Dielectric Properties and Impedance of BaTiO3@Ag Core-shell Composite Ceramic

被引：0

作者：

Ma C. ^{[1
]}

Du H. ^{[1
]}

Liu J. ^{[1
]}

Du X. ^{[1
]}

Yu K. ^{[1
]}

Xi X. ^{[1
]}

Ran H. ^{[1
]}

机构：

[1] College of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2020年 / 48卷 / 09期

关键词：

Barium titanate; Chemical coating method; Core-shell structure; Dielectric properties; Dielectric relaxation;

D O I：

10.14062/j.issn.0454-5648.20200181

中图分类号：

学科分类号：

摘要：

Silver (Ag) was coated on the surface of nano-sized BaTiO3 powder by a chemical coating method, and BaTiO3@Ag composite ceramic was prepared by a solid-state method. The effect of Ag content on the composition, fracture surface microstructure, dielectric properties, and impedance spectroscopy of ceramics were investigated. The results indicate that BaTiO3@Ag composite ceramic is a core-shell structure, and the main phase is a pure perovskite phase. BaTiO3@Ag composite ceramic contains fine and homogeneous grains. The dielectric constant and loss decrease with increasing of Ag content and the δmin is 0.004 87. The curie peaks widen, and the diffusion factor γ increases from 1.08 to 1.42. The thermal stability is improved due to the Ag introduction. The temperature stability coefficient decreases from 0.194 0 to 0.004 8. In addition, the dielectric relaxation of BaTiO3@Ag composite ceramic occurs at 200℃. The conductance activation energy and relaxation activation energy determined by impedance spectroscopy show that the relaxation phenomena occurs due to the short jump of the defective dipoles, which are formed by the conducting electrons generated from the double ionization of the oxygen vacancy and the surrounding ions. © 2020, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：1405 / 1413

页数：8

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