Sintering effects on dielectric properties of Zn-doped CaCu3Ti4O12 ceramic synthesized by modified sol-gel route

被引：0
|
作者：
Laxman Singh
U. S. Rai
Alok Kumar Rai
K. D. Mandal
机构：
[1] Banaras Hindu University,Department of Chemistry, Faculty of Science
[2] Chonnam National University,Department of Materials Science and Engineering
[3] Indian Institute of Technology,Department of Applied Chemistry
[4] BHU,undefined
来源：
Electronic Materials Letters | 2013年 / 9卷
关键词：
sintering; grain size; dielectric properties; perovskites; capacitors;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
CaCu2.90Zn0.10Ti4O12 ceramic was synthesized by a novel semi-wet route and calcined at 800°C in air for 8 h. The obtained powder was divided into three parts and sintered in air at 950°C for 6 h, 8 h, and 12 h, separately. XRD results confirmed the single phase formation of all the sintered samples with similar cubic structure of CaCu3Ti4O12 (CCTO). Scanning electron micrographs of the CaCu2.9Zn0.1Ti4O12 ceramic sintered for 6 h shows bimodal grain size distribution. Increasing the sintering time significantly promotes the grain growth and microstructural densification. The sintering duration was found to have tremendous influence on microstructure and dielectric properties of CaCu2.90Zn0.10Ti4O12 ceramic. The CaCu2.9Zn0.1Ti4O12 ceramic sintered for 12 h exhibited high dielectric constant εr ∼ 5971 at 1 kHz and room temperature. It is found that εr is independent at high frequency and weakly dependent on temperature.
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页码：107 / 113
页数：6
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