Grain size effect on electrical properties of Mn-modified 0.67BiFeO3-0.33BaTiO3 lead-free piezoelectric ceramics

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19 Citations (Scopus)

Abstract

To investigate how grain size affects the dielectric, ferroelectric, and piezoelectric properties of Mn-modified 0.67BiFeO3-0.33BaTiO3 ceramics, we prepared samples with a wide variety of grain sizes from 4.1μm to 0.59μm via a conventional solid-state process that use the normal and the two-step sintering methods. Small-signal dielectric measurements show that all the samples exhibit a relaxor-like behavior and that grain size has little influence on the room-temperature dielectric permittivity. For grain sizes below 2μm, the remanent polarization P r and piezoelectric coefficient d 33 decrease with the grain size, whereas they remain almost constant near P r = 27μC/cm2 and d 33 = 70 pC/N in samples with grain sizes exceeding 2μm. The mechanism underlying the observed grain size effect is discussed in terms of the electric-field-induced formation of macroscopic ferroelectric domains.

Original languageEnglish
JournalCeramics International
DOIs
Publication statusAccepted/In press - 2015 Dec 10

Keywords

  • Grain size effect
  • Lead free
  • Piezoelectric ceramics
  • Relaxor

ASJC Scopus subject areas

  • Ceramics and Composites
  • Process Chemistry and Technology
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Materials Chemistry

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