B位复合离子取代BNT无铅陶瓷的压电介电性能  

Effect of B-site Complex Ions Substitution on Dielectric and Piezoelectric Properties of BNT Lead-free Piezoelectric Ceramics

作　　者：单召辉[1] 刘心宇[1] 杨桂华[2] 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,桂林541004 [2]桂林工学院电子与计算机系,桂林541004

出　　处：《人工晶体学报》2008年第5期1152-1156,共5页Journal of Synthetic Crystals

基　　金：广西自然科学基金(No.0447092)

摘　　要：采用两步合成工艺,制备了新型B i1/2Na1/2Ti1-x(Mg1/3Nb2/3)xO3系无铅压电陶瓷。研究了B位复合离子取代对BNT陶瓷的晶体结构及压电与介电性能的影响。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;当x=0.015时,该体系陶瓷具有较佳的压电性能:压电常数d33=101 pC/N;kt=0.48。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弥散相变特征。该体系陶瓷具有高kt值,低kp值;其比值kt/kp较大,具有较大的各向异性,是一种适合高频下使用的优良的超声换能材料。A new lead-free piezoelectric ceramics of Bi1/2 Na1/2Ti1-x Mg1/3 Nb2/3 ）xO3 was prepared by the two-step synthesize method and the effect of B-site the complex ions substitution on the piezoelectric and dielectric properties was investigated. X-ray diffraction patterns indicate that the ceramics studied can form pure perovskite structure. The favorable piezoelectric properties of d33 = 101 pC/N , kt =0.48 were obtained at x =0. 015. The curves of the dielectric constants as a function of temperature show obvious relaxor characteristic. The results showed that Bil/2 Na1/2 Ti1-x （Mg1/3 Nb2/3 ）xO3 ceramics were good candidate for use as ultrasonic transducer ceramics because their kt/kp value is high.

关 键 词：钛酸铋钠 复合离子 压电介电性能 弥散相变 

分 类 号：TM282[一般工业技术—材料科学与工程]