Highly anisotropic Fe3C microflakes constructed by solid-state phase transformation for efficient microwave absorption

Rongzhi Zhao, Tong Gao, Yixing Li, Zhuo Sun, Zhengyu Zhang, Lianze Ji, Chenglong Hu, Xiaolian Liu, Zhenhua Zhang, Xuefeng Zhang, Gaowu Qin

科研成果: 期刊稿件文章同行评审

70 引用 (Scopus)

摘要

Soft magnetic materials with flake geometry can provide shape anisotropy for breaking the Snoek limit, which is promising for achieving high-frequency ferromagnetic resonances and microwave absorption properties. Here, two-dimensional (2D) Fe3C microflakes with crystal orientation are obtained by solid-state phase transformation assisted by electrochemical dealloying. The shape anisotropy can be further regulated by manipulating the thickness of 2D Fe3C microflakes under different isothermally quenching temperatures. Thus, the resonant frequency is adjusted effectively from 9.47 and 11.56 GHz under isothermal quenching from 700 °C to 550 °C. The imaginary part of the complex permeability can reach 0.9 at 11.56 GHz, and the minimum reflection loss (RLmin) is −52.09 dB (15.85 GHz, 2.90 mm) with an effective absorption bandwidth (EAB≤−10 dB) of 2.55 GHz. This study provides insight into the preparation of high-frequency magnetic loss materials for obtaining high-performance microwave absorbers and achieves the preparation of functional materials from traditional structural materials.

源语言英语
文章编号1497
期刊Nature Communications
15
1
DOI
出版状态已出版 - 12月 2024
已对外发布

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