Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27586
Title: Lead-free KNLNT piezoelectric ceramics for high-frequency ultrasonic transducer application
Authors: Wu, DW
Chen, RM
Zhou, QF
Shung, KK
Lin, DM
Chan, HLW 
Keywords: High-frequency
Lead-free
Piezoelectric materials
Ultrasound transducer
Issue Date: 2009
Publisher: Elsevier
Source: Ultrasonics, 2009, v. 49, no. 3, p. 395-398 How to cite?
Journal: Ultrasonics 
Abstract: This paper presents the latest development of a lead-free piezoelectric ceramic and its application to transducers suitable for high-frequency ultrasonic imaging. A lead-free piezoelectric ceramic with formula of (K0.5Na0.5)0.97Li0.03(Nb0.9 Ta0.1)O3 (abbreviated as KNLNT-0.03/0.10) was fabricated and characterized. The material was found to have a clamped dielectric constant ε33S/ε0 = 890, piezoelectric coefficient d33 = 245 pC/N, electromechanical coupling factor kt = 0.42 and Curie temperature Tc > 300 °C. High-frequency (40 MHz) ultrasound transducers were successfully fabricated with the lead-free material. A representative lead-free transducer had a bandwidth of 45%, two-way insertion loss of -18 dB. This performance is comparable to reported performances of popular lead-based transducers. The comparison results suggest that the lead-free piezoelectric material may serve as an alternative to lead-based piezoelectric materials for high-frequency ultrasonic transducer applications.
URI: http://hdl.handle.net/10397/27586
ISSN: 0041-624X
EISSN: 1874-9968
DOI: 10.1016/j.ultras.2008.11.003
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