Enhanced extrinsic dielectric response of TiO2 modified CaCu3Ti4O12 ceramics

被引:38
|
作者
Ouyang, Xin [1 ,2 ]
Habib, Mustafa [1 ]
Cao, Peng [1 ]
Wei, Shanghai [1 ]
Huang, Zhaohui [2 ]
Zhang, Weijun [3 ]
Gao, Wei [1 ]
机构
[1] Univ Auckland, Dept Chem & Mat Engn, Auckland 1142, New Zealand
[2] China Univ Geosci, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Natl Lab Mineral Mat, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
[3] Natl Univ Def Technol, Dept Mat Sci & Engn, Changsha 410073, Hunan, Peoples R China
关键词
CaCu3Ti4O12; TiO2; crystallites; Bather layer capacitor; Bimodal grain size distribution; BARRIER-LAYER; VARISTOR PROPERTIES; LEAKAGE CURRENT; CONSTANT; COPPER; CCTO; ORIGIN; PHASE; MODEL; TEMPERATURE;
D O I
10.1016/j.ceramint.2015.07.133
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
TiO2 modified CaCu3Ti4O12 (CCTO) has been synthesized via a facile sol gel precipitation process followed by solid state sintering. The influence of the precipitated TiO2 crystallites on the microstructure, phase composition, and dielectric properties of CCTO has been investigated. The morphology and chemistry of grain boundaries in CCTO ceramics can be significantly tailored by the initial TiO2 crystallites, which results in enhanced bather layer capacitor structures. The formation mechanism of barrier layers based on the instability of Cu ions has been discussed. A new bimodal brick layer mechanism has been proposed to explain the effect of TiO2 modification. The optimized TiO2 modified CCTO sample exhibits stable dielectric permittivity which is twice as high as the unmodified one, and shows relatively low dielectric loss over the frequency range from 10(2) to 10(5) Hz. Such enhancement is deemed to arise from the modified and bimodal internal bather layer capacitor effect. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码:13447 / 13454
页数:8
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