Title :
SAW properties of the single crystals in YCOB system
Author :
Nishida, T. ; Amano, T. ; Shiosaki, T. ; Nakao, H. ; Nishida, M. ; Mizutani, H.
Author_Institution :
Nara Inst. of Sci. & Technol., Japan
Abstract :
The new material GdxY(1-x)Ca4O(BO 3)3 (GdYCOB) exhibits excellent optical (SHG) characteristics, and their single crystals can be grown with CZ technique at a low cost. Hence, their piezoelectric properties are also very interesting, however, few studies on the piezoelectricity and SAW properties have been reported. In this study, SAW properties of GdYCOB are first presented. In order to investigate the properties IDTs were fabricated on YCa4O(BO3)3(x=0) and GdCa 4O(BO3)3 (x=1) crystals, and frequency response of radiation admittance and filter properties were measured. The X, Y and Z-cut crystals of YCOB were evaluated, revealing that the SAW velocity measured ranged from 2500 to 4300 m/s, and the high coupling factor (k2=0.5% at Z-axis propagation) and relatively low temperature coefficient of delay (TCD=50 ppm/K) were found at the X-cut sample. The higher coupling factor (k2~1.0%) was measured on GdCOB crystal. It is expected that the SAW properties comparable to those of LiTaO3 can be obtained in GdYCOB
Keywords :
calcium compounds; crystal growth from melt; gadolinium compounds; interdigital transducers; piezoelectric materials; surface acoustic wave filters; surface acoustic wave transducers; surface acoustic waves; yttrium compounds; Czochralski growth; GdCOB; GdCa4O(BO3)3; IDT; SAW velocity; YCOB; YCa4O(BO3)3; coupling factor; filter properties; frequency response; piezoelectric single crystal; radiation admittance; temperature coefficient of delay; Admittance; Costs; Crystalline materials; Crystals; Frequency response; Optical filters; Optical harmonic generation; Optical materials; Piezoelectricity; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 2001 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-7177-1
DOI :
10.1109/ULTSYM.2001.991604
