Sintering Effects on Dielectric Properties of Zn-Doped CaCu3Ti4O12 Ceramic Synthesized by Modified Sol-Gel Route

被引：15
作者：
Singh, Laxman [1 ]
Rai, U. S. [1 ]
Rai, Alok Kumar [2 ]
Mandal, K. D. [3 ]
机构：
[1] Banaras Hindu Univ, Fac Sci, Dept Chem, Varanasi 221005, Uttar Pradesh, India
[2] Chonnam Natl Univ, Dept Mat Sci & Engn, Kwangju 500757, South Korea
[3] BHU, Indian Inst Technol, Dept Appl Chem, Varanasi 221005, Uttar Pradesh, India
来源：
ELECTRONIC MATERIALS LETTERS | 2013年 / 9卷 / 01期
关键词：
sintering; grain size; dielectric properties; perovskites; capacitors; CONSTANT; PURE;
D O I：
10.1007/s13391-012-2095-x
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
CaCu2.90Zn0.10Ti4O12 ceramic was synthesized by a novel semi-wet route and calcined at 800 degrees C in air for 8 h. The obtained powder was divided into three parts and sintered in air at 950 degrees 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 epsilon(r) similar to 5971 at 1 kHz and room temperature. It is found that epsilon(r) is independent at high frequency and weakly dependent on temperature.
引用
收藏
页码：107 / 113
页数：7
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