Quantitative Evaluation of Loss Capability for In Situ  Conductive Phase Enhanced Microwave Absorption of High-Entropy Transition Metal Oxides

Guohao Dai; Ruixiang Deng; Tao ZhangYun YuLixin Song

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Quantitative Evaluation of Loss Capability for In Situ Conductive Phase Enhanced Microwave Absorption of High-Entropy Transition Metal Oxides

机译：Quantitative Evaluation of Loss Capability for In Situ Conductive Phase Enhanced Microwave Absorption of High-Entropy Transition Metal Oxides

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High-entropy oxides (HEO) with high stability and designability are potentialmicrowave absorbers that serve in harsh environments. However, loss designis critical for the absorption performance of HEO due to its weak intrinsicloss capability. Inadequate loss ability results in considerable secondaryreflection. Here, an in situ conductive heterogeneous phase is constructedin (Fe_(0.2x)Co_(0.2)Ni_(0.2)Cr_(0.2)Mn_(0.2))_3O_4 (x = 1–5) using a reductive circumstance,to form a dual-phase composite. Both the ohmic and dielectric loss areenhanced as the conductive phase is introduced, while great impedancematching condition is well maintained. Hence, the composites can achievesubstantial absorption across the whole X or Ku band with a thin thickness.Furthermore, key efforts are made to reveal the relationship between theabsorbing performance and loss capability of an absorber. The analyticalexpression of the theoretical threshold of attenuation constant is derived.Based on the statistics of experimental data, the broad feasibility and practicabilityof the proposed theoretical threshold of attenuation constant areconfirmed and discussed. Combined with both the theoretical and experimentalstudies, the mechanism by which the conductive phase contributesto increased absorption is also disclosed, providing an effective basis for theloss design of broadband microwave absorbers.

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来源
《Advanced functional materials》 |2022年第35期|2205325.1-2205325.12|共12页
作者
Guohao Dai; Ruixiang Deng; Tao ZhangYun YuLixin Song;
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作者单位

Key Laboratory of Inorganic Coating Materials CASShanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050, P. R. China;

Key Laboratory of Inorganic Coating Materials CASShanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050, P. R. China School of Chemistry and Materials ScienceHangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesH;

Key Laboratory of Inorganic Coating Materials CASShanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050, P. R. China School of Physical Science and TechnologyShanghaiTech UniversityShanghai 201210, P. R. China;

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microwave absorbers; theoretical design; loss capability; high-entropy oxides; in-situ heterogeneous phases;

Quantitative Evaluation of Loss Capability for In Situ Conductive Phase Enhanced Microwave Absorption of High-Entropy Transition Metal Oxides

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