弛豫铁电0.24PIN-0.47PMN-0.29PT单晶声表面波性能研究

摘要/Abstract

摘要： 随着信息技术的迅速发展,对声表面波器件的要求也进一步提高。为寻找性能更加优异的声表面波器件基底材料,本文利用分波解法对室温下[001]_c及[011]_c极化弛豫铁电0.24PIN-0.47PMN-0.29PT单晶的声表面波性能进行研究。利用[001]_c及[011]_c极化弛豫铁电0.24PIN-0.47PMN-0.29PT单晶的弹性、压电及介电性能参数,通过求解克里斯托弗方程计算了晶体声表面波相速度、机电耦合系数及能流角随传播角度的变换关系。结果表明,沿[011]_c方向极化的0.24PIN-0.47PMN-0.29PT单晶声表面波性能要优于沿[001]_c极化的单晶。[011]_c极化0.24PIN-0.47PMN-0.29PT单晶的声表面波机电耦合系数显著高于沿[001]_c极化单晶。同时沿[011]_c极化0.24PIN-0.47PMN-0.29PT单晶的声表面波能流角的最大值也明显小于[001]_c极化单晶。因此,沿[011]_c方向极化的0.24PIN-0.47PMN-0.29PT单晶兼具优异的声表面波性能及温度稳定性,更适合于实际应用。

关键词: 弛豫铁电单晶, 0.24PIN-0.47PMN-0.29PT, 声表面波, 相速度, 机电耦合系数, 能流角

Abstract: With the rapid development of the information technology, the requirements for surface acoustic wave devices are also increased. In order to find substrate materials with excellent surface acoustic wave performances, a detail theoretical analysis was conducted on the surface acoustic wave properties in 0.24PIN-0.47PMN-0.29PT single crystals along [001]_c and [011]_c at room temperature using the partial wave method. The relaxor ferroelectric single crystals xPb(In_1/2Nb_1/2)O₃-yPb(Mg_1/3Nb_2/3)O₃-(1-x-y)PbTiO₃ with compositions near the morphotropic phase boundary have comparably large piezoelectric and electromechanical properties and much higher Curie temperature. From the complete sets of elastic, piezoelectric and dielectric properties of [001]_c and [011]_c poled 0.24PIN-0.47PMN-0.29PT single crystals, the orientational dependence of surface acoustic wave phase velocities, electromechanical coupling coefficients and power flow angles was calculated by the Christoffel equation with semi-infinite boundary conditions. The results indicate that 0.24PIN-0.47PMN-0.29PT single crystals along [011]_c has better surface acoustic wave properties than the 0.24PIN-0.47PMN-0.29PT single crystals along [001]_c. It is very apparent that the surface acoustic wave electromechanical coupling coefficient for 0.24PIN-0.47PMN-0.29PT single crystal along [011]_c is dramatically higher compared to along [001]_c single crystal. Also, maximum power flow angle for 0.24PIN-0.47PMN-0.29PT single crystals along [011]_c is apparently bigger than 0.24PIN-0.47PMN-0.29PT single crystals along [001]_c. Therefore, the 0.24PIN-0.47PMN-0.29PT single crystal along [011]_c with excellent surface acoustic wave properties and temperature stability is very suitable in making surface acoustic wave devices.

Key words: relaxor ferroelectric single crystal, 0.24PIN-0.47PMN-0.29PT, surface acoustic wave, phase velocity, electromechanical coupling coefficient, power flow angle

中图分类号:

TN65

李秀明, 吴广涛, 张锐. 弛豫铁电0.24PIN-0.47PMN-0.29PT单晶声表面波性能研究[J]. 人工晶体学报, 2021, 50(2): 260-265.

LI Xiuming, WU Guangtao, ZHANG Rui. Surface Acoustic Waves Properties of 0.24PIN-0.47PMN-0.29PT Relaxor Ferroelectric Single Crystals[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(2): 260-265.

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