Evaluation of dielectric and piezoelectric behavior of unpoled and poled barium titanate polycrystals with oxygen vacancies using phase field method

Fumio Narita, Takuya Kobayashi, Yasuhide Shindo

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

This article studies the dielectric and piezoelectric behavior of unpoled and poled barium titanate (BaTiO3) polycrystals with oxygen vacancies. A phase field model is employed for BaTiO3 polycrystals, coupled with the time-dependent Ginzburg–Landau theory and the oxygen vacancies diffusion, to demonstrate the interaction between oxygen vacancies and domain evolutions. To generate grain structures, the phase field model for grain growth is also used. The hysteresis loop and butterfly curve are predicted at room and high temperatures. The permittivity, and longitudinal and transverse piezoelectric constants of the BaTiO3 polycrystals are then examined for various grain sizes and oxygen vacancy densities.

Original languageEnglish
Pages (from-to)265-275
Number of pages11
JournalInternational Journal of Smart and Nano Materials
Volume7
Issue number4
DOIs
Publication statusPublished - 2016 Oct 1

Keywords

  • Mesomechanics
  • ferroelectric ceramics
  • phase field method
  • piezoelectric property
  • smart materials and structures

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science(all)
  • Mechanics of Materials

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