沿[001]c方向极化PZN-xPT单晶的声表面波性能  

Surface Acoustic Waves Properties of PZN-xPT Single Crystals Poled along[001]c

作　　者：李秀明 吴广涛 张锐[2] LI Xiuming;WU Guangtao;ZHANG Rui(School of Mechatronics Engineering,Daqing Normal University,Daqing 163712,China;Department of Physics,Harbin Institute of Technology,Harbin 150080,China)

机构地区：[1]大庆师范学院机电工程学院,大庆163712 [2]哈尔滨工业大学物理系,哈尔滨150080

出　　处：《人工晶体学报》2020年第4期581-586,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(11547171)。

摘　　要：利用半波解法对三方相、四方相及准同型相界附近,沿[001]c方向极化(1-x)Pb(Zn1/3Nb2/3)O3-xPbTiO3晶体的声表面波传播特性进行了对比研究。结果表明,位于准同型相界附近的0.92Pb(Zn1/3Nb2/3)O3-0.08PbTiO3晶体的声表面波性能明显优于三方相0.955Pb(Zn1/3Nb2/3)O3-0.045PbTiO3和四方相0.88Pb(Zn1/3Nb2/3)O3-0.12PbTiO3晶体。具有复杂工程畴结构的0.92Pb(Zn1/3Nb2/3)O3-0.08PbTiO3晶体声表面波机电耦合系数显著高于四方相晶体。同时0.92Pb(Zn1/3Nb2/3)O3-0.08PbTiO3晶体具有相对较小的声表面波相速度和能流角。因此,该晶体适合制作机电性能优越的声表面波器件。The surface acoustic wave(SAW)properties in(1-x)Pb(Zn1/3Nb2/3)O3-xPbTiO3 single crystals poled along[001]c at rhombohedral,tetragonal and morphotropic phase boundary be compared by the Christoffel equation with semi-infinite boundary conditions.The results show that 0.92 Pb(Zn1/3Nb2/3)O3-0.08 PbTiO3 single crystal near morphotropic phase boundary has better surface acoustic wave properties than the rhombohedral 0.955 Pb(Zn1/3Nb2/3)O3-0.045 PbTiO3 and tetragonal 0.88 Pb(Zn1/3Nb2/3)O3-0.12 PbTiO3.It is very apparent that the surface acoustic wave electromechanical coupling coefficient of 0.92 Pb(Zn1/3Nb2/3)O3-0.08 PbTiO3 single crystal is dramatically higher compared to tetragonal single crystal.Also,0.92 Pb(Zn1/3Nb2/3)O3-0.08 PbTiO3 single crystal has low phase velocities and small power flow angles.Therefore,this crystal is very suitable in making SAW devices with superior electromechanical performance.

关 键 词：PZN-xPT 压电晶体 声表面波 

分 类 号：TN65[电子电信—电路与系统]