Quasilongitudinal pseudosurface acoustic waves in trigonal crystals

Author

Kozlov, A.I.

Author_Institution

Inst. of Radio Eng. & Electron., Acad. of Sci., Moscow, Russia

Volume

1

fYear

1995

fDate

7-10 Nov 1995

Firstpage

197

Abstract

Quasilongitudinal pseudosurface acoustic wave (QLPSAW) progresses along a solid surface at a velocity exceeding those of the two slowest bulk waves and radiates them. Calculated properties of the wave in the X-axis direction of La₃Ga₅SiO₁₄ and of SiO₂ as well as on some doubly rotated cuts of LiNbO₃ and LiTaO₃ are discussed. Along the [100] axis of langasite QLPSAW is found, its velocity is less than that of longitudinal bulk wave and its attenuation coefficient is about 10 dB/wavelength. QLPSAW can exist in the same direction of quartz crystal too, but its velocity is greater than the fastest bulk wave speed, and attenuation is of the order of 10^-3-10^-2 dB/wavelength. In lithium niobate and lithium tantalate crystals directions of possible existence of QLPSAW form bounded regions. Attenuation of the wave tends to zero at the boundaries of the regions and its phase velocity is close to the speed of the longitudinal bulk wave

Keywords

ferroelectric materials; lanthanum compounds; lithium compounds; quartz; surface acoustic waves; ultrasonic absorption; ultrasonic propagation; ultrasonic velocity; La₃Ga₅SiO₁₄; LiNbO₃; LiTaO₃; QLPSAW; SiO₂; X-axis direction; attenuation coefficient; doubly rotated cuts; langasite; lithium niobate; lithium tantalate crystals; phase velocity; quartz crystal; quasilongitudinal pseudosurface acoustic waves; slowest bulk waves; solid surface; trigonal crystals; velocity; Acoustic propagation; Acoustic waves; Anisotropic magnetoresistance; Attenuation; Crystals; Glass; Lithium; SAW filters; Solids; Surface acoustic waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE

Conference_Location

Seattle, WA

ISSN

1051-0117

Print_ISBN

0-7803-2940-6

Type

conf

DOI

10.1109/ULTSYM.1995.495567

Filename

495567