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Pure mode axis and the electromechanical coupling coefficients of the 0.67Pb(Mg1/3Nb2/3) O3-0.33PbTiO3 single crystal
Ferroelectrics ( IF 0.8 ) Pub Date : 2020-05-04
Guo-xiang Zhou, Jiao Li

Pure mode axes of the 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 (PMN-0.33PT) single crystals are investigated by slowness surfaces method. It is found only the Z-axis is a pure mode axis. The piezoelectricically stiffened Christoffel equation of the PMN-0.33PT crystal is solved in the rotating coordinate system. All of the single acoustic modes of thickness vibration are obtained. For the pure longitudinal mode of Z-cut crystal, the electromechanical coupling coefficient is up to 0.82. However, it is only 0.34 for the pure shear modes of X-cut or Y-cut crystal. It is along the pure mode axis that the maximum electromechanical coupling coefficients can be achieved.



中文翻译:

O3-0.33PbTiO3单晶0.67Pb(Mg1 / 3Nb2 / 3)O3-0.33PbTiO3单晶的纯模轴和机电耦合系数

采用慢速表面法研究了0.67Pb(Mg 1/3 Nb 2/3)O 3 -0.33PbTiO 3(PMN-0.33PT)单晶轴。发现只有Z轴是纯模式轴。在旋转坐标系中求解PMN-0.33PT晶体的压电增强Christoffel方程。获得了厚度振动的所有单一声学模式。对于Z切晶体的纯纵向模式,机电耦合系数高达0.82。但是,X切割或Y切割晶体的纯剪切模式仅为0.34。沿着纯模式轴可以实现最大的机电耦合系数。

更新日期:2020-05-04
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