A novel and facile route for the in situ formation of composites with dual coupling interactions for considerable millimeter wave absorption performance,Journal of Materials Chemistry C

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A novel and facile route for the in situ formation of composites with dual coupling interactions for considerable millimeter wave absorption performance
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-08-21 , DOI: 10.1039/d1tc03398k
Chuyang Liu ₁ , Tao Jiang ₁ , Tian Gao ₁ , Guangxian Xia ₁ , Yufan Cao ₁ , Gang Fang ₁ , Kangsen Peng ₁ , Yanting Zhang ₁ , Yujing Zhang _{2,

3} , Kongjun Zhu ₁

Affiliation

A hard/soft magnetic exchange coupling or ferroelectric–ferromagnetic coupling has been proved to be beneficial for improving microwave absorption properties. Herein, we propose a BaZr_xFe_12−xO₁₉/Fe₃O₄/BaZrO₃ composite to integrate the advantages of the two couplings. However, the synthesis of BaFe₁₂O₁₉/Fe₃O₄ in situ still remains a challenge due to the different degrees of oxidation resistance. In this work, by delicately exploiting the reducibility of graphene at high temperatures, the BaZr_xFe_12−xO₁₉/Fe₃O₄/BaZrO₃ composite was successfully prepared in situ by a hydrothermal process combined with a subsequent heat treatment at 600 °C. The two integrable couplings provide good impedance matching and attenuation characteristics for the material system, making it reach a considerable millimeter wave absorption performance around an atmospheric window of 35 GHz with a broad bandwidth of >7.36 GHz (32.64–40.00+ GHz) and a strong RL of −25.4 dB under an extremely thin thickness of 1.00 mm. The strategy provides a novel and facile pathway to design outstanding millimeter wave absorbers.

中文翻译：

原位形成具有双耦合相互作用的复合材料的一种新颖而简便的途径，具有相当大的毫米波吸收性能

硬/软磁交换耦合或铁电-铁磁耦合已被证明有利于改善微波吸收特性。在此，我们提出了一种 BaZr _x Fe _{12- x} O ₁₉ /Fe ₃ O ₄ /BaZrO ₃复合材料，以整合两种耦合的优点。然而，由于不同程度的抗氧化性，原位合成BaFe ₁₂ O ₁₉ /Fe ₃ O ₄ 仍然是一个挑战。在这项工作中，通过巧妙地利用石墨烯在高温下的还原性，BaZr _x Fe ₁₂₋_xO ₁₉ /Fe ₃ O ₄ /BaZrO ₃复合材料通过水热法和随后的600℃热处理成功地原位制备。两个可集成耦合为材料系统提供了良好的阻抗匹配和衰减特性，使其在 35 GHz 大气窗口附近达到了相当可观的毫米波吸收性能，具有 >7.36 GHz (32.64–40.00+ GHz) 的宽带宽和强大的在 1.00 mm 的极薄厚度下，RL 为 -25.4 dB。该策略为设计出色的毫米波吸收器提供了一种新颖而简便的途径。

更新日期：2021-09-09

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