Piezoelectric Properties of Ca3NbGa3Si2O14 Single Crystal

概要

論文の詳細を見る
Langasite-type single crystal Ca3NbGa3Si2O14 (CNGS) was grown by the Czochralski technique. Dielectric, elastic and piezoelectric constants of CNGS were measured by the resonance-antiresonance method. At room temperature, dielectric constants $\epsilon_{11}^{\text{T}}/\epsilon_{0}$ and $\epsilon_{33}^{\text{T}}/\epsilon_{0}$ were 17.8 and 27.9, respectively. Electromechanical coupling coefficients $k_{12}$, $k_{25}$ and $k_{26}$ were also determined as 10.9, 17.3 and 11.9%, respectively. The measurements were carried out in a temperature range from $-30$ to 80°C. Temperature coefficients of the dielectric, elastic and piezoelectric constants were obtained. The line-focus-beam and plane-wave ultrasonic material characterization system was employed for measuring bulk acoustic velocities, and longitudinal and transverse wave velocities of 7408.4 m/s and 3136.2 m/s, respectively, in the $c$-direction uncoupled with piezoelectricity at 23°C were obtained. This was in good agreement with the results determined by the resonance-antiresonance method. The density of CNGS was 4125 kg/m3. All the parameters of the CNGS crystal for bulk and surface acoustic wave applications were determined in this research.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-09-15