Investigation of ferroelectric properties on nanocrystalline barium titanate ceramics

被引：1

作者：

Deng X. ^{[1
]}

Wang X. ^{[2
]}

Li D. ^{[1
]}

Li L. ^{[2
]}

机构：

[1] College of Physics and Electronic Information, Tianjin Normal University

[2] State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University

来源：

Frontiers of Materials Science in China | 2007年 / 1卷 / 3期

基金：

中国国家自然科学基金;

关键词：

Ferroelectric properties; Grain size; Nanocrystalline BaTiO[!sub]3[!/sub] (BT) ceramics;

D O I：

10.1007/s11706-007-0059-0

中图分类号：

学科分类号：

摘要：

Dense nanocrystalline BaTiO3 (BT) ceramics with 50 nm average grain size obtained by spark plasma sintering were investigated. The dielectric data showed a ferropara phase transition with a maximum permittivity of 1,602 at 120°C and at 1 kHz. The polarization reversal characteristics were measured, and the typical piezoelectric hysteresis loop was recorded. The asymmetry of permanent polarization and coercive field in polarization-electric field curves were obtained and attributed to the existence of an internal electric field. The present results provide experimental evidence, indicating that if a critical grain size exists for ferroelectricity, then it is less than 50 nm for polycrystalline BT ceramics. © 2007 Higher Education Press and Springer-Verlag.

引用

页码：319 / 321

页数：2

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