Temperature stability of SAW on langasite single crystals

Author

Inoue, Kenji ; Sato, Katsuo

Author_Institution

Ad. Products Dev. Center, TDK Corp., Chiba, Japan

Volume

1

fYear

1998

fDate

1998

Firstpage

301

Abstract

The propagation characteristics of surface acoustic waves (SAW) on La₃Ga₅SiO₁₄ were investigated by both numerical and experimental methods. The SAW velocity, the coupling coefficient (k²) and the temperature coefficient of delay (TCD) on X-cut, Y-cut and 50° rotated Y-cut substrates were investigated numerically. Then SAW properties were measured using transversal filters of different propagation directions on these cuts. The experimental results of the SAW velocity and the k² were in good agreement with the numerical results. However, except for some cuts, TCD in experiment differed from that of numerical calculations. The propagation direction and the electrode thickness dependence of the turnover temperature was investigated on the 50° rotated Y-cut substrate

Keywords

acoustic wave propagation; acoustic wave velocity; gallium compounds; lanthanum compounds; piezoelectric materials; surface acoustic waves; La₃Ga₅SiO₁₄; SAW velocity; X-cut substrates; Y-cut substrates; coupling coefficient; electrode thickness dependence; langasite single crystals; propagation characteristics; rotated Y-cut substrates; surface acoustic waves; temperature coefficient of delay; temperature stability; transversal filters; turnover temperature; Acoustic propagation; Acoustic waves; Crystals; Electrodes; Equations; Stability; Surface acoustic waves; Temperature dependence; Thermal expansion; Transversal filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE

Conference_Location

Sendai

ISSN

1051-0117

Print_ISBN

0-7803-4095-7

Type

conf

DOI

10.1109/ULTSYM.1998.762151

Filename

762151