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<p>High-entropy multiphase (Fe<sub>0.2</sub>Co<sub>0.2</sub>Ni<sub>0.2</sub>Cu<sub>0.2</sub>Mg<sub>0.2</sub>) Al<sub>2</sub>O<sub>4</sub> ceramics were successfully fabricated using a solid-state reaction route. The phase constitution, microstructure, and microwave absorption performance were systematically characterized, with particular attention devoted to the influence of sintering temperature on microwave absorption behavior. Optimal microwave absorption was achieved at a matching thickness of 6.2&#xa0;mm, within the C-band frequency range, where the minimum reflection loss reached − 41.20&#xa0;dB at 4.72&#xa0;GHz, accompanied by an effective absorption bandwidth (RL ≤ − 10&#xa0;dB) of 1.6&#xa0;GHz. The optimal performance is associated with a balance between defect-induced polarization and heterogeneous interfacial effects (spinel/Ni<sub>3</sub>Fe), which collectively improve impedance matching and attenuation capability.</p>

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Microstructure and C-band electromagnetic properties of (Fe0.2Co0.2Ni0.2Cu0.2Mg0.2) Al2O4 high-entropy ceramics for microwave absorption

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Haoran Chen,
  • Wenhu Yang,
  • Haojie Zhang,
  • Zhiyong Chen,
  • Mingjun Zheng

摘要

High-entropy multiphase (Fe0.2Co0.2Ni0.2Cu0.2Mg0.2) Al2O4 ceramics were successfully fabricated using a solid-state reaction route. The phase constitution, microstructure, and microwave absorption performance were systematically characterized, with particular attention devoted to the influence of sintering temperature on microwave absorption behavior. Optimal microwave absorption was achieved at a matching thickness of 6.2 mm, within the C-band frequency range, where the minimum reflection loss reached − 41.20 dB at 4.72 GHz, accompanied by an effective absorption bandwidth (RL ≤ − 10 dB) of 1.6 GHz. The optimal performance is associated with a balance between defect-induced polarization and heterogeneous interfacial effects (spinel/Ni3Fe), which collectively improve impedance matching and attenuation capability.