Negative permittivity behavior in Fe50Ni50/Al2O3 magnetic composite near percolation threshold
Negative permittivity behavior in Fe50Ni50/Al2O3 magnetic composite near percolation threshold
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Fe50Ni50/Al2O3 磁性复合材料在逾渗阈值附近的负介电常数行为
DOI：
10.1016/j.jmmm.2014.12.067
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发表时间：
2015-05
影响因子：
2.7
通讯作者：
Zi-dong Zhang
中科院分区：
文献类型：
--
作者：
Meng Gao;Shi-bing Pan;Ming-xun Yu;Zi-dong Zhang
导体-绝缘体复合材料的物理性质通常在渗透阈值（fc）附近发生剧烈变化，导致有趣的应用，例如双负材料。这种现象也会因增加本构相性质之间的差异而扩大。本文采用热压烧结法制备了Fe50Ni50体积含量（10%、20%、30%、40%）不同的Fe50Ni50/ al2o3磁性陶瓷。研究了Fe50Ni50/ al2o3复合材料在射频范围内的介电常数。结果表明：当Fe50Ni50含量低于fc时，复合材料的电抗为负值，表现为电容性；金属Fe50Ni50颗粒被隔离在绝缘陶瓷基体中，导致类似绝缘体的介电性能。当Fe50Ni50的体积分数达到40%以上时，复合材料表现出电感特性。在这种情况下，由于渗透现象，Fe50Ni50/ al2o3复合材料在整个测试频率范围内获得了负介电常数，这使得Fe50Ni50/ al2o3复合材料成为有希望的双负材料候选材料。
The physical properties of conductor–insulator composites often take dramatic changes near the percolation threshold (fc), leading to interesting applications, such as double negative material. This phenomenon also will be enlarged by increasing the differences between the properties of the constitutive phases. In this paper, the Fe50Ni50/Al2O3magnetic cermets with different Fe50Ni50 volume contents (10%, 20%, 30%, 40%) were prepared via hot-pressing sintering. The permittivity of Fe50Ni50/Al2O3composites has been studied in the radio frequency range. The results indicate that when the Fe50Ni50 content is belowfc, the reactance of the composites takes a negative value, which indicates a capacitive character. The metallic Fe50Ni50 grains are isolated in the insulating ceramic matrix, leading to an insulator-like dielectric property. When the volume fraction of Fe50Ni50 reaches 40% which is abovefc, the composites manifest an inductive character. In this case, the negative permittivity has been obtained over the whole test frequency range due to the percolation phenomenon, which makes Fe50Ni50/Al2O3composites as promising candidates for double negative materials.
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