Langasite: what temperature coefficients of material constants are correct?

Author

Taziev, Rinat M.

Author_Institution

Inst. of Semicond. Phys., Acad. of Sci., Novosibirsk, Russia

Volume

2

fYear

1999

fDate

1999

Firstpage

835

Abstract

The paper presents an evaluation of the temperature coefficients of elastic constants of langasite on both BAW and SAW delay-temperature dependence data. Least squares method is used to fit the temperature coefficients of the elastic constants of langasite to the measured BAW and SAW temperature coefficients of delay of the first order (TCDI). For sufficient decrease of computation time, the perturbation procedure is employed. That allows us to fit optimally the constants of crystals in order to get the coincidence with experimental BAW and SAW delay-temperature data using only 1 iteration step in a computer

Keywords

elastic constants; gallium compounds; lanthanum compounds; least squares approximations; perturbation theory; piezoelectric materials; surface acoustic waves; BAW delay; La₃Ga₅SiO₁₄; SAW delay; elastic constant; langasite; least squares method; perturbation theory; piezoelectric material; temperature coefficient; Crystalline materials; Crystals; Least squares methods; Piezoelectric materials; Propagation delay; SAW filters; Surface acoustic waves; Temperature dependence; Temperature sensors; Thermal expansion;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European

Conference_Location

Besancon

ISSN

1075-6787

Print_ISBN

0-7803-5400-1

Type

conf

DOI

10.1109/FREQ.1999.841434

Filename

841434