NdF_3-LiF-Nd_2O_3系熔盐电导率的CVCC法研究

确定了采用交流阻抗技术使用CVCC法测定NdF3-LiF-Nd2O3系熔盐电导率的合理参数,认为CVCC公式中的Z′应选择由Nyquist图拟合所得的熔盐电阻和电极及导线电阻之和;读取高频率时的电路总阻抗的电阻部分也是个合理的选择.在此基础上,研究了NdF3-LiF-Nd2O3系熔盐电导率,获得了电导率关于温度和熔盐组成的线性回归方程,κ(S.cm-1)=-2.111+0.005323t(℃)+0.03220wLiF(%)-0.1026wNd2O3(%).对该方程进行分析认为,该系熔盐电导率随着温度和熔盐中LiF质量分数的增加而增加;而随着Nd2O3的质量分数的增加而减少.

Study on the Electrical Conductivity of NdF3-LiF-Nd2O3 System Melts Determined by CVCC Technique

With AC impedance method used, the rational parameters of electrical conductivity of NdF3-LiF-Nd2O3 system melts measured by Continuously Varying Cell Constant (CVCC) technique was determined. It was deemed that the Z′ value in CVCC formula should be selected as the sum of the resistances of melt and both electrode and conductor by fitting on the Nyquist diagram. And reading the real part of the total circuit impedance at high frequency was also a rational selection. Then, the electrical conductivity of NdF3-LiF-Nd2O3 system melts was investigated experimentally to get the linear regression equation of the conductivity in relation to temperature and melt composition, i.e., k(S·cm^-1)=-2.111+0.005323 t(°C)+0.03220 wLiF (%)-0.1026 wNd2O3(%). Analyzing the equation, a conclusion is drawn that the electrical conductivity of the melts increases with temperature and LiF mass fraction, but decreases with increasing Nd2O3 mass fraction.