Magnetic-dielectric component modulation and heterogeneous interface engineering have been acknowledged as a highly potent strategy for the effective development of lightweight and broad-spectrum electromagnetic wave (EMW) absorbers. In this investigation, a series of carbon-based Ce/Fe-MOF derivatives were successfully synthesized via the carbonization process of Ce/Fe-MOF precursors. The EMW absorption characteristics of these derivatives were investigated by manipulating the metal ion ratio and the pyrolysis temperature. Notably, the Ce/Fe-MOF-700 composite, derived from the calcination of Ce/Fe-MOF with a molar ratio of Ce/Fe of 1:2 at 700 °C, demonstrated an impressive minimum reflection loss value of −44.6 dB at 1.38 mm. Furthermore, it exhibited an efficient absorbing bandwidth (EAB) of 6.88 GHz at a thinner coating thickness ranging from 1.38 to 1.8 mm. This remarkable ability of these materials to attenuate EMW can be ascribed to the heightened conductivity dissipation, polarization dissipation, magnetic dissipation, and enhanced impedance matching achieved by these materials. The findings of this study provide a novel point of reference for the design of lightweight and broad-spectrum EMW absorbing materials.

中文翻译：

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可控合成具有改善微波吸收性能的CeFeO3/Fe+2Fe2+3O4/C复合材料

磁介电元件调制和异质界面工程已被公认为是有效开发轻质广谱电磁波（EMW）吸收器的高效策略。在这项研究中，通过Ce/Fe-MOF前驱体的碳化过程成功合成了一系列碳基Ce/Fe-MOF衍生物。通过控制金属离子比例和热解温度研究了这些衍生物的电磁波吸收特性。值得注意的是，Ce/Fe-MOF-700 复合材料是由 Ce/Fe 摩尔比为 1:2 在 700 °C 下煅烧得到的 Ce/Fe-MOF-700 复合材料，表现出令人印象深刻的最小反射损耗值 -44.6 dB 1.38 毫米。此外，它在 1.38 至 1.8 mm 的较薄涂层厚度下表现出 6.88 GHz 的有效吸收带宽 (EAB)。这些材料衰减 EMW 的卓越能力可归因于这些材料实现的更高的电导率耗散、极化耗散、磁耗散和增强的阻抗匹配。这项研究的结果为轻质广谱电磁波吸收材料的设计提供了新的参考点。