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<p>The issue of electromagnetic interference caused by low-frequency communication devices is becoming increasingly severe. To address this challenge, we prepared fumed silica-loaded nickel-zinc ferrite composites. The composites were synthesized via a sol–gel method. The structure, morphology, and electromagnetic wave absorption properties of samples with varying ratios of fumed silica (FS) to nickel-zinc ferrite (Ni<sub>0.5</sub>Zn<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub>) were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and a vector network analyzer (VNA). The results indicate that the incorporation of fumed silica broadens the absorption bandwidth in the low-frequency range (2–6&#xa0;GHz). The reflection loss of pure nickel-zinc ferrite reached –20.55&#xa0;dB at 7.56&#xa0;GHz, while the FS/Ni<sub>0.5</sub>Zn<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> composite achieved a superior reflection loss of –22.46&#xa0;dB at the same frequency, demonstrating the beneficial effect of fumed silica addition.</p>

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Preparation and wave-absorbing properties of Ni0.5Zn0.5Fe2O4—fumed silica absorbers

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Liu Runqing,
  • Hou Xianfeng,
  • Yang Yuanquan

摘要

The issue of electromagnetic interference caused by low-frequency communication devices is becoming increasingly severe. To address this challenge, we prepared fumed silica-loaded nickel-zinc ferrite composites. The composites were synthesized via a sol–gel method. The structure, morphology, and electromagnetic wave absorption properties of samples with varying ratios of fumed silica (FS) to nickel-zinc ferrite (Ni0.5Zn0.5Fe2O4) were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and a vector network analyzer (VNA). The results indicate that the incorporation of fumed silica broadens the absorption bandwidth in the low-frequency range (2–6 GHz). The reflection loss of pure nickel-zinc ferrite reached –20.55 dB at 7.56 GHz, while the FS/Ni0.5Zn0.5Fe2O4 composite achieved a superior reflection loss of –22.46 dB at the same frequency, demonstrating the beneficial effect of fumed silica addition.