Elastic properties of langasite-type crystals determined by bulk and surface acoustic waves

Autor:	E. Chilla, H.-J. Fröhlich, C. M. Flannery, U. Straube
Rok vydání:	2001
Předmět:	Materials science Acoustics Acoustic interferometer General Physics and Astronomy Acoustic wave Ion acoustic wave Computational physics Love wave symbols.namesake Lamb waves symbols Rayleigh wave Mechanical wave Longitudinal wave
Zdroj:	Journal of Applied Physics. 90:6084-6091
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1409574
Popis:	We have determined the elastic constants of langasite-type crystals (La3Ga5SiO14, La3Ga5.5Nb0.5O14, and La3Ga5.5Ta0.5O14) from measurements of the sound velocity of acoustic waves. Starting with the elastic tensor determined from bulk acoustic waves, we optimized the data set by investigating the influence of the elastic tensor components on the angular dispersion of surface guided waves. This procedure is particularly useful for accurate determination of the nondiagonal elements of the elastic tensor. Phase velocity calculations based on the new set of constants show an increased agreement with experimental data compared to the data set derived from bulk waves and previously published material data.
Databáze:	OpenAIRE
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