Relationship between lattice mismatch and ionic conduction of grain boundary in YSZ

作     者：Fei Ye Chunyu Yin Dingrong Ou Toshiyuki Mori 

作者机构：School of Materials Science and EngineeringDalian University of Technology Key Laboratory of Materials Modification by LaserIon and Electron BeamsDalian University of TechnologyMinistry of Education Laboratory of Fuel CellsDalian Institute of Chemical PhysicsChinese Academy of Sciences Fuel Cell Materials GroupBattery Materials UnitNational Institute for Materials Science 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2014年第24卷第1期

页      面：83-86页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：support from Global Research Center for Environment Energy based on Nanomaterials Science (GREEN) the National Natural Science Foundation of China (No. 51101146) supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Ministry of Education the Fundamental Research Funds for the Central Universities (No. DUT13LAB20) 

主　　题：Yttria-stabilized zirconia Grain boundary Ionic conduction Mismatch 

摘      要：The grain boundary plays an important role in the electrical behaviors of solid oxide electrolytes for solid state fuel cells. To reveal the relationship between the structure and the ionic conductivity of grain boundary,the conductive properties of {1 1 1} and {1 1 0} twist grain boundaries in 8 mol% yttria-stabilized zirconia have been examined. These boundaries have a series of Σ values defined by the coincident site lattice model. It has been found that the activation energy of {1 1 1} twist grain boundary increases and then decreases with the Σ value,while that of the {1 1 0} boundary shows an opposite trend. It is suggested that the properties can reflect the balance of the effects of lattice mismatch on the diffusion ability of oxygen vacancies and the segregation of oxygen vacancies and Y3 tions. Therefore,the properties in polycrystalline electrolyte can be adjusted by controlling the grain boundary structures.