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<p>La<sub>1-<i>x</i></sub>Sr<sub><i>x</i></sub>Co<sub>0.9</sub>Fe<sub>0.1</sub>O<sub>3</sub> (<i>x</i> = 0, 0.1, 0.15, 0.2) perovskite oxides were successfully synthesized by the sol–gel method, with Sr<sup>2</sup>⁺ doping at the A-site and Fe<sup>3+</sup> at B-site of LaCoO<sub>3</sub>. The effect of AB-site co-doping on the structure, morphology, electromagnetic parameters, and microwave absorption properties was systematically investigated. The optimal composition La<sub>0.85</sub>Sr<sub>0.15</sub>Co<sub>0.9</sub>Fe<sub>0.1</sub>O<sub>3</sub> achieved a minimum reflection loss of −42.79&#xa0;dB at 1.5&#xa0;mm thickness and an effective absorption bandwidth of 5.44&#xa0;GHz (11.92–17.36&#xa0;GHz) at 1.8&#xa0;mm. This remarkable performance arises not only from the presence of defects and the enhanced polarization loss due to oxygen vacancies induced by Sr<sup>2+</sup> and Fe<sup>3+</sup> co-doping, but also from synergistic effects including multiple reflections and scattering from the porous microstructure, interfacial polarization, and magnetic loss mechanisms. These results demonstrate that simultaneous A-site and B-site doping is an effective strategy to achieve thin, broadband, and high-performance microwave absorbers, highlighting a promising route for the development of perovskite-based EM wave absorption materials.</p>

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Effect of AB-site co-doping on the electromagnetic wave absorption properties and mechanism of LaCoO3 perovskite oxides

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Man Yu,
  • Yingying Zhou,
  • Chaoqun Yang,
  • Yuanyuan Lu,
  • Xiaojuan Zhao,
  • Zhen Gong,
  • Xiangning Kong,
  • Hui Xie

摘要

La1-xSrxCo0.9Fe0.1O3 (x = 0, 0.1, 0.15, 0.2) perovskite oxides were successfully synthesized by the sol–gel method, with Sr2⁺ doping at the A-site and Fe3+ at B-site of LaCoO3. The effect of AB-site co-doping on the structure, morphology, electromagnetic parameters, and microwave absorption properties was systematically investigated. The optimal composition La0.85Sr0.15Co0.9Fe0.1O3 achieved a minimum reflection loss of −42.79 dB at 1.5 mm thickness and an effective absorption bandwidth of 5.44 GHz (11.92–17.36 GHz) at 1.8 mm. This remarkable performance arises not only from the presence of defects and the enhanced polarization loss due to oxygen vacancies induced by Sr2+ and Fe3+ co-doping, but also from synergistic effects including multiple reflections and scattering from the porous microstructure, interfacial polarization, and magnetic loss mechanisms. These results demonstrate that simultaneous A-site and B-site doping is an effective strategy to achieve thin, broadband, and high-performance microwave absorbers, highlighting a promising route for the development of perovskite-based EM wave absorption materials.