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Volume 30 Issue 7
Jul.  2023
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文章导航 >  矿物冶金与材料学报（英文）  > 2023  >  30(7): 1388-1397
Bin Shi, Hongsheng Liang, Zijun Xie, Qing Chang,  and Hongjing Wu, Dielectric loss enhancement induced by the microstructure of CoFe2O4 foam to realize broadband electromagnetic wave absorption, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1388-1397. https://doi.org/10.1007/s12613-023-2599-4
Cite this article as:
Bin Shi, Hongsheng Liang, Zijun Xie, Qing Chang,  and Hongjing Wu, Dielectric loss enhancement induced by the microstructure of CoFe2O4 foam to realize broadband electromagnetic wave absorption, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1388-1397. https://doi.org/10.1007/s12613-023-2599-4
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研究论文

微观结构诱导增强CoFe2O4泡沫的介电损耗实现宽频电磁波吸收

  • 1)

    延安大学化学与化学工程学院, 陕西省化学反应工程重点实验室, 延安 716000, 中国

  • 2)

    西北工业大学物理科学与技术学院, 材料物理与化学教育部重点实验室, 西安 710072, 中国

  • 通讯作者:

    常卿    E-mail: changqingyau@126.com

    吴宏景    E-mail: wuhongjing@nwpu.edu.cn

文章亮点

  • (1) 建立了提高铁氧体复介电常数的微观结构调控策略。
  • (2) 系统地研究了柠檬酸比例对CoFe2O4泡沫微观结构和电磁参数的影响规律。
  • (3) 二维曲面的良好导电性有效提高了CoFe2O4泡沫的复介电常数，三维泡沫结构克服了CoFe2O4的高密度和磁团聚问题。
  • (4) 样品的有效吸收带宽高达7.3 GHz，超过了大多数CoFe2O4基复合吸波材料。
  • 随着5G电子信息时代的到来，各类智能电子设备在方便人们生活的同时也造成了严重的电磁干扰和污染，因此开发高性能的电磁波吸收材料具有重要的现实意义。CoFe2O4铁氧体已被广泛用于电磁波吸收，但其固有的缺点如低介电损耗、高密度和磁团聚等限制了其作为理想吸波材料的应用。本研究提出了一种微观结构调控策略（构建由二维曲面形成的三维泡沫结构）来解决上述难题，采用溶胶-凝胶自蔓延燃烧法合成了CoFe2O4泡沫，通过调节柠檬酸与硝酸铁的摩尔比（0.5、1.0和1.5）来调控CoFe2O4泡沫的微观形貌和电磁参数。二维曲面的良好的导电性可以有效提高CoFe2O4的复介电常数，三维泡沫结构则克服了CoFe2O4纳米颗粒的高密度和磁团聚问题。由于适中的电磁参数产生了良好的阻抗匹配和电导损耗，S0.5的有效吸收带宽高达7.3 GHz，超过了大多数CoFe2O4基吸收材料。S1.5的有效吸收带宽也达到了5.0 GHz（8.9–13.9 GHz），覆盖了X波段的大部分，显示出良好的军事应用潜力，这主要得益于晶格缺陷和异质界面产生的强极化效应。本研究为轻量化宽带纯铁氧体的理论设计和实际生产提供了新的思路。
    • Research Article

    Dielectric loss enhancement induced by the microstructure of CoFe2O4 foam to realize broadband electromagnetic wave absorption

    + Author Affiliations
      Abstract
    • CoFe2O4 has been widely used for electromagnetic wave absorption owing to its high Snoek limit, high anisotropy, and suitable saturation magnetization; however, its inherent shortcomings, including low dielectric loss, high density, and magnetic agglomeration, limit its application as an ideal absorbent. This study investigated a microstructure regulation strategy to mitigate the inherent disadvantages of pristine CoFe2O4 synthesized via a sol–gel auto-combustion method. A series of CoFe2O4 foams (S0.5, S1.0, and S1.5, corresponding to foams with citric acid (CA)-to-Fe(NO3)3·9H2O molar ratios of 0.5, 1.0, and 1.5, respectively) with two-dimensional (2D) curved surfaces were obtained through the adjustment of CA-to-Fe3+ ratio, and the electromagnetic parameters were adjusted through morphology regulation. Owing to the appropriate impedance matching and conductance loss provided by moderate complex permittivity, the effective absorption bandwidth (EAB) of S0.5 was as high as 7.3 GHz, exceeding those of most CoFe2O4-based absorbents. Moreover, the EAB of S1.5 reached 5.0 GHz (8.9–13.9 GHz), covering most of the X band, owing to the intense polarization provided by lattice defects and the heterogeneous interface. The three-dimensional (3D) foam structure circumvented the high density and magnetic agglomeration issues of CoFe2O4 nanoparticles, and the good conductivity of 2D curved surfaces could effectively elevate the complex permittivity to ameliorate the dielectric loss of pure CoFe2O4. This study provides a novel idea for the theoretical design and practical production of lightweight and broadband pure ferrites.
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