一次烧成SrTiO_3复合功能陶瓷中掺杂Ag^+离子的行为及其机制  

Behavior and its mechanism for doped Ag^+ ion in single-sintered SrTiO_3 multifunction ceramics

作　　者：徐庆[1] 陈文[1] 袁润章[1] 

机构地区：[1]武汉工业大学材料复合新技术国家重点实验室

出　　处：《功能材料》2001年第3期312-314,共3页Journal of Functional Materials

基　　金：武汉工业大学材料复合新技术国家重点实验室开放基金资助项目

摘　　要：采用一次烧成工艺制备掺施主杂质 Ｎｂ２Ｏ５和受主杂质Ａｇ２Ｏ的ＳｒＴｉＯ３电容－压敏复合功能陶瓷．分析了 Ａｇ２Ｏ掺杂对 ＳｒＴｉＯ３陶瓷电学性能的影响，采用 ＸＰＳ和 ＥＰＭＡ分析方法确定了 Ａｇ的结构状态。研究结果表明，Ａｇ＋离子存在于烧结助剂形成的晶界非晶相中，对ＳｒＴｉＯ３ 晶粒的半导化状况未产生显著影响。氧化热处理过程中Ａｇ＋离子低价取代晶粒表面的Ｓｒ２＋离子而形成晶界受主态，是产生晶界Ｓｃｈｏｔｔｋｙ势垒及复合功能效应的重要原因。SrTiO3 multifunction ceramics with Nb2O5 and Ag2O doped as donor dopant and acceptor dopant respectively is fabricated by a single-sintering process. The influence of doped Ag2O on the electrical properties of SrTiO3 ceramics are analyzed, while the structural condition of Ag is ascertained by XPS and EPMA. The results show that Ag+ ion distribute in grain-boundary amorphous phase originating from the melting of the sintering aids at high temperature, for which no remarkable influence on semi-conducting condition is observed in response to the doped Ag+ ion. The formation of grain-boundary acceptor state, due to the substitution of Sr2+ ion on grain surface by the diffused Ag+ ion during the oxidizing annealing, plays an important role in the generation of Schottky barrier and resultant multifunction effect.

关 键 词：复合功能陶瓷 一次烧成 掺杂 钛酸锶 银离子 

分 类 号：TQ174.758[化学工程—陶瓷工业]