ABSTRACT The development of new radar-absorbing structures (RASs) with strong microwave absorption, fine thickness and adequate structural performance is imperative. Herein, nanocrystalline Ni0.5Zn0.5Fe2O4 was synthesised by a facile and effective sol–gel autocombustion technique. The structural and magnetic properties of ferrite were determined by various characterisation techniques, and E-glass/epoxy-based nanocomposites with different weight percentages of ferrite were fabricated by in-situ polymerisation. Further, electromagnetic properties were investigated to elucidate the possible absorption mechanism of the fabricated structures. The 4-mm-thick double-layered E-glass/epoxy/nickel–zinc ferrite composites exhibited reflection loss (RL) of <−10 dB for a bandwidth of 2.4 GHz and a maximum RL of −33 dB at 9.6 GHz. This performance was attributed to the larger magnetic loss and sufficient matching of electromagnetic parameters. This study provides a unique insight into the utilisation of Ni0.5Zn0.5Fe2O4 for producing lightweight and relatively thin RASs in the X-band at a low cost.

中文翻译：

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用于雷达吸收结构的 Ni0.5Zn0.5Fe2O4 增强 E 玻璃/环氧树脂纳米复合材料的合成

摘要 开发具有强微波吸收、薄厚度和足够结构性能的新型吸波结构（RAS）势在必行。在此，纳米晶 Ni0.5Zn0.5Fe2O4 是通过一种简便有效的溶胶-凝胶自燃技术合成的。通过各种表征技术确定铁氧体的结构和磁性能，并通过原位聚合制备具有不同重量百分比铁氧体的无碱玻璃/环氧树脂基纳米复合材料。此外，研究了电磁特性以阐明制造结构的可能吸收机制。4 毫米厚的双层 E 玻璃/环氧树脂/镍-锌铁氧体复合材料在 2.4 GHz 带宽下表现出 <-10 dB 的反射损耗 (RL)，在 9.6 GHz 下最大 RL 为 -33 dB。这种性能归因于较大的磁损耗和电磁参数的充分匹配。这项研究为利用 Ni0.5Zn0.5Fe2O4 以低成本生产轻量且相对较薄的 X 波段 RAS 提供了独特的见解。