Phase field simulation on the electromechanical response of poled barium titanate polycrystals with oxygen vacancies

Yasuhide Shindo, Fumio Narita, Takuya Kobayashi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

This work investigates the electromechanical response of poled barium titanate (BaTiO3) polycrystals with oxygen vacancies at room temperature. A phase field model is developed for ferroelectric 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 employed. The hysteresis loop (polarization vs electric field curve) and butterfly loop (strain vs electric field curve) are computed, and the effects of grain size and oxygen vacancy density on the dielectric and piezoelectric properties of the BaTiO3 polycrystals are discussed.

Original languageEnglish
Article number234103
JournalJournal of Applied Physics
Volume117
Issue number23
DOIs
Publication statusPublished - 2015 Jun 19

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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