Piezoelectric and ferroelectric properties of Li-doped (Bi 0.5Na0.5)TiO3-(Bi0.5K 0.5)TiO3-BaTiO3 lead-free piezoelectric ceramics

Ye Jing Dai, Shujun Zhang, Thomas R. Shrout, Xiao Wen Zhang

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Abstract

The piezoelectric and ferroelectric properties of 0.852[Bi 0.5(Na(1-x)Lix)0.5]TiO 3-0.110(Bi0.5K0.5)TiO3-0. 038BaTiO3 (x=0, 0.02, 0.05, 0.10, 0.15, and 0.30, abbreviated as BNKLBTx) lead-free piezoelectric ceramics were prepared by conventional ceramic processing. X-ray diffraction on the samples revealed that Li+ ions diffused into the Bi0.5Na0.5TiO3 lattices (A-site) and formed a solid solution with a single perovskite structure. All the samples could be sintered at 1160°-1180°C, with the density being on the order of >95% of the theoretical. The ceramics with x=0.10 exhibited the highest properties, with the piezoelectric coefficient being on the order of d33=235 pC/N, while the electromechanical coupling factors were found to be kp=0.30 and kt=0.45, respectively. The dielectric, pyroelectric, electromechanical, and ferroelectric behaviors were investigated as a function of temperature. It was found that the depolarization temperature Td showed a strong dependence on the content of Li+ addition, shifting to a lower temperature with increasing Li+ dopant.

Original languageEnglish (US)
Pages (from-to)1108-1113
Number of pages6
JournalJournal of the American Ceramic Society
Volume93
Issue number4
DOIs
Publication statusPublished - Apr 1 2010

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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