Title :
Improved material constants for LiNbO3 and LiTaO3
Author :
Kovacs, G. ; Anhorn, M. ; Engan, H.E. ; Visintini, G. ; Ruppel, C.C.W.
Author_Institution :
Fac. of Electr. Eng., Tech. Univ. Vienna, Austria
Abstract :
Measurements of SAW (surface acoustic wave) velocities on the entire surface of free and metallized substrates of 128° rotY-LiNbO 3 are reported. The influence of mechanical loading is examined. All experimental data are given as trigonometric expansions. Improved sets of material constants for LiNbO3 and LiTaO3 are calculated by fitting them to the experimentally determined SAW velocities. In agreement with R. Graham (1977), a significantly larger value of e33 was found for LiNbO3. While all material constants of LiBnO3 and most of LiTaO3 have reasonable error bounds, further improvements are expected from more accurately measured unclamped permittivities
Keywords :
lithium compounds; permittivity; piezoelectric materials; surface acoustic waves; ultrasonic velocity; LiNbO3; LiTaO3; SAW velocities; dielectric constants; material constants; mechanical loading; metallized substrates; piezoelectric; trigonometric expansions; unclamped permittivities; Crystalline materials; Dielectric materials; Dielectric measurements; Dielectric substrates; Least squares methods; Piezoelectric devices; Research and development; Surface acoustic wave devices; Surface acoustic waves; Velocity measurement;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171403
