Electroelastic Effect of Thickness Mode Langasite Resonators

Abstract

Langasite is a very promising material for resonators due to its good temperature behavior and high piezoelectric coupling, low acoustic loss, and high Q factor. The biasing effect for langasite resonators is crucial for resonator design. In this article, the resonant frequency shift of a thickness-mode langasite resonator is analyzed with respect to a direct current (DC) electric field applied in the thickness direction. The vibration modes of a thin langasite plate fully coated with an electrode are analyzed. The analysis is based on the theory for small fields superposed on a bias in electroelastic bodies and the first-order perturbation integral theory. The electroelastic effect of the resonator is analyzed by both analytical and finite-element methods. The complete set of nonlinear elastic, piezoelectric, dielectric permeability, and electrostrictive constants of langasite is used in the theoretical and numerical analysis. The sensitivity of electroelastic effect to nonlinear material constants is analyzed.

A review on the modeling and validation of biomass pyrolysis with a focus on product yield and composition

“…As the primary idea, the surface wave is excited on a piezoelectric substrate (Jakubik, 2011). To detect the major gas species during the hightemperature biomass pyrolysis, Zhang et al (2010Zhang et al ( , 2012Zhang et al ( and 2016 and Zhang and Kosinski (2013) investigated the velocity shifts caused by high temperature in quartz SAW resonators by analyzing contributions of nonlinear material constants. c.…”

Dispersion Diagram of Trigonal Piezoelectric Phononic Structures with Langasite Inclusions

“…Langasite (La 3 Ga 5 SiO 14 ) has been studied in recent years for sensor application [21], because of its unique piezoelectric properties [22,23]. Therefore, Langasite is a potential candidate for the piezoelectric material of transducers using PnSs, thanks to the good material properties, such as good temperature behaviour [23], high piezoelectric coupling, low acoustic loss, high Q factor [24] and mass density compared to quartz [25]. Motivated by these issues, the dispersion diagram of 1-3 piezoelectric phononic structures (PPnSs) with Langasite inclusions in a polymeric matrix is reported for the first time, to the best of our knowledge.…”