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

fYear

2007

fDate

28-31 Oct. 2007

Firstpage

2590

Lastpage

2593

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 [(K_0.5Na_0.5)_0.9Li_0.03(Nb_0.9Ta_0.1)O₃, K_0.5Na_0.5(Nb_0.94Sb_0.06)O₃ + 0.5mol%MnO₂ and K_0.5Na_0.5NbO₃ + 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; (K_0.5Na_0.5)_0.97Li_0.03(Nb_0.9Ta_0.1)O₃; K_0.5Na_0.5(Nb_0.94Sb_0.06)O₃; K_0.5Na_0.5NbO₃; 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;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2007. IEEE

Conference_Location

New York, NY

ISSN

1051-0117

Print_ISBN

978-1-4244-1384-3

Electronic_ISBN

1051-0117

Type

conf

DOI

10.1109/ULTSYM.2007.652

Filename

4410225