Title :
Langasite, langanite, and langatate resonators: recent results
Author :
Smythe, R.C. ; Helmbold, R.C. ; Hague, G.E. ; Snow, K.A.
Author_Institution :
Piezo Technol. Inc., Orlando, FL, USA
Abstract :
Materials in the langasite family are of current interest for both bulk-wave and surface-wave devices. Plano-convex Y-cut bulk-wave resonators have been built and tested on overtones 1-9 using LGS (langasite, La3Ga5SiO14), LGN (langanite, La3Ga5.5Nb0.5O14), and LGT (langatate, La3Ga5.5Ta0.5O14). Frequencies and motional inductances are compared with calculated values, with good agreement except for the motional inductance of LGT. For all 3 materials, frequency variation is an essentially parabolic function of temperature. For LGN and LGT, reported values of the Q-frequency product are significantly above the classical limit for AT-cut quartz
Keywords :
crystal resonators; lanthanum compounds; LGN; LGS; LGT; La3Ga5.5Nb0.5O14; La3Ga5.5Ta0.5O14; La3Ga5SiO14; Q-factor; langanite; langasite; langatate; motional inductance; overtone mode; plano-convex Y-cut bulk wave resonator; resonant frequency; temperature dependence; Acoustic materials; Acoustic measurements; Capacitance; Circuit testing; Equivalent circuits; Frequency measurement; Inductance measurement; Snow; Temperature; Thickness measurement;
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.1999.841430
