Title :
Langasite: what temperature coefficients of material constants are correct?
Author :
Taziev, Rinat M.
Author_Institution :
Inst. of Semicond. Phys., Acad. of Sci., Novosibirsk, Russia
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;
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
Print_ISBN :
0-7803-5400-1
DOI :
10.1109/FREQ.1999.841434
