Wide range dielectric spectroscopy on perovskite dielectrics

Takasi Teranisi, Takuya Hoshina, Takaaki Tsurumi

Research output: Contribution to journalArticle

38 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

Fingerprint

Dielectric spectroscopy
Perovskite
Permittivity
Polarization
spectroscopy
Ferroelectric materials
Domain walls
permittivity
grain size
polarization
ceramics
dipoles
broadband
domain wall
Dielectric relaxation
Dielectric losses
perovskite
ferroelectric materials
Phase transitions
dielectric loss

Keywords

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

ASJC Scopus subject areas

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

Cite this

Wide range dielectric spectroscopy on perovskite dielectrics. / Teranisi, Takasi; Hoshina, Takuya; Tsurumi, Takaaki.

In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology, Vol. 161, No. 1-3, 15.04.2009, p. 55-60.

Research output: Contribution to journalArticle

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