Wide range dielectric spectroscopy on perovskite dielectrics

Takashi Teranishi, Takuya Hoshina, Takaaki Tsurumi

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Wide band dielectric spectra from the kilohertz to terahertz range were discussed for SrTiO3 (ST) and BaTiO3-based ceramics. The dielectric permittivity of BaTiO3 (BT) is determined by the ionic polarization of the Slater mode as well as the dipole polarization of domain-wall vibrations in micro-sized domains. (Bax,Sr1 - x)TiO3 (BST) shows relatively high dielectric permittivity with a low dielectric loss up to GHz region, while Ba(ZrxTi1 - x)O3 (BZT) shows a high permittivity with dielectric relaxation at MHz range. The dielectric dispersion in the BZT was due to the dipole fluctuation in polar nano-regions (PNR) in relaxors. The change of dielectric spectrum from BT to BZT was interpreted by the change from normal ferroelectrics to relaxors via ferroelectrics with diffuse phase transition (DPT-ferro.). Wide band dielectric spectra were also measured for BT ceramics with different grain and domain sizes to elucidate the size effect observed in BT ceramics. The low-frequency permittivity increased with decreasing grain size when the grain size was above 1 μm. It was found that the dipole polarization due to the domain-wall motion was enhanced with increasing domain density. We demonstrated wide band dielectric spectroscopy is a powerful tool to investigate the polarization mechanism of dielectric and ferroelectric materials.

Original languageEnglish
Pages (from-to)55-60
Number of pages6
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume161
Issue number1-3
DOIs
Publication statusPublished - Apr 15 2009
Externally publishedYes

Keywords

  • Barium titanate
  • Dielectric dispersion
  • Ferroelectric domain
  • Ferroelectrics
  • Relaxor
  • Size effect

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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