Enhanced Field-Induced Strain in the Textured Lead-Free Ceramic

Yongjie Zhao*, Xiaowen Zhang, Rongxia Huang, Kepi Chen, Hui Wang, Haibo Jin, Heping Zhou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Reactive template grain growth method was applied to prepare <001> grain oriented 0.94(Na0.52K0.48)NbO3–0.06LiNbO3 ceramics using plate-like NaNbO3 particles as template. A two-step sintering procedure was put forward to obtain textured ceramics with electromechanical coupling factor kp = 64%, piezoelectric constant d33 = 220 pC/N, and in practical application the value of available d*33 (converse piezoelectric constant) is about 516 pm/V, which are much higher than these of random form with same composition. Based on the analysis for the behavior of piezoelectricity against the measuring frequency and the intensity of external field, a possible mechanism considering the interaction between defect dipoles induced by the doping of Cu2+ and spontaneous polarization dipoles was proposed to elucidate the field-induced giant strain in textured ceramics. This study does not only provide an insight to the origin and coupling effect of two kinds of dipole but also renders a general approach of defect engineering to take advantage of point defect in ceramics realizing certain function enhancement.

Original languageEnglish
Pages (from-to)3985-3992
Number of pages8
JournalJournal of the American Ceramic Society
Volume99
Issue number12
DOIs
Publication statusPublished - 2016

Keywords

  • defect engineering
  • lead-free ceramics
  • piezoelectric materials/properties
  • tape casting

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