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９７３ＫＮａＣｌＫＣｌ熔体中的扩散系数分别为１．５×１０－５和１．０×１０－５ｃｍ２·ｓ－１。用自耗阴极法在１１２３Ｋ，阴极电流密度２０Ａ·ｃｍ－２，ＫＣｌＹｂＣｌ３（３０％）熔体中制取了ＹｂＣｕ合金 The electrochemical behavior and diffusion coefficient of Yb (Ⅲ) reduction on Cu electrode in equimolar NaCl-KCl melt were studied by linear sweep voltammetry. The results show that Yb (Ⅲ) is reversibly reduced to Yb (Ⅱ) and Yb (Ⅱ) is further reduced to form an alloy with Cu: Yb3 ++ e = Yb2 +, Yb2 ++ 2e + nCu = YbCun. The diffusion coefficients of Yb (Ⅲ) and Yb (Ⅱ) in 973KNaClKCl melt were determined to be 1.5 × 10-5 and 1.0 × 10-5cm2 · s-1, respectively. YbCu alloy was prepared by selfconsuming cathodic method at 1123K and cathodic current density of 20A · cm2 and KClYbCl3 (30%) melt