Accurate determination of material constants of piezoelectric crystal from SAW velocity measurements

Author

Kovacs, G. ; Trattnig, G. ; Langer, E.

Author_Institution

Inst. fuer Allgemeine Elektrotech. & Elektronik, Tech. Univ. Wien, Austria

fYear

1988

fDate

2-5 Oct 1988

Firstpage

269

Abstract

A nonlinear least-squares algorithm to determine the material constants of LiNbO₃ from primary SAW (surface acoustic wave) velocity measurements is shown. If the values of the mass density and the unclamped permittivities are known at least to some accuracy, all 13 independent elastic, piezoelectric, and dielectric constants are obtained with high precision. While measurements on Y-cut LiNbO ₃ do not provide enough information to perform this task, the SAW velocities on 128°-rot-Y-cut LiNbO₃ are sensitive to all material constants. This method is not restricted to LiNbO₃ only, but can be applied to other strong coupling materials (e.g. LiTaO₃) as well

Keywords

elastic constants; least squares approximations; lithium compounds; permittivity; piezoelectric materials; surface acoustic waves; ultrasonic velocity; LiNbO₃; LiTaO₃; SAW velocity measurements; dielectric constants; elastic constant; material constants; nonlinear least-squares algorithm; piezoelectric constants; piezoelectric crystal; Acoustic materials; Acoustic measurements; Acoustic waves; Dielectric constant; Dielectric materials; Dielectric measurements; Permittivity; Piezoelectric materials; Surface acoustic waves; Velocity measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1988. Proceedings., IEEE 1988

Conference_Location

Chicago, IL

Type

conf

DOI

10.1109/ULTSYM.1988.49381

Filename

49381