Dependence of acoustic property on Al substitution for Ca3Ta(Ga1-xAlx)(3)Si2O14 single crystals

作者：Ohashi Yuji; Arakawa Mototaka; Kudo Tetsuo; Yokota Yuui; Shoji Yasuhiro; Kurosawa Shunsuke; Kamada Kei; Kushibiki Jun ichi; Yoshikawa Akira

来源：Japanese Journal of Applied Physics, 2016, 55(7): 07KB06.

DOI：10.7567/JJAP.55.07KB06

The acoustic properties of Ca3Ta(Ga1-xAlx)(3)Si2O14 (CTGASx) were experimentally studied as a function of the Al substitution content x in the ranges from x = 0 to 0.50. Five specimens, X-, Y-, Z-, 35 degrees Y-, and 140 degrees Y- cut, were prepared from each crystal of CTGASx (x = 0, 0.25, and 0.50) grown by the Czochralski technique. Longitudinal wave and shear wave velocities for CTGASx linearly increase with Al content for all propagation directions. Dielectric constants and density were measured and then elastic and piezoelectric constants were determined from the measured velocities for each crystal. The results revealed that all of the constants change linearly with Al content. From the relationship, the constants for CTAS (x = 1) were estimated. Calculations of the velocities using the determined constants also suggested that the maximum electromechanical coupling factor k(2) for the slow shear wave mode propagating along the rotated Y- axis direction of CTAS was improved to 4.42% compared with 3.83% for CTGS, owing to the Al substitution effect.

• 出版日期2016-7