Nonlinear behavior of BNT-based lead-free piezoceramics under various ac fields

S. H. Choy, H. L.W. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


In this study, two different bismuth sodium titanate (BNT) based lead-free piezoelectric ceramics, BNKBT-5 and BNKLBT-1.5, were fabricated and their nonlinear piezoelectric behaviour were compared. The ac field dependent piezoelectric properties of both lead-free materials were investigated. An analysis of the changes in real parts of the materials parameters (e.g. stiffness, permittivity and electromechanical coupling coefficient) and the loss factors have been determined by model fitting and the complex material parameters can be found. Under a high ac field, BNKBT-5 and BNKLBT-1.5 have different nonlinear behaviour. This characterization is necessary for using the lead-free piezoelectric ceramics in high power transducer applications.

Original languageEnglish
Pages (from-to)869-877
Number of pages9
JournalCurrent Applied Physics
Issue number3
Publication statusPublished - 1 May 2011


  • Lead-free ceramic
  • Mechanical properties
  • Piezoelectric properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)


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