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Precise Determination of Acoustical Physical Constants of LiNbO_3 and LiTaO_3 Single Crystals

LiNbO_3和LiTaO_3单晶声学物理常数的精确测定

基本信息

批准号：
07455127
负责人：
KUSHIBIKI Jun-ichi
金额：
$ 4.74万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455127/
关键词：
Acoustical physical constants New determination method Line-focus-beam acoustic microscopy bulk ultrasonic spectroscopy LiNbO_3 and LiTaO_3 Leaky surface acoustic wave velocity Bulk longitudinal shear velocity Density

项目摘要

In this study, we have developed a new method of determining the acoustical physical constants associated with piezoelectric crystals, using two systems of line-focus-beam acoustic microscopy and bulk ultrasonic spectroscopy, and have determined precisely all the independent constants of LiNbO_3 and LiTaO_3 single crystals, including the density.1. In order to improve reliability and reproducibility of the two systems, the measurement environment of temperature has been stabilized and a laser interferometer has been introduced to measure the absolute distance. Absolute accuracy of better than (]SY.+-。[)0.01% in velocity has been achieved.2. Many crystalline plane specimens of LiNbO_3 and LiTaO_3 with optically polished surfaces and excellent parallelism of front and back surfaces have been prepared from one ingot for each crystal.3. A new method of determining the acoustical physical constants, viz., stiffness, piezoelectric, and dielectric constants, has been developed using the two systems for velocity measurements.4. The acoustical physical constants of LiNbO_3 and LiTaO_3 have been determined, which provide five significant digits for bulk and surface acoustic wave velocities.5. The elastic constants for multi-domain LiTaO_3 crystals have been also determined, for the first time, and have been compared with those for single-domain LiTaO_3 crystals. It has been shown that the poling operation to introduce piezoelectricity is responsible for the differences of elastic properties between single-and multi-domain crystals.

在这项研究中，我们开发了一种新的方法来确定与压电晶体相关的声学物理常数，使用线聚焦光束声学显微镜和体超声光谱两种系统，并精确地确定了LiNbO_3和LiTaO_3单晶的所有独立常数，包括密度。为了提高两种系统的可靠性和再现性，稳定了温度测量环境，并引入激光干涉仪测量绝对距离。在速度上的绝对精度优于（]SY.+-[）0.01%。用一个铸锭制备了许多具有光学抛光表面和前后表面良好平行度的LiNbO_3和LiTaO_3晶体平面试样。一种测定声学物理常数，即刚度、压电常数和介电常数的新方法已被开发出来，使用这两种系统进行速度测量。测定了LiNbO_3和LiTaO_3的声物理常数，提供了体速和面速的五位有效数字。首次测定了多畴LiTaO_3晶体的弹性常数，并与单畴LiTaO_3晶体的弹性常数进行了比较。结果表明，引入压电性的极化操作是造成单畴晶体和多畴晶体弹性性能差异的原因。