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Electromagnetic wave absorption and dielectric-modulation of metallic perovskite lanthanum nickel oxide

机译：金属钙钛矿镍镍氧化物的电磁波吸收和电介质调制

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摘要

Electromagnetic (EM) wave absorption properties of metallic perovskite lanthanum nickel oxide (LNO) powder and dielectric-modulated LNO-FeCo/C composites were investigated. Reflection loss (RL) of the LNO-paraffin composites depends on the mass ratio of LNO powder dispersion in the paraffin matrix, in which the optimal RL of -24.7 dB at 17.6 GHz with the absorbent layer thickness of 1.6 mm is obtained at the 10 wt% LNO-paraffin composite, just below the percolation threshold (PC) of the LNO dispersion in the paraffin matrix. Three absorption peaks in the frequency dependence of RL of the 10 wt% LNO-paraffin composite are ascribed to the dielectric relaxations which occurred at frequencies of about 3.3, 9.2 and 15.1 GHz. Dielectric-modulation by metal-conductive LNO powder significantly increases the relative complex permittivity of the (x) LNO-(y) FeCo/C-paraffin composites and a good impedance match coming from the dielectric-modulation by the LNO powder would be obtained just below the PC of the LNO powder dispersion in the paraffin matrix. The (8 wt%) LNO-(32 wt%) FeCo/C-paraffin composite exhibited an enhanced EM wave absorption performance, in which RL values less than -20 dB can be obtained in the 2-18 GHz range by choosing an appropriate thickness from 1.3 mm to 8 mm and the minimum RL is 50.6 dB at 9 GHz with the absorbent layer thickness of 2.4 mm.
机译：研究了金属钙钛矿镧镍（LNO）粉末和电介质调制的LNO-FECO / C复合材料的电磁（EM）波吸收性能。 LNO-石蜡复合材料的反射损失（RL）取决于石蜡基质中的LNO粉末分散体的质量比，其中在10中获得17.6GHz的17.6GHz的最佳RL为1.6mm。 WT％LNO-石蜡复合材料，正低于石蜡基质中的LNO分散体的渗透阈值（PC）。在10重量％的LNO-石蜡复合的RL的频率依赖性三个吸收峰归因于发生在约3.3，9.2和15.1千兆赫的频率下的介电弛豫。通过金属导电LNO粉末的介电调节显着增加了（x）LNO-（Y）FeCo / C-石蜡复合材料的相对复杂介电常数，并且可以获得来自LNO粉末的电介质调制的良好阻抗匹配在石蜡基质中的LNO粉末分散的PC下方。 （8wt％）LNO-（32wt％）FECO / C-石蜡复合材料表现出增强的EM波吸收性能，其中通过选择合适的情况，可以在2-18GHz范围内获得小于-20dB的RL值厚度为1.3毫米至8mm，最小RL为50.6dB，9GHz，吸收层厚度为2.4mm。

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  • 来源
    《RSC Advances》 |2015年第19期|共8页
  • 作者

    Jiang J. J.; Li D.; Li S. J.; Wang Z. H.; Wang Y.; He J.; Liu W.; Zhang Z. D.;

  • 作者单位

    Chinese Acad Sci Shenyang Natl Lab Mat Sci Inst Met Res Shenyang 110016 Peoples R China;

    Chinese Acad Sci Shenyang Natl Lab Mat Sci Inst Met Res Shenyang 110016 Peoples R China;

    Chinese Acad Sci Shenyang Natl Lab Mat Sci Inst Met Res Shenyang 110016 Peoples R China;

    Chinese Acad Sci Shenyang Natl Lab Mat Sci Inst Met Res Shenyang 110016 Peoples R China;

    Cent Iron &

    Steel Res Inst Div Funct Mat Beijing 100081 Peoples R China;

    Cent Iron &

    Steel Res Inst Div Funct Mat Beijing 100081 Peoples R China;

    Chinese Acad Sci Shenyang Natl Lab Mat Sci Inst Met Res Shenyang 110016 Peoples R China;

    Chinese Acad Sci Shenyang Natl Lab Mat Sci Inst Met Res Shenyang 110016 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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