Lead-free KNLNT piezoelectric ceramics for high-frequency ultrasonic transducer application.

Ultrasonics
D W WuHelen L W Chan

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 (K(0.5)Na(0.5))(0.97)Li(0.03)(Nb(0.9) Ta(0.1))O(3) (abbreviated as KNLNT-0.03/0.10) was fabricated and characterized. The material was found to have a clamped dielectric constant epsilon(33)(S)/epsilon(0)=890, piezoelectric coefficient d(33)=245 pC/N, electromechanical coupling factor k(t)=0.42 and Curie temperature T(c)>300 degrees 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.

References

Feb 25, 2000·Ultrasound in Medicine & Biology·F S FosterD H Turnbull
Mar 13, 2002·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Kevin A SnookK Kirk Shung
Nov 2, 2004·Nature·Yasuyoshi SaitoMasaya Nakamura
Mar 23, 2007·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Qifa ZhouK Kirk Shung
Jan 1, 1993·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·F S FosterA M Rauth

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Citations

Aug 18, 2012·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·M Mehdi HejaziAhmad Safari
Feb 2, 2018·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Zhiqiang ZhangQifa Zhou
Sep 6, 2018·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Zhiqiang ZhangWeibao Qiu
Jan 9, 2020·Chemical Society Reviews·Xiang LvJiagang Wu

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