Wide range dielectric spectroscopy on perovskite dielectrics

Takashi Teranishi, Takuya Hoshina, Takaaki Tsurumi


50 被引用数 (Scopus)


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.

ジャーナルMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
出版ステータスPublished - 4月 15 2009

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学


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