新型无铅压电陶瓷NBT-NBSN的研究  

Study of New Lead-free Piezoelectric Ceramics of (Na_(1/2)Bi_(1/2))TiO_3-(Na_(1/2)Bi_(1/2))(Sb_(1/2)Nb_(1/2))O_3

作　　者：周昌荣[1] 刘心宇[1] 

机构地区：[1]中南大学材料科学与工程学院

出　　处：《压电与声光》2008年第2期196-198,共3页Piezoelectrics & Acoustooptics

摘　　要：采用传统陶瓷制备方法，制备出一种钙钛矿结构无铅新压电陶瓷材料（1-x）（Na1/2Bi1/2）TiO3-x（Na1/2Bi1／2）（Sb1／2Nb1／2）O3（T=0～1．4％，摩尔分数）。研究了（Na1/22Bi1/2）TiO3（NBT）陶瓷B位复合离子（Sb1／2Nb1／2）^4＋取代对介电和压电性能的影响。X射线衍射分析表明，所研究的组成均能形成纯钙钛矿（ABO3）型固溶体。陶瓷材料的介电常数-温度曲线显示陶瓷在升温过程中存在两个介电常数温度峰，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。检测了不同组成陶瓷的压电性能，发现材料的压电常数d33、厚度机电耦合系数kl和介电常数εr随着x值的增加先增加后降低，在x=0．8％时，陶瓷的d33=97pC／N，kr=0．50，为所研究组成中的最大值，介电损耗tan δ则随x值的增加而增加。A new （ Na1/2 Bi1/2 ） TiO3-based lead-free piezoelectric ceramics of （ 1 - x） （Na1/2 Bi1/2） TiO3-x （Na1/2 Bi1/2） （Sb1/2 Nb1/2 ）O3 （x=0- 1.4%） were prepared by the conventional ceramic sintering technique. The effect of complex ions of （Sb1/2Nb1/2）^4- substitution in the B-site of NBT ceramics on dielectric and piezoelectric properties was investigated. X-ray diffraction patterns indicated that the ceramics studied could form pure perovskite structure. The dielectric constants as a function of temperature at different frequencies showed that these ceramics were typical relaxor ferroeleetrics. It was found that the piezoelectric constant d33, thickness electromechanical coupling factor k, and dielectric constant εr increased at first and then decreased with the increase of x value. The excellent properties of d33 = 97 pC/N and k of x value. 0.50 were obtained at x= 0.8%. The dielectric loss tan 8 increased with the increasing of x value.

关 键 词：(Na1/2Bi1/2)TiO3(NBT) 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]