DyCl_3在混合溶剂(DMF-H_2O)中热力学性质的研究  

Study on Thermodynamics of DyCl_3 in DMF and H_2O Mixture Solvent

作　　者：王卫东[1] 

机构地区：[1]湖北师范学院化学与环境工程系,湖北黄石435002

出　　处：《稀土》2006年第3期65-68,共4页Chinese Rare Earths

基　　金：湖北师范学院科研项目(2003B10);湖北师范学院人才引进资助科研项目(2004R02)

摘　　要：应用电导法测定了298K时D yC l3在混合溶剂(DM F-H2O)中的活度系数和电导率,利用公式计算了D yC l3的摩尔电导率,应用D ebye-Hücker和O sager-F a lkenhangen公式计算了D yC l3在混合溶剂(DM F-H2O)中的活度系数,并讨论了在298K时浓度对D yC l3溶液活度系数的影响,随氯化稀土溶液浓度增加,稀土盐溶液的活度系数降低。计算了D yC l3在混合溶剂中的相对偏摩尔自由能,对其相对偏摩尔自由能的某些变化规律作了初步的讨论。In this paper, we determined activity coefficient and electric conductivity of DyCl3 in DMF and H2O at 298K with conductivity method,The use of formula has calculated the molar conductivity λ of DyCl3 in DMF and H2O at 298K,The use of Debye-Huecker and Osager-Falkenhangen formula has calculated the activity coefficient of DyCl3 in DMF and H2O at 298K and discussed the effect of concentration on activity coefficient of electrolyte solution at 298K, With the increasing of the concentration of DyCl3 in the solution, the activity coefficient of DyCl3 in the solution got lower. The relative partial molar free energies（G B,R）of DyCl3 in DMF and H2O mixed solvent have been calculated at 298K, and the behaviors of change of relative partial molar properties of DyCl3 in DMF and H2O mixed solvent were discussed on the bases of theory of electrolytic solution.

关 键 词：电导法 活度系数 DYCL3 混合溶剂 相对偏摩尔自由能 DMF(N N-二甲基甲酰胺) 

分 类 号：O646.1[理学—物理化学]