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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Dielectric, Elastic and Piezoelectric Constants of Lanthanum Calcium Oxoborate Single Crystals with Monoclinic Structure of Point Group m
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Dielectric, Elastic and Piezoelectric Constants of Lanthanum Calcium Oxoborate Single Crystals with Monoclinic Structure of Point Group m

机译：点群为m的单斜晶系结构的硼酸镧钙单晶体的介电​​，弹性和压电常数

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摘要

In this study, we propose using the d33 mode of a d33/d31 meter, new cuts and vibration modes to evaluate electroacoustical constants (dielectric, elastic and piezoelectric constants) of a piezoelectric crystal belonging to point group m. All material constants at room temperature of lanthanum calcium oxoborate LaCa_4O(BO_3)_3 single crystals were thereby determined. The piezoelectric constants d_(11) and d_(33) measured by the d33 meter were 2.1 and 1.5 pC/N, respectively. The others were determined by the resonance-antiresonance method using various cuts in which the length-extensional mode and/or face-shear mode can be generated. The elastic compliances s_(44)~E, s_(55)~E and s_(66)~E were 35 x 10~(-12), 18 x 10~(-12) and 18 x 10~(-12) m~2/N, respectively. Moreover, in order to investigate the dependence of the Rayleigh surface acoustic wave (RSAW) velocity and coupling coefficient k~2 on propagation direction, theoretical analysis by computer simulations was carried out for the Z-cut using the elastic compliances obtained in this study. The dependence of RSAW velocity on propagation direction calculated using the elastic compliances obtained did not agree with measurement results, but the calculated results were significantly improved and closer to measurement results.
机译：在这项研究中，我们建议使用d33 / d31表的d33模式，新的切割和振动模式来评估属于点组m的压电晶体的电声常数（介电常数，弹性常数和压电常数）。从而确定了氧硼酸镧钙LaCa_4O（BO_3）_3单晶在室温下的所有材料常数。用d33测量仪测得的压电常数d_（11）和d_（33）分别为2.1和1.5pC / N。其他的通过使用各种切口的共振-反共振方法来确定，其中可以产生长度-延伸模式和/或面部剪切模式。弹性柔度s_（44）〜E，s_（55）〜E和s_（66）〜E为35 x 10〜（-12），18 x 10〜（-12）和18 x 10〜（-12） m〜2 / N。此外，为了研究瑞利表面声波（RSAW）速度和耦合系数k〜2对传播方向的依赖性，使用本研究获得的弹性柔度对Z形切口进行了计算机仿真理论分析。使用获得的弹性柔量计算的RSAW速度对传播方向的依赖性与测量结果不一致，但是计算结果得到了显着改善，并且更接近于测量结果。

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