摘要
用线性扫描伏安法、恒电势电解断电后的电势——时间曲线法及电解产物的 X 射线分析等方法研究了 NaF—CaF_2—Dy_2O_3熔体中 Dy(Ⅲ)的电化学行为。在铂电极上 Dy(Ⅲ)的还原是分两步进行的:Dy^(3+)+3e→Dy^+,Dy^++e→Dy;并测得 Dy(Ⅲ)在该熔体中的扩散系数是(1.2±0.1)×10^(-9)m^3·s^(-1)(940C°)。镝在铁电极上的还原有强烈的去极化作用,形成镝—铁金属间化合物:Dy_2Fe_(17),Dy_6Fe_(23),DyFe_3,DyFe_2。
In this paper,the electrochemical behaviors of Dy (Ⅲ) on Pt electrode in fluoride melts (NaF--CaF_2--DyF_3--Dy_2O_3) have been studied by use of linear sweep voltammetry,cyclic voltammetry,potential —time curves after constant potential electrolysis,X—ray diffraction analysis and other methods.The experiment results show that the reaction of Dy (Ⅲ) on Pt electrode prodeeds in two consecutive steps,namely: Dy^(3+)+2e→Dy^+,and Dy^++e→Dy.It is identified that the diffusion coefficient of Dy(Ⅲ) in fluoride melts is (1.2±0.1)×10^(-5) cm^2·s^(-1) at 940℃.On Fe electrode in fluoride melts,compounds of Dy and Fe—— Dy_2Fe_(17) Dy,Fe_(23),DyFe_3,DyFe_2——have been prodùced.
基金
国家自然科学基金
关键词
镝
熔体
氟化合物
电化学
dysprosium
fluoride melt
compounds of Dy—Fe
