Title :
P6H-6 Lead-Free Piezoelectric Ceramics for High-Frequency Ultrasound Transducers
Author :
Wu, D.W. ; Chen, R.M. ; Zhou, Q.F. ; Lin, D.M. ; Chan, H.L.W. ; Shung, K.K.
Author_Institution :
Univ. of Southern California, Los Angeles
Abstract :
This paper presents the latest development of lead-free piezoelectric ceramics and their application to the high frequency ultrasound transducers. Three kinds of lead-free piezoelectric ceramics [(K0.5Na0.5)0.9Li0.03(Nb0.9Ta0.1)O3, K0.5Na0.5(Nb0.94Sb0.06)O3 + 0.5mol%MnO2 and K0.5Na0.5NbO3 + 0.5mol%MnO2] were fabricated and characterized. High frequency (40 MHz) ultrasound transducers were successfully fabricated with these ceramics. The performance of the transducers were evaluated and compared with transducers fabricated from lead-based materials. The results suggest that lead-free piezoelectric materials in some degree may serve as an alterative to lead-based piezoelectric materials for high-frequency ultrasonic transducer applications.
Keywords :
acoustic impedance; lithium compounds; manganese compounds; permittivity; piezoceramics; potassium compounds; sodium compounds; ultrasonic transducers; (K0.5Na0.5)0.97Li0.03(Nb0.9Ta0.1)O3; K0.5Na0.5(Nb0.94Sb0.06)O3; K0.5Na0.5NbO3; MnO2; acoustic impedance; dielectric constant; electromechanical coupling coefficients; frequency 40 MHz; high-frequency ultrasound transducers; lead-free piezoelectric ceramics; needle transducers; wide bandwidth transducer application; Biomedical transducers; Ceramics; Crystalline materials; Environmentally friendly manufacturing techniques; Fabrication; Frequency; Piezoelectric materials; Piezoelectric transducers; Ultrasonic imaging; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 2007. IEEE
Conference_Location :
New York, NY
Print_ISBN :
978-1-4244-1384-3
Electronic_ISBN :
1051-0117
DOI :
10.1109/ULTSYM.2007.652
