Dielectric Properties of Barium Titanate Ceramics with Nano-Sized Domain

Yoichi Kigoshi; Saki Hatta; Takashi  Teranishi; Takuya Hoshina; Hiroaki Takeda; Osamu Sakurai; Takaaki Tsurumi

doi:10.4028/www.scientific.net/KEM.445.27

Paper Titles

Enhanced Piezoelectric Properties of Barium Titanate-Potassium Niobate Solid Solution System Ceramics by MPB Engineering
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Fabrication and Microstructure of Grain-Oriented (Bi_1/2K_1/2)TiO₃ Ceramics
p.15

Effect of Al₂O₃ Additives in PZT-Pb(Mn_1/3Nb_2/3)O₃ Ceramics
p.19

Crystal Structure Analysis of High T_C Barium Titanate – Bismuth Perovskite-Type Oxide System Ceramics and their Piezoelectric Property
p.23

Dielectric Properties of Barium Titanate Ceramics with Nano-Sized Domain
p.27

Evolution of Internal Stress and Influence on Dielectric Properties by Number of Dielectric Layers in MLCC
p.31

Degradation of Resistance over Time for Multilayer Ceramic Capacitors
p.35

Analysis of Oxygen Vacancy Trapping at [001] Symmetric Tilt Grain Boundaries in Barium Titanate by Atomistic Simulations
p.39

Improvement of Compact X-Rays Source Using Uniaxially Polarized LiNbO₃ Single Crystal
p.43

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Dielectric Properties of Barium Titanate Ceramics with Nano-Sized Domain

Abstract:

Barium titanate (BaTiO3) ceramics with various grain sizes from 0.7 to 13 μm on average were prepared by a conventional sintering method, a two-step sintering method and a rate controlled two-step sintering method. The permittivity of the ceramics was increased with decreasing grain size to 1.1 μm on average. However, the permittivity of the ceramics was decreased when the grain size was below 1 μm. The field emission scanning electron microscope (FE-SEM) observations revealed that the 90º domain width decreased with decreasing the grain size. By ultrawide range dielectric spectra from kHz to THz range of the BaTiO3 ceramics, the domain contribution to the permittivity was investigated. For the BaTiO3 ceramics with grain sizes over 1 μm, the dipole polarizability and the ionic polarizability were enhanced by high domain-wall density. In contrast, for the BaTiO3 ceramics with grain sizes below 1 μm, these polarizabilities were weakened.