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Review | Open Access

(K, Na)NbO3-based lead-free piezoceramics: Phase transition, sintering and property enhancement

Ke WANG, Jing-Feng LI*( )
State Key Laboratory of New Ceramic and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Abstract

Most widely used piezoelectric ceramics are based on Pb(Zr,Ti)O3 (PZT) composition which has adverse environmental and health effects due to its high lead content. Environmental and safety concerns with respect to the utilization, recycling, and disposal of lead-based piezoelectric ceramics have induced a new surge in developing lead-free piezoelectric ceramics. Among all the lead-free ceramics, (K,Na)NbO3 (KNN) has drawn increasing attention because of its well-balanced piezoelectric properties and better environmental compatibility. On basis of the author's work, this review summarizes the progress that has been made in recent years on development of KNN-based piezoelectric ceramics, including crystallographic structure and phase transition analysis, pressurized solid-state sintering as well as liquid-phase-assisted sintering process, and poling treatment for property enhancement. All in all, KNN is a promising lead-free system, but more research is still required both from academic and industrial interests.

Keywords

electrical propertiesferroelectric propertiespiezoelectric propertiesperovskitesniobateslead-free

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Journal of Advanced Ceramics
Volume 1 Issue 1,
March 2012
Pages 24-37
DOI: 10.1007/s40145-012-0003-3
Cite this article:
WANG K, LI J-F. (K, Na)NbO3-based lead-free piezoceramics: Phase transition, sintering and property enhancement. Journal of Advanced Ceramics, 2012, 1(1): 24-37. https://doi.org/10.1007/s40145-012-0003-3

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Received: 16 February 2012
Accepted: 01 March 2012
Published: 29 June 2012
© The author(s) 2012

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