Extrinsic effects on dielectric response of ultrafine grain BaTiO3 ceramics

被引：36

作者：

Zhang, Haitao ^{[1
]}

Deng, Xiangyun ^{[1
,2
]}

Li, Ting ^{[1
]}

Zhang, Wen ^{[1
]}

Chen, Rike ^{[1
]}

Tian, Wenwei ^{[1
]}

Li, Jianbao ^{[1
,3
]}

Wang, Xiaohui ^{[3
]}

Li, Longtu ^{[3
]}

机构：

[1] Hainan Univ, Minist Educ Applicat Technol Chem Mat Hainan Supe, Hainan Prov Key Lab Res Utilizat Si Zr Ti Resourc, Key Lab,Mat & Chem Engn Inst, Haikou 570228, Peoples R China

[2] Tianjin Normal Univ, Coll Phys & Elect Informat, Tianjin 300387, Peoples R China

[3] Tsinghua Univ, Dept Mat Sci & Engn, Beijing 100084, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2010年 / 97卷 / 16期

基金：

中国国家自然科学基金;

关键词：

BARIUM-TITANATE CERAMICS; PERMITTIVITY; CACU3TI4O12;

D O I：

10.1063/1.3505924

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The complex dielectric response of ultrafine grain barium titanate ceramics is investigated using broadband dielectric spectrometer. Extrinsic effects like conduction, space charge associating with grain boundaries are discussed. One dielectric relaxation ascribes to the interaction of defects with grain boundaries, for which the activation energy fitted by Arrhenius equation is equivalent to 0.26 eV and the value shifts to 0.41 eV after annealing treatment. Another relaxation phenomenon locating at elevated temperature can be attributed to interfacial polarization due to space charge accumulation effect. The study of complex impedance spectra suggests that grain boundary effects support extrinsic mechanism. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3505924]

引用

页数：3

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