PROJECT TITLE :
Acoustical physical constants around room temperature for Ca3TaGa1.5Al1.5Si2O14 single crystal
A full set of acoustical physical constants was resolute for Ca3TaGa1.5Al1.5Si2O14 (CTGAS) single crystal from bulk wave velocities measured by the ultrasonic micro-spectroscopy technique. Many plate specimens were cut perpendicular to the X-, Y-, Z-, thirty five.25°Y-, and 139.74°Y-directions from a CTGAS single crystal ingot grown by Czochralski technique. Following measurements of dielectric constants and density, elastic constants, piezoelectric constants, and their temperature coefficients were determined from longitudinal wave and shear wave velocities measured for the CTGAS specimens at around room temperature. It was demonstrated that the as found constants might offer calculation accuracy within ±zero.fifteen% in leaky surface acoustic wave velocity. The determined constants were used for numerical calculation of the cut angle, at that the temperature coefficient of shear wave velocity becomes zero. This angle corresponded to 147.nine°Y-cut substrate that had electromechanical coupling factor of k2 = 3.twopercent. This parameter is regarding four times larger than that of AT-cut α-quartz.
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