High-Frequency Negative Permittivity from Fe/Al2O3 Composites with High Metal Contents

被引：44

作者：

Gao, Meng ^{[1
]}

Shi, Zhi-cheng ^{[1
]}

Fan, Run-hua ^{[1
]}

Qian, Lei ^{[1
]}

Zhang, Zi-dong ^{[1
]}

Guo, Jing-yan ^{[1
]}

机构：

[1] Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2012年 / 95卷 / 01期

基金：

中国国家自然科学基金;

关键词：

OPTICAL-PROPERTIES; PERMEABILITY; METAMATERIALS; CO;

D O I：

10.1111/j.1551-2916.2011.04963.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

For conventional metal/ceramic composites, we report an interesting negative permittivity behavior, which was usually observed in artificial metamaterials. The Fe/Al2O3 composites with different Fe volume contents ranging from 10% to 40% were prepared through hot-pressing sintering. The impedance and dielectric properties of the composites in high frequency range present a distinct dependence on the composition, and the negative permittivity is obtained when Fe content exceeds 20 similar to vol%. The experimental results of negative permittivity from the composites above percolation threshold are in good agreement with fitting results from Drude model. The tunability of negative permittivity makes Fe/Al2O3 composites promising candidates for the double negative materials.

引用

页码：67 / 70

页数：4

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