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Lead-free KNLNT Piezoelectric Ceramics for High-frequency Ultrasonic Transducer Application

机译：适用于高频超声换能器的无铅KNLNT压电陶瓷

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摘要

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.
机译：本文介绍了无铅压电陶瓷的最新发展及其在适用于高频超声成像的换能器中的应用。制备并表征了一种无铅压电陶瓷，其分子式为（K0.5Na0.5）0.97Li0.03（Nb0.9 ​​Ta0.1）O3（缩写为KNLNT-0.03 / 0.10）。发现该材料具有钳制的介电常数ε33 S =ε0= 890，压电系数d33 = 245 pC / N，机电耦合系数kt = 0.42，居里温度Tc> 300°C。使用无铅材料成功制造了高频（40 MHz）超声换能器。代表性的无铅传感器的带宽为45％，双向插入损耗为-18 dB。该性能与流行的基于铅的换能器的报道性能相当。比较结果表明，无铅压电材料可以替代高频超声换能器应用中的铅基压电材料。

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