Preparation and Microwave Absorption Properties of Core/Shell Structured FeSiBCuNbZr@SiO2 Amorphous Composites

doi:10.11901/1005.3093.2025.269

Chinese Journal of Materials Research

2026, Vol. 40

Issue (4): 254-262 DOI: 10.11901/1005.3093.2025.269

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Preparation and Microwave Absorption Properties of Core/Shell Structured FeSiBCuNbZr@SiO₂ Amorphous Composites

HUANG Shiha¹, DONG Xinglong¹(

), PEI Leizhen¹, ZHANG Xingguo¹^,²

^1.School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
^2.Ningbo Institute of Dalian University of Technology, Ningbo 315016, China

Cite this article:

HUANG Shiha, DONG Xinglong, PEI Leizhen, ZHANG Xingguo. Preparation and Microwave Absorption Properties of Core/Shell Structured FeSiBCuNbZr@SiO₂ Amorphous Composites. Chinese Journal of Materials Research, 2026, 40(4): 254-262.

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Abstract

FeSiBCuNbZr@SiO₂ amorphous composite was prepared by single roller melt-spinning, mechanical ball milling and sol-gel method. The microstructure, phase composition, morphology, and electromagnetic properties of the composite were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and vector network analysis. The influence of the matching thickness of SiO₂ dielectric layer on the wave absorption performance of FeSiBCuNbZr amorphous composite powder was studied. The results indicate that the optimal reflection loss of the amorphous composite powder, obtained from FeSiBCuNbZr amorphous powder and the SiO₂ dielectric layer generated by the hydrolysis and polycondensation of 5 mL tetraethyl orthosilicate is -58.19 dB at 11.2 GHz with a matching thickness of 2.18 mm. When the matching thickness is reduced to 1.85 mm, the maximum effective absorption bandwidth reaches 7.7 GHz. The excellent microwave absorption properties may be attributed to the synergistic effect between the magnetic loss from the Fe-based amorphous core and the dielectric loss from the SiO₂ shell, which collectively optimize the impedance matching.

Key words: composites microwave absorbing materials sol-gel method core-shell structure amorphous powder SiO₂ shell layer

Received: 04 September 2025

ZTFLH:

TB332

Fund: National Nature Science Foundation of China(51331006)

Corresponding Authors: DONG Xinglong, Tel: (0411)84706130, E-mail: dongxl@dlut.edu.cn

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	HUANG Shiha
	DONG Xinglong
	PEI Leizhen
	ZHANG Xingguo

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https://www.cjmr.org/EN/10.11901/1005.3093.2025.269 OR https://www.cjmr.org/EN/Y2026/V40/I4/254

Fig.1 XRD patterns of FeSiBCuNbZr amorphous powder before and after chemical coating

Fig.2 FTIR spectra of FeSiBCuNbZr amorphous powder before and after chemical coating

Fig.3 XPS spectra of FeSiBCuNbZr@SiO₂ composite powders prepared by hydrolysis of TEOS at different concentrations (a) survey, (b) C 1s, (c) Si 2p, (d) O 1s

Fig.4 SEM and TEM images of FeSiBCuNbZr@SiO₂ composite powders prepared by hydrolysis of TEOS at different concentrations (a) S0, (b) S1, (c) S2, (d) S3, (e) EDS mappings of S1, (f) TEM image of S2, (g) HRTEM, (h) SEAD

Fig.5 Two-dimensional and three-dimensional reflection loss curves of S0 (a, e), S1 (b, f), S2 (c, g) and S3 (d, h)

Table 1 Electromagnetic wave absorption performance of magnetic metal@SiO₂ composites reported in the literature

Fig.6 Real part of permittivity ε′(a), imaginary part of permittivity ε″ (b), tangent angle of dielectric loss tanδ_ε (c), real part of permeability μ′(d), imaginary part of permeability μ″(e) and tangent angle of magnetic loss tanδ_μ (f) for samples

Fig.7 Cole-Cole curves of S0 (a), S1 (b), S2 (c) and S3 (d)

Fig.8 C₀ values of S0, S1, S2 and S3 in the range of 2-18 GHz

Fig.9 Impedance matching for the S0 (a), S1 (b), S2 (c) and S3 (d)

Fig.10 Attenuation constants (α) of S0, S1, S2 and S3 samples in the range of 2-18 GHz

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