Acoustic Wave Characteristics of Lead-Free (Bi1/2Na1/2)0.99Ca0.01TiO3 Piezoelectric Ceramic
- 1 January 1989
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 28 (S2) , 59
- https://doi.org/10.7567/jjaps.28s2.59
Abstract
Acoustic wave characteristics of lead-free (Bi1/2Na1/2)0.99Ca0.01TiO3 (BNC-1) piezoelectric ceramic are studied from a viewpoint of a new substrate material group for a surface acoustic wave and/or a bulk acoustic wave. The BNC-1 ceramic, which has high electromechanical coupling factors, k 33(=37.6%) and k t(=51.3%), and low free permittivities, ε 33 T/ε 0(=236) and ε 11 T/ε 0(=271), along with a high mechanical strength, is favorable to high frequency ultrasonic uses. Two interdigital transducers can excite an SH plate mode wave or a Lamb mode wave whose travelling direction is perpendicular or parallel to the poling axis, respectively. A delay line type oscillator using the SH wave is demonstrated a single mode oscillation of 8.319 MHz.Keywords
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