Electromechanical properties of CaZrO3 modified (K,Na)NbO3-based lead-free piezoceramics under uniaxial stress conditions

Ke Wang*, Fang Zhou Yao, Jurij Koruza, Li Qian Cheng, Florian H. Schader, Mao Hua Zhang, Jürgen Rödel, Jing Feng Li, Kyle G. Webber

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Piezoelectric actuators are typically preloaded with a modest mechanical compressive stress during actuation to reduce cracking and allow for operation in the dynamic range. In addition, actuators are required to carry out mechanical work during operation, resulting in a nonlinear relationship between stress and actuation voltage. In fact, mechanical loading can significantly impact the electromechanical performance of lead-free piezoelectrics. Herein, we report the dependence of electromechanical properties of CaZrO3 modified (K,Na)NbO3-based lead-free piezoceramics on uniaxial compressive stress, comparing to their lead-based counterparts. It is demonstrated that increased non-180° domain switching enhances the strain output at a moderate stress of approximately −50 MPa from room temperature to 150°C. Larger uniaxial stress, however, is found to suppress ferroelectric domain switching, resulting in the continuous strain and polarization decrease.

Original languageEnglish
Pages (from-to)2116-2122
Number of pages7
JournalJournal of the American Ceramic Society
Issue number5
Publication statusPublished - 1 May 2017


  • electromechanical properties
  • lead-free ceramics
  • niobium/niobium compounds
  • piezoelectric materials/properties
  • stress

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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