Title :
Temperature stability of SAW on langasite single crystals
Author :
Inoue, Kenji ; Sato, Katsuo
Author_Institution :
Ad. Products Dev. Center, TDK Corp., Chiba, Japan
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;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.762151
