摘要
本工作制备了添有少量Pb(Zn_(1/3) Nb_(2/3))O_3,Bi(Zn_(1/2) Ti_(1/2))O_3和MnO_2的高电阻率,高密度的改性(PbCa)TiO_3压电陶瓷。这种陶瓷在150℃和施加40—50kV/cm电场条件下极化之后显示出大的各向异性压电特性。它具有高的厚度扩张模式机电藕合系数Kt,高的机械品质因素Qm低的介电常数,而平面耦合系数Kp值极小。于是,这种新的压电材料适于制作高频陶瓷滤波器超声换能器,金属探伤检测器,以及声表面波器件等。
The modified (Pb,Ca)TiO3 piezoelectric ceramics added with a small amount of Pb (Zn1/3Nb2/3) 0;, Bi(Zn1/2T1/2)O3 and MnO2 were prepared, which has high electrical resistivity and density .After polarized under the electric field of about 40-50 kV/cm at 150C, these ceramics exhibits large anisotropic piezoelectric constants. The modified ceramics have high electromechanical thickness coupling factor kt, high mechanical .quality factor as well as low dielectric constant, while planar coupling factor ftp decreases to a negligibly small value. This new piezoelectric material suitable for high frequency ceramic filters, ultrasonic transducers, metal flaw detectors and SAW de-
出处
《压电与声光》
CSCD
北大核心
1991年第2期29-34,共6页
Piezoelectrics & Acoustooptics
关键词
压电陶瓷材料
各向异性
压电效应
modified PbTiO3 ceramics, anisotropic piezoelectric effect, crystal ordered material characteristics
