Chuanwen Chen, Lei Qin, Maoxin Su, Yang Xiang, Liguo Tang, Kainan Xiong, Kechen Wu, Xiaoniu Tu, Wenyu Luo
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引用次数: 0
Abstract
In this study, the propagation of plane waves in the lanthanum gallium tantalate (langatate, LGT) single crystals is investigated. Moreover, the flight time of different waves in the LGT rectangular parallelepiped sample is measured using the ultrasonic pulse‐echo (UPE) technique, and the elastic constants of the LGT sample are determined. The experimental results clearly show echoes corresponding to the longitudinal and transverse waves along the x‐axis. The waves along the z‐axis have a similar property. However, the waves along the y‐axis are more complex than those along the x‐ and z‐axes. The echoes corresponding to the quasi‐longitudinal waves along the y‐axis are clear, but those corresponding to the transverse and quasi‐transverse waves along the y‐axis are not. The elastic constant can be accurately determined if the wave echoes corresponding to this constant propagate without distinct distortion and are clear; otherwise, it may be impossible to accurately determine the constant using UPE. All elastic constants except of the LGT single crystals can be determined using UPE from one sample. This study uses UPE to provide a reference for the characterization of elastic constants of piezoelectric crystals with 32 symmetry from one sample.
本研究探讨了平面波在钽酸镧(Langatate,LGT)单晶体中的传播。此外,还利用超声脉冲回波(UPE)技术测量了不同波在 LGT 矩形平行四边形样品中的飞行时间,并确定了 LGT 样品的弹性常数。实验结果清楚地显示了与沿 x 轴的纵波和横波相对应的回波。沿 Z 轴的波具有类似的特性。然而,沿 y 轴的波比沿 x 轴和 z 轴的波更为复杂。与沿 y 轴的准纵波相对应的回波是清晰的,但与沿 y 轴的横波和准横波相对应的回波却不清晰。如果与弹性常数相对应的波的回波传播没有明显的畸变且清晰,则可以准确地确定弹性常数;否则,可能无法使用 UPE 准确地确定弹性常数。除 LGT 单晶体外,其他所有弹性常数均可通过一个样品使用 UPE 测定。本研究使用 UPE 为从一个样品测定具有 32 个对称性的压电晶体的弹性常数提供了参考。
期刊介绍:
The journal Crystal Research and Technology is a pure online Journal (since 2012).
Crystal Research and Technology is an international journal examining all aspects of research within experimental, industrial, and theoretical crystallography. The journal covers the relevant aspects of
-crystal growth techniques and phenomena (including bulk growth, thin films)
-modern crystalline materials (e.g. smart materials, nanocrystals, quasicrystals, liquid crystals)
-industrial crystallisation
-application of crystals in materials science, electronics, data storage, and optics
-experimental, simulation and theoretical studies of the structural properties of crystals
-crystallographic computing