A review of langasite material constants from BAW and SAW data: toward an improved data set

Author

Kosinski, John A. ; Pastore, Robert A., Jr. ; Bigler, Emmanuel ; Da Cunha, Mauricio ; Malocha, Donald C. ; Detaint, Jacques

Author_Institution

US Army CECOM, Fort Monmouth, NJ, USA

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

278

Lastpage

286

Abstract

The aim of this paper is to derive an improved set of Langasite (LGS) material constants based on BAW and SAW data in order to get a better agreement between theoretical predictions and experimental measurements for wave velocities and temperature effects. In a previous work it was shown that an "aggregate" set of the measured values of bulk wave velocities can provide a improved set of measurement data for BAW propagation. Recent advances in LGS crystal growth and measurement of material properties obtained independently from the original authors allows us to go further, one unsolved problem with previous data being inconsistencies in the temperature derivatives of material constants of LGS. This paper brings together a large quantity of experimental data obtained independently by the authors. Comparison between experiments and theoretical predictions are recomputed taking into account the more recently published data sets for LGS. In combination with a critical analysis of the literature on LGS crystals, an improvement of a "best fit" data set for velocities is proposed

Keywords

bulk acoustic wave devices; elastic constants; gallium compounds; lanthanum compounds; lattice constants; permittivity; piezoelectric materials; reviews; surface acoustic waves; BAW data; BAW propagation; La₃Ga₅SiO₁₄; SAW data; best fit data set; dielectric constants; effective modal stiffnesses; elastic constants; improved data set; internal structure; langasite material constants; lattice constants; mass density; piezoelectric constants; temperature derivatives; Aggregates; Crystalline materials; Crystals; Dielectric materials; Material properties; Research and development; Surface acoustic waves; Telecommunications; Temperature; Velocity measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and PDA Exhibition, 2001. Proceedings of the 2001 IEEE International

Conference_Location

Seattle, WA

ISSN

1075-6787

Print_ISBN

0-7803-7028-7

Type

conf

DOI

10.1109/FREQ.2001.956203

Filename

956203