交流阻抗法测定电解制备Sm_(2) Fe_(17)合金熔盐体系电导率的研究  

Study on the Determination of Conductivity of Molten Salt System of Sm_(2)Fe_(17) Alloy Electrolysis by AC Impedance

作　　者：李丽丽 闫奇操 LI Li-li;YAN Qi-cao(Gannan Healthcare Vocational College,Ganzhou 341000,China;Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341000,China)

机构地区：[1]赣南卫生健康职业学院,江西赣州341000 [2]中国科学院赣江创新研究院,江西赣州341000

出　　处：《稀土》2024年第5期45-55,I0004,共12页Chinese Rare Earths

基　　金：北京科技大学钢铁冶金新技术国家重点实验室开放基金项目(K22-02)。

摘　　要：CaCl_(2)-CaF_(2)-SmCl_(3)电解质体系的电导率变化规律直接影响电解制备单相Sm_(2)Fe_(17)合金过程。本文使用交流阻抗法系统地研究了CaCl_(2)、CaCl_(2)-CaF_(2)和CaCl_(2)-CaF_(2)-SmCl_(3)熔盐体系电导率的影响因素和变化规律,研究发现随着熔盐体系温度的升高和SmCl_(3)含量的提高,熔盐阻抗值降低,电导率增大,熔盐电导率为0.441S/cm~0.672S/cm;随着熔盐中SmCl_(3)含量的提高,熔盐电导活化能降低。通过对熔盐电导率进行拟合,分别获得了在1173K~1373K温度下,CaCl_(2)-CaF_(2)摩尔比为1∶1时,SmCl_(3)浓度在0~5%(摩尔分数)范围内熔盐电导率与熔盐体系温度和熔盐中SmCl_(3)含量的函数关系式,为熔盐电解法制备单相Sm_(2)Fe_(17)合金奠定了坚实的理论基础。The preparation process of single-phase Sm_(2)Fe_(17) alloy is directly influenced by the conductivity change of the CaCl_(2)-CaF_(2)-SmCl_(3) molten salt system.In this study,AC impedance was employed to systematically investigate the influencing factors and variation patterns of the conductivity in CaCl_(2),CaCl_(2)-CaF_(2),and CaCl_(2)-CaF_(2)-SmCl_(3) molten salt systems.It was observed that as the temperature and SmCl_(3) content increased in the molten salt,the impedance value decreased while electrical conductivity increased.The conductivity range of the molten salt was determined to be 0.441 S/cm~0.672 S/cm.Additionally,with an increase in SmCl_(3) content within the molten salt,its activation energy for conductivity decreased accordingly.By fitting the data on molten salt’s conductivity,a functional relationship between temperature and SmCl_(3) content(ranging from 0 to 5%,mole fraction)in a CaCl_(2)-CaF_(2) mole ratio of 1∶1 at temperatures ranging from 1173 K to 1373 K was established;these findings provide a theoretical foundation for electrochemical synthesis of single-phase Sm_(2)Fe_(17) alloy.

关 键 词：电导率 氯化钐 熔盐 平衡方程 交流阻抗 

分 类 号：TF111.52[冶金工程—冶金物理化学]