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<p>K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> (KNN)-based lead-free piezoelectric ceramics represent promising alternatives to Pb(Zr,Ti)O<sub>3</sub> (PZT) owing to their excellent piezoelectric properties and environmental benignity. However, temperature-dependent performance degradation and property trade-offs limit their practical applications. This review systematically analyzes seven key optimization strategies for simultaneously enhancing comprehensive properties and thermal stability: phase boundary engineering, texture engineering, nanodomain engineering, defect engineering, grain size engineering, composite design, and multi-strategy synergistic approaches. The structure–property relationships and underlying mechanisms of each strategy are comprehensively discussed through representative case studies. Critical analysis of the physical principles, merits, limitations, and future prospects of these approaches is provided. This comprehensive review serves as a valuable guide for the rational design and optimization of high-performance KNN-based ceramics, facilitating their implementation in environmentally sustainable piezoelectric applications.</p> Graphical abstract <p></p>

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Research progress on the simultaneous enhancement of comprehensive properties and temperature stability in KNN-based lead-free piezoelectric ceramics

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • Shengyan Yang,
  • Yang Zhang,
  • Zhongwen Wang,
  • Honglin Li

摘要

K0.5Na0.5NbO3 (KNN)-based lead-free piezoelectric ceramics represent promising alternatives to Pb(Zr,Ti)O3 (PZT) owing to their excellent piezoelectric properties and environmental benignity. However, temperature-dependent performance degradation and property trade-offs limit their practical applications. This review systematically analyzes seven key optimization strategies for simultaneously enhancing comprehensive properties and thermal stability: phase boundary engineering, texture engineering, nanodomain engineering, defect engineering, grain size engineering, composite design, and multi-strategy synergistic approaches. The structure–property relationships and underlying mechanisms of each strategy are comprehensively discussed through representative case studies. Critical analysis of the physical principles, merits, limitations, and future prospects of these approaches is provided. This comprehensive review serves as a valuable guide for the rational design and optimization of high-performance KNN-based ceramics, facilitating their implementation in environmentally sustainable piezoelectric applications.

Graphical abstract