电位电解断电后的电位一时间曲线及Ｘ射线衍射法研究Ｔｍ３＋在氯化物熔体中还原的电极过程。在Ｗ，Ｍｏ电极上Ｔｍ３＋首先还原为Ｔｍ２＋，然后析出金属Ｔｍ．在Ｎｉ电极上形成Ｔｍ－Ｎｉ合金后才析出金属Ｔｍ测定了Ｔｍ３＋在氯化物熔体中的扩散系数及扩散活化能，得到１ｎＤ＝－４．３５－５８．２×１０３／ＲＴ．

The electrode processes of Tm3+ in molten chlorides were investigated by cyclic voltammetry, open circuit potential-time curve after potentiostatic electrolysis and X-ray diffraction. Tm3+ is reduced to Tm2+ at first and then the metallic Tm is deposited on the W and Mo electrode respectively. The Tm-Ni alloys are formed at first and then the metallic Tm is deposited on Ni electrode. The diffusion coefficient and diffusion activation energy of Tm3+ in molten chlorides were determined. InD=-4.35-58.2x10￣3 /RT is obtained.