低温烧结SrBi_4Ti_4O_(15)/Ag复合材料的制备及其介电特性  

Preparation of SrBi4Ti4O15/Ag Composites Sintered at Low Temperature and Their Dielectric Properties

作　　者：黄平[1] 徐廷献[1] 

机构地区：[1]天津大学,天津300072

出　　处：《稀有金属材料与工程》2005年第7期1154-1157,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金重大资助项目(59995520);Nippon Sheet Glass Foundation for Materials Science and Engineering(Japan)资助项目(301-05544)

摘　　要：采用固相烧结工艺制备了SrBi4Ti4O15(SBTi)/Ag铁电复合材料,通过X射线衍射、光学金相显微镜和扫描电子显微镜对材料的组成和微观结构进行了研究,并测量样品的介电温度谱。结果表明:复合材料是由SBTi和Ag两相组成。微量金属Ag的加入使SBTi铁电陶瓷的烧结温度从1120℃降低到950℃以下;可以适当提高铁电陶瓷从室温到200℃的介电常数,但对材料的介电损耗影响很小。同时Ag的加入压抑了介电温度曲线上的介电常数的Curie峰。Strontium bismuth titanate (SBTi) matrix composites containing Ag particles were synthesized by the conventional solid-state reaction method. The SBTi/Ag composites were characterized by a variety of techniques: x-ray diffraction, optical metallurgical microscope, scanning electron microscope and dielectric measurements. It is found that Ag doping has significant effect on the physical properties of the composites. With the addition of Ag particles to the SBTi matrix, the single-phase layered perovskite structure of the matrix is preserved and the sintering temperature of the system is lowered from 1 120 degrees C for monolithic SBTi to 950 degrees C. The SBTi/Ag composites show a significant change of the dielectric constant. With increasing Ag content, a gradual increase of the dielectric constant is observed and the dielectric losses of SBTi/Ag composites remain unchanged when the temperature is in the range from the room temperature to 200 degrees C, however, the Curie peak of dielectric constant is repressed. The results show that the SBTi/Ag composites improve the dielectric properties and the processing condition.

关 键 词：铁电陶瓷 SRBI4TI4O15 银 复合材料 

分 类 号：TB333[一般工业技术—材料科学与工程]