Influence of microstructure on the ionic conductivity of yttria-stabilized zirconia electrolyte
Influence of microstructure on the ionic conductivity of yttria-stabilized zirconia electrolyte
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DOI：
10.1016/s0921-5093(01)01935-9
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发表时间：
2002-09-25
期刊：
影响因子：
6.4
通讯作者：
Yu, LG
中科院分区：
文献类型：
--
作者：
Chen, XJ;Khor, KA;Yu, LG
以纳米级(Y_2O_3)(0.08)(ZrO_2)(0.92)粉末为前驱体，采用常规空气烧结法制备了不同微观结构的YSZ电解液。用交流阻抗谱测试了电解液的晶内和晶间电导率对总离子电导率的贡献。晶内电导率和晶间电导率与电解液的微观结构相关联，解释了氧离子在电解液中的传输。晶内电导率主要由相对密度决定，而晶间电导率则强烈依赖于电解液的晶粒度和晶界面积。当烧结温度为1350℃，保温时间为8h时，离子电导率与烧结温度和时间的关系分别达到最大值0.105 S/cm和0.112 S/cm。综述了提高YSZ电解液离子导电性的概念。(C)2002年，爱思唯尔科学公司出版。
Yttria-stabilized zirconia (YSZ) electrolytes with diverse microstructures were prepared by using nano-size (Y2O3)(0.08)(ZrO2)(0.92) powders as precursors through conventional sintering in air. The electrolytes were tested by AC impedance spectroscopy to elucidate the contribution of intragranular and intergranular conductivity to the total ionic conductivity. The intragranular conductivity and intergranular conductivity were correlated with the microstructures of the electrolyte to interpret the transportation of oxygen ions through the electrolyte. The intragranular conductivity was found to be dominated mainly by the relative density while the intergranular conductivity strongly depended on the grain size and grain boundary area of the electrolyte. The sintering temperature and isothermal time dependence of ionic conductivity reached a maximum value of 0.105 S/cm at a sintering temperature of 1350 degreesC for 4 h and 0.112 S/cm at a holding time of 8 h at 1250 degreesC when measured at 1000 degreesC, respectively. Concepts for improving the ionic conductivity of YSZ electrolyte were reviewed. (C) 2002 Published by Elsevier Science B.V.