作　　者： ; ; ; ;

机构地区： 华南理工大学材料科学与工程学院特种功能材料教育部重点实验室

出　　处： 《无机化学学报》 2007年第7期1234-1237,共4页

摘　　要： BaPbO，是具有类金属导电特性的钙钛矿结构导电陶瓷，其晶体结构由Ba2＋和O^2-离子紧密堆积形成，pb^4＋离子占据由O^2-离子形成的八面体空隙。BaTiO3同为钙钛矿结构的陶瓷材料，由Ba^2＋和O^2-离子紧密堆积形成，Ti^4＋离子占据由O^2-离子形成的八面体空隙。BaPbO3和BaTiO3的A位离子相同,B位离子都为可变价离子。 Based on the results of defect chemistry, a comparative study of the defect structure between BaTiO3 and BaPbO3 was performed. Both BaTiO3 and BaPbO3 are perovskite crystal, while they are considerable different in electrical properties because of the difference of the defect structure. The difference of the electrical properties was discussed in detail from the point of view of the defect structure. Electrons and holes have never been the major defects in BaPbO3 and BaTiO3, respectively. The holes are not the major defects in BaTiO3 until the oxygen activity is low enough. Both of BaPbO3 and BaTiO3 show intrinsic disorder in highly oxygen activity and low oxygen activity, respectively. Oxygen vacancies are the major defects in BaTiO3 all along, while they become the major defects only in the low oxygen activity of BaPbO3.

关 键 词： 缺陷化学 平衡电导率

领　　域： [理学] [理学]