Fe_(2)O_(3)对NdF3-LiF-Nd_(2)O_(3)体系电导率的影响

Effect of Fe_(2)O_(3) on Electrical Conductivity of NdF3-LiF-Nd_(2)O_(3)

利用交流阻抗法和连续改变电导池常数法在氮化硼毛细管中测量熔盐NdF_(3)-LiF、NdF_(3)-LiF-Nd_(2)O_(3)、NdF_(3)-LiF-Fe_(2)O_(3)和NdF_(3)-LiF-Nd_(2)O_(3)-Fe_(2)O_(3)的电导率,探究了温度和熔盐成分对电导率的影响。在1100~1200℃,NdF_(3)-LiF(NdF_(3)∶LiF=7∶3)与1%Nd_(2)O_(3)组成的熔盐电解质的电导率最为稳定。温度、Fe_(2)O_(3)和Nd_(2)O_(3)的质量百分比相同情况下,Fe_(2)O_(3)对NdF_(3)-LiF电导率的影响小于Nd_(2)O_(3)对NdF_(3)-LiF电导率的影响,并且Fe_(2)O_(3)和Nd_(2)O_(3)组合添加对NdF_(3)-LiF电导率的影响远大于Fe_(2)O_(3)或Nd_(2)O_(3)单独添加对NdF_(3)-LiF电导率的影响。1200℃时,NdF_(3)-LiF-Nd_(2)O_(3)(1%~2%)-Fe_(2)O_(3)(1%~2%)的电导率相对稳定,Fe_(2)O_(3)含量对电导率的影响相对较小。在1100~1200℃,NdF_(3)-LiF(NdF_(3)∶LiF=9∶1)-Nd_(2)O_(3)(≤2%)-Fe_(2)O_(3)(≤2%)的电导率拟合公式为K=-2.71817+0.00615T-0.23978xNd_(2)O_(3)-0.28133xFe_(2)O_(3)。

Alternating current(AC)impedance spectroscopy technique and continuously vary cell constant(CVCC)technique were used to measure the electrical conductivity of NdF_(3)-LiF,NdF_(3)-LiF-Nd_(2)O_(3),NdF_(3)-LiF-Fe_(2)O_(3) and NdF_(3)-LiF-Nd_(2)O_(3)-Fe_(2)O_(3)molten salts in a boron nitride tube-type capillary cell.The effects of temperature and molten salt composition on the conductivity were investigated.The melts composed of NdF_(3)-LiF(NdF_(3)∶LiF of 7∶3)with 1%Nd_(2)O_(3)have shown the smallest conductivity variation in the temperature range of 1100-1200℃.Under the same weight percent of Fe_(2)O_(3) or Nd_(2)O_(3) and temperature,Fe_(2)O_(3) has less effects on the electrical conductivity of NdF_(3)-LiF than that of Nd_(2)O_(3),and the combination addition of Fe_(2)O_(3)and Nd_(2)O_(3)has resulted in the lowest conductivity than either addition of Fe_(2)O_(3)or Nd_(2)O_(3).The conductivity of NdF_(3)-LiF-Nd_(2)O_(3)(1%-2%)-Fe_(2)O_(3)(1%-2%)at 1200℃is more stable,and the effects of Fe_(2)O_(3)content on the conductivity at 1200℃is relatively small.The conductivity fitting formula of NdF_(3)-LiF(NdF_(3)∶LiF of 9∶1)-Nd_(2)O_(3)(≤2%)-Fe_(2)O_(3)(≤2%)at 1100-1200℃was also obtained:K=-2.71817+0.00615T-0.23978xNd_(2)O_(3)-0.28133xFe_(2)O_(3).