KNb_(0.9)Mg_(0.1)O_(3-a)固体电解质的合成及其离子导电性  

Synthesis and Ionic Conductivity of KNb_(0.9)Mg_(0.1)O_(3-a) Solid Electrolyte

作　　者：向军[1] 李莉萍[2] 

机构地区：[1]华东船舶工业学院数理系,江苏镇江212003 [2]吉林大学物理系,吉林长春130023

出　　处：《材料科学与工程学报》2004年第3期393-396,共4页Journal of Materials Science and Engineering

摘　　要：利用高温高压法制备了具有正交钙钛矿结构的KNb0 9Mg0 1 O3 a固体电解质。阻抗谱分析发现 ,样品的晶界效应比较明显 ,电导率主要取决于晶界电导。根据测得的阻抗谱 ,提出了等效电路。通过对阻抗谱数据进行拟合 ,获得了晶粒、晶界及总电导率。在测量温度范围内 ,电导率与温度成线性关系 ,满足Arrhenius经验公式。Mg2 + 掺杂显著提高了样品的电性能 ,70 0℃时KNb0 9Mg0 1 O3-a的氧离子电导率为 1 2× 10 - 3S cm。The solid electrolyte KNb_ 0.9 Mg_ 0.1 O_ 3- a with orthorhombic perovskite structure was prepared with high temperature and high pressure method.The impedance spectrum analyses showed that the grain-boundary effect was very obvious and the electrical conductivity was controlled by grain-boundary processes.Equivalent circuit was proposed according to the measured impedance spectrum.By fitting the impedance data,we obtained the grain,grain-boundary and total ionic conductivity of KNb_ 0.9 Mg_ 0.1 O_ 3- a .The temperature dependence of conductivity was linear in the measured temperature range,which satisfied the Arrhenius empirical formula.Mg-doping improved the electrical properties of the sample significantly.The conductivity of KNb_ 0.9 Mg_ 0.1 O_ 3- a is 1.2×10 -3 S/cm at 700℃.

关 键 词：固体电解质 KNBO3 氧离子导体 交流阻抗谱 高温高压 电解质材料 

分 类 号：O512[理学—低温物理]