The tunable negative permittivity and negative permeability of percolative Fe/Al2O3 composites in radio frequency range
The tunable negative permittivity and negative permeability of percolative Fe/Al2O3 composites in radio frequency range
复制标题
渗流Fe/Al2O3复合材料在射频范围内可调负介电常数和负磁导率
DOI：
10.1063/1.4918998
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发表时间：
2015-04
影响因子：
4
通讯作者：
S.B.Pan
中科院分区：
文献类型：
--
作者：
X.H.Zhang;P.T.Xie;M.X.Yu;S.B.Pan
研究了Fe/Al_2O_3复合材料的交流电导率、介电常数和磁导率等电磁性能
复合材料，这是通过原位合成工艺制备的，在射频范围内进行了研究。随着铁含量的增加，存在明显的渗流转变。当铁含量超过逾渗阈值但接近逾渗阈值时，样品FA 30在631 MHz ~ 1 GHz范围内同时获得负介电常数和负磁导率。进一步增加铁含量，观察到类Fano共振，并且介电常数从负到正变化的共振频率向低频移动。此外，负介电常数和负磁导率的频率区域不再重叠。Fe/Al_2O_3复合氧化物
具有可调负介电常数和负磁导率的复合材料可用作电磁波吸收体。
The electromagnetic properties including ac conductivity, permittivity, and permeability of percolative Fe/Al2O3
composites, which were prepared by in-situ synthesis process, are investigated in the radio frequency range. There is an obvious percolation transition with the increase of iron contents. When iron content is beyond but near the percolation threshold, the negative permittivity and permeability are simultaneously obtained from 631 MHz to 1 GHz in sample FA30. Further increasing iron content, the Fano-like resonances are observed, and the resonance frequency where the permittivity changes from negative to positive shifts to lower frequency. In addition, the frequency region of negative permittivity and negative permeability are not overlapped any more. Hopefully, the percolative Fe/Al2O3
composites with tunable negative permittivity and negative permeability can be used as electromagnetic wave absorber.
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