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<p>LaFeO<sub>3</sub> (LFO) perovskite exhibits excellent wave-absorbing properties, but it also has certain inherent defects, including high specific gravity, high filling ratio, and poor corrosion resistance. This study aims to prepare a composite material by coating C-balls with LaFeO<sub>3</sub>, with the objective of investigating the microwave absorption properties of LFO-based composites. In this work, we have fabricated LaFeO<sub>3</sub>C<sub><i>x</i></sub> (<i>x</i> = 0.5, 0.7, 0.9, 1.1) composites via a facile and effective hydrothermal approach. The influence of the encapsulated carbon on the phase structure, morphology, and electromagnetic parameters was investigated by x-ray diffraction (XRD), scanning electron microscopy (SEM), and vector network analysis, respectively. The results show that the synergistic effect of attenuation constant and impedance matching improves the microwave absorption properties of the composites. The LaFeO<sub>3</sub>C<sub>0.9</sub> exhibited favorable microwave absorption performance, with a minimum reflection loss (RL<sub>min</sub>) of −29.21 dB at 13.20 GHz, and revealed that a frequency bandwidth of 4.40 GHz (RL ≤ −10 dB) could be achieved at 2.0 mm. In addition, CST Studio Suite simulations showed that LaFeO<sub>3</sub>C<sub>0.9</sub> significantly reduces the radar cross section (RCS) value by 28.11 dB m<sup>2</sup>. This indicates that such composites have superior absorption performance and could be very useful in the field of microwave absorption.</p>

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Facile and Effective Carbon-Coating Strategy for Synthesizing LFO@C Composites and Enhancing Microwave Absorption Performance

  • 期刊论文

  • 发表日期：

    2025年3月19日

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  • Fengfei Lu,
  • Lei Huang,
  • Ye Liu,
  • Zhenchun Li,
  • Qingrong Yao,
  • Ya Gu,
  • Lichun Cheng

摘要

LaFeO3 (LFO) perovskite exhibits excellent wave-absorbing properties, but it also has certain inherent defects, including high specific gravity, high filling ratio, and poor corrosion resistance. This study aims to prepare a composite material by coating C-balls with LaFeO3, with the objective of investigating the microwave absorption properties of LFO-based composites. In this work, we have fabricated LaFeO3Cx (x = 0.5, 0.7, 0.9, 1.1) composites via a facile and effective hydrothermal approach. The influence of the encapsulated carbon on the phase structure, morphology, and electromagnetic parameters was investigated by x-ray diffraction (XRD), scanning electron microscopy (SEM), and vector network analysis, respectively. The results show that the synergistic effect of attenuation constant and impedance matching improves the microwave absorption properties of the composites. The LaFeO3C0.9 exhibited favorable microwave absorption performance, with a minimum reflection loss (RLmin) of −29.21 dB at 13.20 GHz, and revealed that a frequency bandwidth of 4.40 GHz (RL ≤ −10 dB) could be achieved at 2.0 mm. In addition, CST Studio Suite simulations showed that LaFeO3C0.9 significantly reduces the radar cross section (RCS) value by 28.11 dB m2. This indicates that such composites have superior absorption performance and could be very useful in the field of microwave absorption.