Non-Ohmic and dielectric properties of CaCu3Ti4O12-MgO nanocomposites

被引：24

作者：

Thongbai, Prasit ^{[1
]}

Yamwong, Teerapon ^{[2
]}

Maensiri, Santi ^{[3
]}

机构：

[1] Khon Kaen Univ, Dept Phys, INRC, Khon Kaen 40002, Thailand

[2] Natl Met & Mat Technol Ctr MTEC, Pathum Thani 12120, Thailand

[3] Suranaree Univ, Inst Sci, Sch Phys, Nakhon Ratchasima 30000, Thailand

来源：

MICROELECTRONIC ENGINEERING | 2013年 / 108卷

关键词：

CaCu3Ti4O12; Dielectric properties; Microstructure; Ceramics; Grain boundary; CALCIUM COPPER TITANATE; CERAMICS; BEHAVIOR; MICROSTRUCTURES; PERMITTIVITY; RELAXATION; CONSTANTS; EVOLUTION; BARRIER;

D O I：

10.1016/j.mee.2013.01.050

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this work, CaCu3Ti4O12-xMgO (x = 0, 5, and 10 vol.%) nanocomposites were prepared by a conventional mixed oxide method using CaCu3Ti4O12 and MgO nanopowders with particles sizes of about 100-300 nm and 36-50 nm, respectively. The dielectric and electrical properties of CaCu3Ti4O12 and CaCu3Ti4O12/MgO ceramics were investigated. The results revealed that addition of 5 vol.% MgO can improve both dielectric and electrical nonlinear properties. The low-frequency loss tangent was greatly reduced; while, the dielectric constant was found to be higher than 10(4) in the frequency range of 10(2)-10(5) Hz. The decrease in a low-frequency loss tangent is caused by a decrease in DC conductivity. Addition of 5 vol.% MgO can also enhance significantly the breakdown voltage and nonlinear coefficient of CaCu3Ti4O12 ceramic. Using impedance spectroscopy analysis, the increase in the breakdown voltage is attributed to an increase in the resistance of grain boundaries. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：177 / 181

页数：5

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