(Ba，Sr)TiO3半导化陶瓷PTC效应的改善  

Improvement in PTC Effect of(Ba,Sr)TiO_3 Semiconducting Ceramics

作　　者：李小燕[1] 曲远方[1] 高晶 

机构地区：[1]天津大学先进陶瓷与加工技术教育部重点实验室,天津300072 [2]领先大都克(天津)电触头制造有限公司,天津300111

出　　处：《压电与声光》2009年第5期715-717,共3页Piezoelectrics & Acoustooptics

基　　金：中国博士点基金资助项目(20050056055)

摘　　要：烧结温度、受主掺杂以及液相添加剂都会改变(Ba,Sr)TiO3陶瓷的PTC效应。结合微观结构变化和理论研究进展,讨论了这3种因素对PTC效应的影响。结果表明,低的烧结温度不利于低的室温电阻率和高的升阻比。高的烧结温度有利于获得高升阻比。MnO2含量的增加和BN的添加,分别从提高有效受主态密度和改善微观结构两方面改善了PTC效应。x(MnO2)由0.04%增加到0.05%,同时x(BN)=2%,在保持室温电阻率几乎不变的情况下,升阻比提高了2.5个数量级,阻温系数从4.0/10-2.℃-1增加到13.8/10-2.℃-1。The PTC effect of （Ba,Sr）TiO3 ceramics was modified by the sintering temperature, acceptor doping and liquid-phase additives. The influence of these three factors on the PTC effect was discussed combining with the microstructural changes and the theoretical studies. The results showed that the lower sintering temperature was not desirable for the tow room-temperature resistivity and high resistance jump, whereas high sintering temperature is favorable for good resistance jump. With the increase in MnO2 content and the addition of BN, PTC effect is enhanceddue to the high effective acceptor-state density and the improved microstructure, respectively. Under the condition of the room-temperature resistivity almost remaining the same, the resistance jump was increased by 2.5 orders of magnitute and the resistivity-temperature coefficient was increased from 4.0/10^-2 ·℃^-1 to 13.8/10^-2℃^-1 after MnO2 content increases from 0.04% to 0.05% and 2% BN was introduced.

关 键 词：(Ba  Sr)TiO3陶瓷 PTC效应 微观结构 

分 类 号：TN304[电子电信—物理电子学] TQ174[化学工程—陶瓷工业]