Effect of SrTiO3 template on electric properties of textured BNT-BKT ceramics prepared by templated grain growth process

Wangfeng Bai, Lingyu Li, Wei Li, Bo Shen*, Jiwei Zhai, H. D. Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

In this work, 〈0 0 l〉 textured lead-free piezoelectric (1-x)(0.83 Bi0.5Na0.5TiO3-0.17Bi0.5K 0.5TiO3)-xSrTiO3 (BNT-BKT-xST) ceramics were fabricated by template grain growth in combination with tape casting using plate-like SrTiO3 as a template. The effect of ST template on the grain orientation, strain behavior, dielectric, ferroelectric, pyroelectric and piezoelectric properties was systematically investigated in order to search the lead-free piezoelectric materials with an excellent actuating performance. The templated growth of 〈0 0 l〉 oriented grains on the ST template resulted in textured ceramics with brick wall microstructures and significantly high 〈0 0 l〉 texture degree corresponding to >90% Lotgering factor at 9-15 mol% ST template. Textured ceramics showed excellent strain properties as compared to the random counterparts and encouraging results of large strain of 0.38% with normalized strain Smax/Emax = 626 pm/V for the textured critical composition with 15 mol% ST template were obtained at room temperature. Furthermore, the textured ceramics with 27 mol% ST template exhibited large electrostrictive coefficient Q11 of 0.023 m 4 C-2 and superior temperature stability compared to the random counterparts, which are very promising and makes them tremendous potential for the environmental-friendly solid-state actuator applications.

Original languageEnglish
Pages (from-to)149-157
Number of pages9
JournalJournal of Alloys and Compounds
Volume603
DOIs
StatePublished - 5 Aug 2014

Keywords

  • (BiNa)TiO ceramics
  • Electrostriction
  • Lead-free ceramics
  • Templated grain growth

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