Effects of silica coating on the microstructures and energy storage properties of BaTiO3 ceramics

被引：87

作者：

Zhang, Yiming ^{[1
]}

Cao, Minghe ^{[1
]}

Yao, Zhonghua ^{[1
]}

Wang, Zhijian ^{[1
]}

Song, Zhe ^{[1
]}

Ullah, Atta ^{[1
]}

Hao, Hua ^{[1
]}

Liu, Hanxing ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

来源：

MATERIALS RESEARCH BULLETIN | 2015年 / 67卷

关键词：

Ceramics; Dielectric properties; Electrical properties; Energy storage; BARIUM STRONTIUM-TITANATE; BREAKDOWN STRENGTH; STOBER PROCESS; GRAIN-SIZE; DENSITY; NANOPARTICLES; POLYMER; SPHERES;

D O I：

10.1016/j.materresbull.2015.01.056

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigated microstructures and energy storage properties of SiO2-coated BaTiO3 ceramics that were prepared by the so-called Stober process. The thickness of coating layer of BaTiO3 powders could be effectively controlled by the silica content. It could be observed that the secondary phases Ba2TiSi2O8 appeared in the coated BaTiO3 ceramics due to the interdiffusion reactions between SiO2 and BaTiO3 components under sintering. BaTiO3 cores in the coated ceramics remained up to the original grain size indicating the coating layer as an inhibitor. The results showed that both breakdown strength and energy density were improved apparently. The homogeneity of silica coating in the ceramics should dominate contribution to breakdown strength, which can reduce the weak-point breakdown under high electric field. The optimized composition for BaTiO3 ceramic coated with 2.0 wt% SiO2 showed the maximum energy storage density of 1.2 J/cm(3) with energy storage efficiency of 53.8%, which is about three times higher than that of pure BaTiO3 (0.37 J/cm(3)). (C) 2015 Published by Elsevier Ltd.

引用

页码：70 / 76

页数：7

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