Effect of oxygen partial pressure during sintering on electric properties of BiFeO3-based piezoelectric ceramics

Tomoya Aizawa, Ichiro Fujii, Shintaro Ueno, Tohru S. Suzuki, Satoshi Wada

Research output: Contribution to journalArticle

Abstract

The effects of oxygen partial pressure (pO2) during sintering and post-annealing treatment on the microstructure and electrical properties of Mn-added 0.3BaTiO30.1Bi(Mg1/2Ti1/2)O30.6BiFeO3 ceramics were investigated. The ceramics sintered at pO2 of 0.11 atm showed pinched polarizationelectric field (PE) loops, while the ceramics sintered in nitrogen gas could not be measured due to dielectric breakdown. By annealed at 800°C for 5 h and cooled slowly, the ceramics showed increased remanent polarizations although their PE loops were still pinched. When the as-sintered ceramics were annealed at 800°C for 5 h and then quenched into water, well-developed ferroelectric hysteresis loops were observed. These results were discussed with grain size and defect dipoles consisted of oxygen vacancies and bismuth vacancies or iron ions with a different valence.

Original languageEnglish
Pages (from-to)383-387
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume127
Issue number6
DOIs
Publication statusPublished - 2019 Jun 1
Externally publishedYes

Keywords

  • Ferroelectric
  • Oxygen partial pressure
  • Perovskite
  • Piezoelectric

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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