Domain size effect on dielectric properties of barium titanate ceramics

被引：180

作者：

Hoshina, Takuya ^{[1
]}

Takizawa, Kayo ^{[1
]}

Li, Jianyong ^{[1
]}

Kasama, Takeshi ^{[2
]}

Kakemoto, Hirofumi ^{[1
]}

Tsurumi, Takaaki ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Met & Ceram Sci, Meguro Ku, Tokyo 1528552, Japan

[2] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS | 2008年 / 47卷 / 09期

关键词：

barium titanate; two-step sintering; dielectric property; domain size; size effect; wide range dielectric spectroscopy; polarization;

D O I：

10.1143/JJAP.47.7607

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

barium titanate (BaTiO3) ceramics with various grain sizes were prepared by a conventional sintering method and a two-step sintering mehod. The permittivity of the ceramics increased with decreasing the grain size down to 1.1 mu m on average. The BaTiO3 ceramics with an average grain size of 1.1 mu m had a high permittivity of 7,700. The transmission electron microscopy (TEM) observation realed that the 90 degrees domain density increased with decreasing the grain size. the domain size of the ceramics with the highest permittivity of 7,700 was approximately 100 nm. From an ultra wide range dielectric spectroscopy, it was found that the high domain density enhanced the orientational polarizability due to the domain-wall vibration and the ionic poarizability due to the lattice vibration. It was clarified that the increase of the permittivity with decreasing the grain size was due to the domain size effect.

引用

页码：7607 / 7611

页数：5

共 15 条

[1] DIELECTRIC-PROPERTIES OF FINE-GRAINED BARIUM-TITANATE CERAMICS [J].