title: High-frequency ultrasonic transducer based on lead-free BSZT piezoceramics.
abstract: This paper describes the fabrication and evaluation of a high-frequency (40MHz) transducer based on lead-free piezoceramics for ultrasonic imaging. The transducer with an aperture size of 0.9mm has been fabricated using barium strontium zirconate titanate ((Ba(0.95)Sr(0.05))(Zr(0.05)Ti(0.95))O(3), abbreviated as BSZT) ceramics. The lead-free BSZT has a piezoelectric d(33) coefficient of 300 pC/N and an electromechanical coupling factor k(t) of 0.45. High-frequency ultrasound transducers were fabricated and a bandwidth of 76.4% has been achieved with an insertion loss of -26dB. Applications in high resolution biological and medical imaging could be possible with this lead-free material.
authors.affiliation: Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Kowloon, Hong Kong. felix_leo6288@hotmail.com
authors.forename: S T F
authors.initials: ST
authors.lastname: Lee
authors.forename: K H
authors.initials: KH
authors.lastname: Lam
authors.forename: X M
authors.initials: XM
authors.lastname: Zhang
authors.forename: H L W
authors.initials: HL
authors.lastname: Chan
mesh_terms: D001464:Barium; D002516:Ceramics / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D008422:Materials Testing; D013324:Strontium; D014025:Titanium; D014159:Transducers; D014463:Ultrasonography / Q000295:instrumentation*; D015040:Zirconium
chemical_list: D001464:Barium; D015040:Zirconium; D014025:Titanium; D013324:Strontium