NBT-Ba(NbO3)2无铅压电陶瓷的压电介电性能  

Piezoelectric and Dielectric Properties of Lead-free Piezoelectric Ceramics in NBT-Ba(NbO_3)_2 Binary System

作　　者：孟希敏[1] 刘心宇[1] 周昌荣[1] 

机构地区：[1]桂林电子科技大学信息材料科学与工程系,广西桂林541004

出　　处：《压电与声光》2008年第1期75-77,81,共4页Piezoelectrics & Acoustooptics

摘　　要：采用传统陶瓷制备方法，制备了一种新的（Na1／2Bi1／2）TiO3基无铅压电陶瓷（1-x）（Na1/2Bi1／2）TiO3-xBa（NbO3）2（摩尔分数x=0～1．4％）。X-射线衍射分析表明，所研究的组成均能够形成纯钙钛矿（ABO3）型固溶体。SEM观察结果表明，掺入Ba（NbO3）2促进了长条状晶粒的析出。不同频率下陶瓷材料的介电常数-温度曲线显示该体系材料具有明显的弛豫铁电体特征，且随着Ba（NbO3）x的增加，其弛豫性特征愈明显。检测了不同组成陶瓷的压电性能，发现材料的压电常数d33和平面机电耦合系数女。随着x值的增加先增加后降低，在x=0．6％时，陶瓷的d33=94pC／N，kp=0．171，为所研究组成中的最大值，介电损耗tanδ则随x值的增加而增加。A new （Na1/2Bi1/2 ）TiO3-based lead-free piezoelectric ceramics of （1- x）（ Na1/2 Bi1/2 ）TiO3-xBa （NbO3）2 （x=0-1.4%） were prepared by the conventional ceramic sintering technique. X-ray diffraction patterns indicate that the ceramics studied can form pure perovskite structure and SEM observation indicate that doping with a moderate amount of Ba（NbO3）2 can promote the precipitation of stick grains. The dielectric constants as a function of temperature at different frequencies show obvious relaxor characteristic. The relaxor characteristic becomes more obvious with the increasing of the content of Ba（NbO3 ）2. It is found that the piezoelectric constant d33 and planar electromechanical coupling factor kp increase first and then decrease with the increase of x value. The favourable properties of d33 and kp are 94 pC/N and 0. 171 were obtained when the Ba（NbO3）2 content was 0. 6%. The dielectric loss tan 3 increase with the increasing of x value.

关 键 词：(Na1/2Bi1/2)TiO3 Ba(NbO3)2 无铅压电陶瓷 压电介电性能 

分 类 号：TM282[一般工业技术—材料科学与工程]