溶胶-凝胶法制备Bi_(0.5)Na_(0.5)TiO_3陶瓷及其电学特性  

Electrical properties of (Bi_(0.5)Na_(0.5))TiO_3 ceramic prepared by sol-gel method

作　　者：赵明磊[1] 王春雷[1] 钟维烈[1] 王矜奉[1] 陈洪存[1] 

机构地区：[1]山东大学物理系,山东大学晶体材料国家重点实验室,济南250100

出　　处：《物理学报》2003年第1期229-232,共4页Acta Physica Sinica

基　　金：国家重点基础研究发展规划项目 (批准号 :G19980 614 0 8)资助的课题~~

摘　　要：用溶胶 凝胶工艺成功制备出Bi0 5Na0 5TiO3纳米微粉 ,并利用此微粉烧结出高致密度的Bi0 5Na0 5TiO3陶瓷 .这种新工艺制备的Bi0 5Na0 5TiO3陶瓷 ,其压电性能远远高于普通方法制备的陶瓷 ,其中压电常数d33和机电耦合系数kt 分别高达 10 2× 10 - 1 2 C N和 5 8% .同时发现 ,对于这种Bi0 5Na0 5TiO3陶瓷 ,室温时只需施加 10 0kV cm左右的交变电场 ,就可得到矩形度极好的饱和回线 ,得到的剩余极化Pr 和矫顽场Ec 分别为 32 μC cm2 和 6 1kV cm .而在 10 0℃以上只需施加 35kV cm的极化电场就可使样品充分极化 .Bismuth sodium titanate Bi0.5Na0.5TiO3 ceramic With about 96% of,theoretical density was prepared by sol-gel processing. The saturate P-E hysteresis loop can be obtained under a 100kV/cm AC electric field for the sol-gel processed Bi0.5.,Na0.5,TiO3 Ceramic and the remanent polarization P-r and coercive field E-c are 32muC/cm(2) and 61kV/cm, respectively. Moreover, from the piezoelectric. measurements, this material fabricated by sol-gel processing was found to have increased piezoelectric constant d(33)=102 x 10(-12)C/N and electromechanical coupling factor k(t), = 58%. Therefore, sol-gel method is. a potential fabrication, technique for this lead-free piezoelectric ceramic.

关 键 词：Bi0.5Na0.5TiO3陶瓷 电学特性 溶胶-凝胶 纳米微粉 剩余极化 压电常数 机电耦合系数 压电陶瓷 钛酸铋钠 

分 类 号：TQ174.6[化学工程—陶瓷工业]