BaPbO_3与BaTiO_3多晶态陶瓷缺陷结构对比  

Comparative Study on Defect Structure of BaPbO_3 and BaTiO_3 Polycrystalline Ceramics

作　　者：陆裕东[1,2] 王歆[1] 庄志强[1] 刘勇[1] 

机构地区：[1]华南理工大学材料学院,特种功能材料教育部重点实验室,广州510640 [2]信息产业部电子第五研究所,电子元器件可靠性物理及其应用技术国家重点实验室

出　　处：《无机化学学报》2007年第7期1234-1237,共4页Chinese Journal of Inorganic Chemistry

基　　金：广东省自然科学基金资助项目(No.033177)

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：BAPBO3 BATIO3 缺陷化学 平衡电导率 

分 类 号：O743.1[理学—晶体学] O77