La 3Ta 0.5Ga 5.3Al 0.2O 14 (LTGA) were measured by combing plane-wave ultrasonic microspectroscopy (PW-UMS) technology with the resonance-antiresonance method in a range from room temperature to 1000 °C. The influence of dielectric loss at high temperatures on resonance and antiresonance frequencies was discussed. At room temperature, the piezoelectric constants d 11 and d 14 were 6.62 and °4:65 pC/N, respectively. d 11 increased to 7.5 pC/N at 1000 °C. The electromechanical coupling factor k 12 was about 16.8% in the entire temperature range. All the necessary parameters of the LTGA crystal for acoustic wave applications at high temperatures were determined in this research.
ASJC Scopus subject areas
- Physics and Astronomy(all)