Accurate determination of material constants of piezoelectric crystal from SAW velocity measurements
- 6 January 2003
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 269-272 vol.1
- https://doi.org/10.1109/ultsym.1988.49381
Abstract
A nonlinear least-squares algorithm to determine the material constants of LiNbO/sub 3/ 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/sub 3/ do not provide enough information to perform this task, the SAW velocities on 128 degrees -rot-Y-cut LiNbO/sub 3/ are sensitive to all material constants. This method is not restricted to LiNbO/sub 3/ only, but can be applied to other strong coupling materials (e.g. LiTaO/sub 3/) as well.<>Keywords
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