无铅压电陶瓷BNKT-BiGaO_3的研究  

Development of BNKT-BiGaO_3 Lead-free Ceramics

作　　者：周沁[1] 元德侃[1] 周昌荣[1,2] 杨华斌[1] 袁昌来[1] 

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西桂林541004 [2]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《压电与声光》2010年第3期423-425,共3页Piezoelectrics & Acoustooptics

基　　金：中国博士后科学基金资助项目(20090461018);2009年国家级大学生创新性实验基金资助项目(ZCC0123);广西自然科学基金重点资助项目(2010GXNSFD013007);广西自然科学基金资助项目(2010GXNSFB013010)

摘　　要：采用传统陶瓷制备方法制备了一种新型无铅压电陶瓷(1-x)Bi0.5(Na0.82K0.18)0.5TiO3-xBiGaO3(BNKT-BGx),研究了Bi基铁电体BiGaO3对BNKT陶瓷微观结构和压电介电性能的影响。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,陶瓷晶粒尺寸随x的增加而增加。压电性能随x的增加先增加后减少,在x=0.01时压电常数及机电耦合系数达到最大值(d33=165 pC/N,kp=0.34)。介电温谱显示该陶瓷具有2个介电反常峰,介电常数在低温反常峰附近具有明显的频率依赖性。A new（Bi0.5Na0.5）TiO3-based lead-free piezoelectric ceramics（1-x）Bi0.5（Na0.82K0.18）0.5TiO3-xBiGaO3（BNKT-BGx） was prepared by the conventional ceramic sintering technique.The effect of Bi-based ferroelectrics BiGaO3 on the microstructure,dielectric and piezoelectric properties of BNKT piezoelectric ceramic was investigated.The results of X-ray diffraction reveal that BiGaO3 diffuse into the Bi0.5Na0.5TiO3 lattices to form a new solid solution with a pure perovskite structure.An obvious change in microstructure with increasing concentration of BiGaO3 is observed.The piezoelectric constant d33 and the electromechanical coupling factor kp of the ceramics attain maximum values of 165 pC/N and 0.34 at x=0.01.The temperature dependence of dielectric constant indicates that an obvious relaxor characteristic with strong frequency dependence of dielectric constant has been appeared.

关 键 词：钛酸铋钠 无铅压电陶瓷 压电性能 钙钛矿结构 

分 类 号：TN804[电子电信—信息与通信工程] TM282[一般工业技术—材料科学与工程]