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<p>The rapid development of information technology has put forward higher requirements for high-frequency electromagnetic materials, especially in the microwave absorption field, which can protect devices and humans from electromagnetic radiation. In this work, Nd<sub>2</sub>Fe<sub>17</sub>C<sub><i>x</i></sub> compounds are synthesized by introducing carbon (C) atoms in Nd<sub>2</sub>Fe<sub>17</sub>. It is found that the addition of C remarkably improves the magnetic and electromagnetic parameters in comparison with Nd<sub>2</sub>Fe<sub>17</sub>. Firstly, the C-introduction increases the saturation magnetization (<i>M</i><sub>S</sub>), which would originate from the magneto-volume effect and further enhances the permeability of compounds. The higher values of real permeability benefit impedance matching and the enhanced imaginary permeability signifies strengthened magnetic loss capability. Besides, the impedance matching and attenuation capability of these compounds are obviously improved, which therefore endow them with excellent high-frequency microwave absorption performance. With a thickness of 2.3&#xa0;mm, the Nd<sub>2</sub>Fe<sub>17</sub>C<sub>0.55</sub> composite exhibits the minimum reflection loss of −42.29&#xa0;dB, and the Nd<sub>2</sub>Fe<sub>17</sub>C<sub>0.34</sub> composite presents the maximum effective absorption bandwidth of 4.46&#xa0;GHz at only 1.4&#xa0;mm. This work reveals an effective method to control electromagnetic parameters in rare-earth-Fe-based compounds for better microwave absorption performance at high frequencies.</p>

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Enhancement of microwave absorption performance in carbon-modified Nd2Fe17 compounds

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Ruiqi Wang,
  • Wei Li,
  • Yangjun Zou,
  • Changcheng Huang,
  • Zhishuo Zhang,
  • Shengcan Ma

摘要

The rapid development of information technology has put forward higher requirements for high-frequency electromagnetic materials, especially in the microwave absorption field, which can protect devices and humans from electromagnetic radiation. In this work, Nd2Fe17Cx compounds are synthesized by introducing carbon (C) atoms in Nd2Fe17. It is found that the addition of C remarkably improves the magnetic and electromagnetic parameters in comparison with Nd2Fe17. Firstly, the C-introduction increases the saturation magnetization (MS), which would originate from the magneto-volume effect and further enhances the permeability of compounds. The higher values of real permeability benefit impedance matching and the enhanced imaginary permeability signifies strengthened magnetic loss capability. Besides, the impedance matching and attenuation capability of these compounds are obviously improved, which therefore endow them with excellent high-frequency microwave absorption performance. With a thickness of 2.3 mm, the Nd2Fe17C0.55 composite exhibits the minimum reflection loss of −42.29 dB, and the Nd2Fe17C0.34 composite presents the maximum effective absorption bandwidth of 4.46 GHz at only 1.4 mm. This work reveals an effective method to control electromagnetic parameters in rare-earth-Fe-based compounds for better microwave absorption performance at high frequencies.