新型无铅压电陶瓷BNKT-BiFeO_3的研究  

Study on New Lead-free Piezoelectric Ceramics of BNKT-BiFeO_3

作　　者：杨桂华[1] 周昌荣[2] 

机构地区：[1]桂林理工大学电子与计算机系,广西桂林541004 [2]桂林电子科技大学材料科学与工程学院,广西桂林541004

出　　处：《压电与声光》2009年第6期865-867,共3页Piezoelectrics & Acoustooptics

基　　金：广西信息材料重点实验室主任基金资助项目(0710908-02-Z)

摘　　要：采用传统陶瓷制备法制备了一种新型无铅压电陶瓷(1-x)Bi0.5(Na0.82 K0.18)0.5TiO3-xBiFeO3(BNKT-BFx)。研究了Bi基铁电体BiFeO3对BNKT-BFx陶瓷晶体结构、显微组织和压电性能的影响。结果表明,在所研究的组成范围内陶瓷材料均能形成纯钙钛矿固溶体,陶瓷的准同型相界位于x=0～0.05。BiFeO3促进陶瓷致密化和晶粒生长,在准同型相界成分附近压电性能达到最大值:d33=171pC/N,kp=0.366。A new （Bi0.5Na0.5）TiO3-based lead-free piezoelectric ceramics,（1-x）Bi0.5（Na0.82K0.18）0.5TiO3-xBiFeO3 （BNKT-BFx）,was prepared by the conventional ceramic sintering technique. The effect of Bi-based ferroelectrics of BiFeO3 on the crystal structure,microstructure and piezoelectric properties was investigated. X-ray diffraction patterns indicated that the ceramics studied can form pure perovskite structure. The morphotropic phase boundary （MPB） of the system between the rhombohedral and tetragonal located in the range of x=0-0.05. The density and grain size were increased by BiFeO3 addition. The piezoelectric constant d33 and the electromechanical coupling factor kp of the ceramics attain maximum values of 171 pC/N and 0.366 respectively at x=0.03.

关 键 词：钛酸铋钠 无铅压电陶瓷 压电性能 钙钛矿结构 准同型相界 

分 类 号：TN304[电子电信—物理电子学] TM282[一般工业技术—材料科学与工程]