氯化物熔体中镱铜中间合金的形成和电解制备
来源期刊：中国有色金属学报1998年第4期
论文作者：刘冠昆 童叶翔 洪惠婵 杨绮琴 陈胜阳
文章页码：663 - 667
关键词：镱离子； Yb-Cu合金； 电还原； 熔盐； 制备
Key words：Yb(Ⅲ) ion; Yb-Cu alloy; electroreduction; molten salt; preparation
摘 要：利用线性扫描伏安法研究了Yb(Ⅲ)在等摩尔NaCl-KCl熔体中Cu电极上还原的电化学行为及扩散系数。结果表明: Yb(Ⅲ)第一步可逆还原为Yb(Ⅱ)，Yb(Ⅱ)进一步还原并与Cu形成合金： Yb3++e=Yb2+, Yb2++2e+nCu=YbCun。 测定了Yb(Ⅲ)和Yb(Ⅱ)在973K NaCl-KCl熔体中的扩散系数分别为1.5×10-5和1.0×10-5 cm2s-1。用自耗阴极法在1123K, 阴极电流密度20 Acm-2, KCl-YbCl3(30%)熔体中制取了YbCu合金。
Abstract: Linear sweep voltammetry has been used to study the redox of Yb(Ⅲ) in equimolar NaCl-KCl melt on the Cu cathode. It is reasonable to presume that the reduction of Yb(Ⅲ) to Yb(Ⅱ) is reversible on Cu electrode at first step and Yb(Ⅱ) is reduced to form alloy with Cu on Cu electrode surface: Yb3++e=Yb2+, Yb2++2e+nCu=YbCun. The diffusion coefficients of Yb(Ⅲ) and Yb(Ⅱ) in NaCl-KCl melt at 973 K are 1.5×10-5 and 1.0×10-5 cm2·s-1, respectively. The Yb-Cu alloy was prepared by consumable cathode in molten chlorides. The Yb-Cu alloy contains about 15% of Yb.
