多介电弛豫与多磁共振诱导的非晶FeSiBCr薄片双纳米晶相实现强宽带微波吸收

doi:10.1016/j.actphy.2026.100331

摘要/Abstract

摘要：

非晶材料的阻抗匹配与损耗能力平衡仍是获得优异微波吸收性能的重大挑战。本研究通过在FeSiBCr薄片中构建FeNi和α-Fe双纳米晶相，增强损耗能力并优化阻抗匹配。双超细纳米晶相与非晶薄片不仅提供包含自然共振、交换共振和涡流损耗的多重磁损耗能力，同时促进磁导率提升；而引入的非晶/纳米晶相异质界面带来大量缺陷和偶极子，增强了多极化损耗。此外，非晶FeSiBCr基体确保高电阻率和低介电常数。更在FeSiBCr薄片表面形成约15 nm的非晶混合氧化物层以引入界面极化。双纳米晶相、非晶FeSiBCr薄片及核壳结构共同保障了良好的阻抗匹配与增强的损耗能力，实现卓越微波吸收性能。优化后的复合材料在12.4 GHz频率、2.20 mm厚度下获得−40.62 dB的最小反射损耗，1.90 mm厚度时有效吸收带宽达6.40 GHz (覆盖11.44–17.84 GHz)。通过周期性多层结构设计，更可将吸收带宽扩展至12.68 GHz，提升幅度达198.1%。雷达散射截面仿真进一步验证了其在实际场景中的优异隐身性能。

关键词: 非晶/晶态异质界面, 多重电磁损耗, 微波吸收, 薄片, FeSiBCr

Abstract:

Balancing impedance matching and loss capability in amorphous materials remains a huge challenge for obtaining excellent microwave absorption performance. In this work, FeNi and α-Fe dual nanocrystalline phases have been constructed in FeSiBCr flakes to enhance loss capability and optimize impedance matching. Dual ultrafine nanocrystalline phases and amorphous flakes not only provide multiple magnetic loss abilities accompanied by natural resonance, exchange resonance and eddy current loss but also facilitates improved permeability, while introducing rich heterointerfaces between amorphous and nanocrystalline phases brings a large number of defects and dipoles, enhancing multi-polarization losses. Additionally, the amorphous FeSiBCr matrix ensures high resistance and low permittivity. Moreover, ~15 nm amorphous hybrid oxides layer is formed on the surface of FeSiBCr flakes to introduce interfacial polarization. Dual nanocrystalline phases, amorphous FeSiBCr flakes and core-shell structure ensure good impedance matching and enhanced loss capability, leading to remarkable absorption toward microwave. The optimized composites deliver the minimal reflection loss of −40.62 dB at 12.4 GHz under 2.20 mm and the optimal effective absorption bandwidth of 6.40 GHz with 1.90 mm, covering 11.44–17.84 GHz. Furthermore, periodic multilayer structure design can extend absorption bandwidth to 12.68 GHz, with an increase of 198.1%. Radar cross section simulation further supports its good stealth performance in real-world scenarios.

Key words: Amorphous/crystalline heterointerface, Multiple electromagnetic loss, Microwave absorption, Flakes, FeSiBCr

朱良森, 崔彩云, 景涛, 谭世豪, 刘先国, 余梦琳. 多介电弛豫与多磁共振诱导的非晶FeSiBCr薄片双纳米晶相实现强宽带微波吸收[J]. 物理化学学报, 2026, 42(9), 100331. doi: 10.1016/j.actphy.2026.100331

Liangsen Zhu, Caiyun Cui, Tao Jing, Shihao Tan, Xianguo Liu, Menglin Yu. Strong and broadband microwave absorption under thin thickness induced by multiple dielectric relaxation and multiple magnetic resonances through the dual nanocrystalline phases in amorphous FeSiBCr flakes[J]. Acta Phys. -Chim. Sin. 2026, 42(9), 100331. doi: 10.1016/j.actphy.2026.100331

链接本文: https://www.whxb.pku.edu.cn/CN/10.1016/j.actphy.2026.100331

https://www.whxb.pku.edu.cn/CN/Y2026/V42/I9/100331

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