Numerical investigation of surface and leaky acoustic wave properties in SrLaGa3O7 crystal

Abstract

Abstract For surface acoustic wave (SAW) devices operating at elevated ambient temperatures, piezoelectric crystals that have stable material properties at high temperatures are desirable. The progress in the field of electronic technologies has increased the demand for high-temperature piezoelectric materials for the use in temperature and pressure sensors. Recently, SAW sensors have been operated at room temperature or 100°C ÷ 300°C at most. A new piezoelectric SrLaGa3O7 crystal belongs to tetragonal symmetry class, and has stability of its piezoelectric properties up to the melting temperature of 1650°C. Numerical simulation of the properties of surface and leaky acoustic waves in the SrLaGa3O7 single crystal is performed. The SAW has a maximum value of the electromechanical coupling coefficient (~ 0.25%) on Z+64°-cut and propagation direction along the X-axis. In the same propagation direction, the electromechanical coupling coefficient of the leaky wave is 3.5 times lower than that of SAW. The SAW has large electromechanical coupling coefficient value (~0.24%) on Z, X+45°-cut of the crystal. It is shown that these two cuts of the SrLaGa3O7 single crystal are promising for use in the SAW devices.