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首页> 外文期刊>RSC Advances >Percolative silver/alumina composites with radio frequency dielectric resonance-induced negative permittivity
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Percolative silver/alumina composites with radio frequency dielectric resonance-induced negative permittivity

机译：具有射频介电共振引起的负介电常数的渗透性银/氧化铝复合材料

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The percolation phenomenon has great significance for multi-component materials, especially for the preparation of high-k composites. At present, most research focuses on composites below the percolation threshold because the high filling fraction usually results in enhanced losses, which are undesirable for high-k applications. However, it should be noted that lossy materials also may have huge potential applications in microwave absorbing, electromagnetic attenuation and shielding fields, etc. Therefore, it is of interest to clarify the dielectric behaviors of composites beyond percolation. Herein, the dielectric properties of silver/alumina composites beyond percolation are investigated. Interestingly, metal-insulator transition, capacitive-inductive transition, and radio frequency dielectric resonances appear along with the percolation phenomenon. The interrelationships between these phenomena are discussed. The mechanism of the radio frequency dielectric resonance-induced negative permittivity is discussed in detail. Clarification of the dielectric properties of conductor/insulator composites beyond percolation has great significance for the development of novel dielectric materials with fascinating properties and applications.
机译：渗流现象对多组分材料具有重要意义，特别是对于高k复合材料的制备。目前，大多数研究集中在渗透阈值以下的复合材料上，因为高填充率通常会导致损耗增加，这对于高k应用而言是不希望的。但是，应该指出的是，有损耗材料在微波吸收，电磁衰减和屏蔽领域等方面也可能具有巨大的潜在应用。因此，有必要弄清楚复合材料的介电行为，而不是渗透。在此，研究了超过渗滤的银/氧化铝复合材料的介电性能。有趣的是，金属-绝缘体跃迁，电容-电感跃迁和射频介电共振与渗透现象一起出现。讨论了这些现象之间的相互关系。详细讨论了射频介电共振引起的负介电常数的机制。超越渗滤，澄清导体/绝缘体复合材料的介电性能对于开发具有令人着迷的性能和应用的新型介电材料具有重要意义。

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