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

Volume

2

fYear

1999

fDate

1999

Firstpage

816

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, La₃Ga_5.5Nb_0.5O₁₄), and LGT (langatate, La₃Ga_5.5Ta_0.5O₁₄). 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; La₃Ga_5.5Nb_0.5O₁₄; La₃Ga_5.5Ta_0.5O₁₄; 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;

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.1999.841430

Filename

841430