Comprehensive Performance Optimization in KNN-Based Piezoelectric Ceramics for an Ultrasonic Transducer

Han Y, Guan S, Xie L, Zhang K, Yang T, Quan Y, Xing J, Fei C, Tan Z, Webber KG, Zhu J (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Inorganic Chemistry American Chemical Society

Book Volume: 64

Pages Range: 22889-22901

Journal Issue: 46

DOI: 10.1021/acs.inorgchem.5c04075

Abstract

Potassium sodium niobate (KNN) ceramics, characterized by their high Curie temperature (TC), favorable piezoelectric coefficients, and relatively low density, represent an environmentally friendly alternative to lead-based piezoelectrics. The fundamental challenge lies in simultaneous optimization of their piezoelectric performance─particularly piezoelectric coefficient d33and electromechanical coupling coefficient kp─while preserving both thermal stability and TC. Herein, a targeted doping strategy is proposed to optimize the composition of the KNN-based ceramics. The controlled acceptor doping in the multiphase coexistence system enables the regulation of grain size, and the disturbance of the long-range ordered structure leads to the formation of nanodomains, which further enhance the piezoelectric response. Excellent densification and uniform microstructure contribute to both high TCand enhanced piezoelectric performance while ensuring stability across varying temperatures and frequencies. The optimized composition (x = 0.4) achieves exceptional piezoelectric properties: d33= 358 pC/N and kp= 56.6%. In addition, it demonstrates a TCof 315 °C and good thermal stability. The optimized KNN-based ultrasonic transducer exhibits a 3.19 MHz center frequency with 60% bandwidth (−6 dB) and achieves high-resolution imaging, demonstrating excellent signal transduction capabilities suitable for mid-to-high frequency ultrasonic devices and energy harvesting applications.

Authors with CRIS profile

Lixu Xie Lehrstuhl für Glas und Keramik (WW3) Kyle Grant Webber Professur für Werkstoffwissenschaften (Funktionskeramik)

Involved external institutions

Sichuan University (SCU) / 四川大学 CN China (CN) Xidian University CN China (CN)

How to cite

APA:

Han, Y., Guan, S., Xie, L., Zhang, K., Yang, T., Quan, Y.,... Zhu, J. (2025). Comprehensive Performance Optimization in KNN-Based Piezoelectric Ceramics for an Ultrasonic Transducer. Inorganic Chemistry, 64(46), 22889-22901. https://doi.org/10.1021/acs.inorgchem.5c04075

MLA:

Han, Yu, et al. "Comprehensive Performance Optimization in KNN-Based Piezoelectric Ceramics for an Ultrasonic Transducer." Inorganic Chemistry 64.46 (2025): 22889-22901.

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