LSCM/3YSZ离子-电子混合导体的研究  

The research of LSCM/3YSZ mixed ionic-electronic conductor

作　　者：简家文[1] 邹杰[1] 高建元[1] 吴翔[1] 周贞[1] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《功能材料》2011年第5期816-819,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(60971074);浙江省自然科学基金资助项目(Y1080430)

摘　　要：采用固相法制备了LSCM(La0.75Sr0.25Cr0.5Mn0.5O3)粉体,并以不同质量比与3YSZ((Y2O3)0.03(ZrO2)0.97)混合制成了LSCM/3YSZ离子-电子混合导体(MIEC)。采用X射线衍射、扫描电镜、热膨胀分析等手段对该混合导体的各项物理特性进行了研究,发现随着LSCM含量的逐渐增多,混合导体中Zr与Sr、Cr等元素的反应有少量杂相生成;LSCM相也逐步形成相连的空间网络结构;LSCM含量在0～40%范围的混合导体其热膨胀系数在0～1350℃测试温度范围内有一个明显的拐点。使用Wagner直流极化法分离了混合导体的离子电导率和电子电导率。当LSCM质量百分比达到40%时,离子电导率以及总电导率开始大幅度地增大;当LSCM含量为50%测试温度800℃时样品的总电导率和离子电导率分别为0.24和0.08S/cm。A series of ionic-electronic conductors were made by compound different quality of LSCM（La0.75Sr0.25Cr0.5Mn0.5O3） and 3YSZ.The physics characteristics of MIECs were tested by X-ray diffraction,SEM and thermal expansion analysis etc.The LSCM forms a connected space network and there are impurity phases as a result of the reaction between Zr and Sr or Cr,with the increase of LSCM content.When the percentage content of LSCM is 0-40%,each thermal expansion curves have a clear inflexion in the temperature range from 0-1350℃.The conductivities of ion and electron are tested by wagner DC polarization method.When the LSCM percentage content reach 40%,the ionic and total conductivities are increased quickly,when the LSCM percentage content is 50% and the test temperature is 800℃,the total and ionic conductivities are 0.24 and 0.08S/cm,respectively.

关 键 词：离子-电子混合导体 Wagner直流极化法 空间网络 

分 类 号：TB34[一般工业技术—材料科学与工程] TB321