基于离子阻挡法测量电子-离子混合导体中离子电导率的研究（英文）  

Measuring Ionic Conductivity in Mixed Electron-ionic Conductors Based on the Ion-blocking Method

作　　者：刘勇英 仇鹏飞[1] 陈弘毅[1,2] 陈瑞 史迅 陈立东[1] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050 [2]中国科学院大学,北京100864

出　　处：《无机材料学报》2017年第12期1337-1344,共8页Journal of Inorganic Materials

基　　金：National Science Fund for Distinguished Young Scholars(51625205);National Natural Science Foundation of China 51402337,51472262)

摘　　要：近年来,具有诸多新的物理性质和优良热电性能的类液态材料获得了研究人员的广泛关注。离子电导率对理解这类热电材料中的离子迁移行为非常关键。但是,由于类液态热电材料中的离子电导率在总电导率中的贡献很小,因此很难利用传统方法精确测量其离子电导率。本研究基于Yokota提出的离子阻挡法,尝试利用自主搭建的设备测量类液态热电材料的离子电导率。本文详细介绍了该设备的基本构造、测试原理以及测试步骤,分析了帕尔贴效应/塞贝克效应、离子析出、电压测试点的位置和氧化挥发等因素对测试准确性的影响,并提出了相应的解决方案,成功测量了几种具有代表性的类液态热电材料的离子电导率。Ionic conductivity is common in liquid-like thermoelectric （TE） materials and it helps to understand the abnormal electrical and thermal transports. However, in experiment, accurately measuring the ionic conductivities in liquid-like TE materials is very difficult because of the very small contribution from ions to the total conductivity. In this study, based on the ion-blocking method proposed by Yokota, a home-made instrument has been built to accurately measure the ionic conductivity of liquid-like TE materials. The basic construction of this instrument and the measurement principles are introduced. The related factors that might influence the measurement accuracy are also analysed. Finally, the ionic conductivities for two typical liquid-like TE materials are presented to show the va- lidity of our home-made instrument.

关 键 词：热电材料 离子电导率 离子阻挡法 离子激活能 

分 类 号：TQ174[化学工程—陶瓷工业]