Dielectric loss enhancement induced by the microstructure of CoFe<sub>2</sub>O<sub>4</sub> foam to realize broadband electromagnetic wave absorption

Bin Shi; Hongsheng Liang; Zijun Xie; Qing Chang; Hongjing Wu

doi:10.1007/s12613-023-2599-4

Volume 30 Issue 7

Jul. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(7): 1388-1397

Bin Shi, Hongsheng Liang, Zijun Xie, Qing Chang, and Hongjing Wu, Dielectric loss enhancement induced by the microstructure of CoFe₂O₄ foam to realize broadband electromagnetic wave absorption, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1388-1397. https://doi.org/10.1007/s12613-023-2599-4

Cite this article as:

Bin Shi, Hongsheng Liang, Zijun Xie, Qing Chang, and Hongjing Wu, Dielectric loss enhancement induced by the microstructure of CoFe2O4 foam to realize broadband electromagnetic wave absorption, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1388-1397. https://doi.org/10.1007/s12613-023-2599-4

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Research Article

Dielectric loss enhancement induced by the microstructure of CoFe₂O₄ foam to realize broadband electromagnetic wave absorption

+ Author Affiliations

Corresponding authors:
Qing Chang E-mail: changqingyau@126.com

Hongjing Wu E-mail: wuhongjing@nwpu.edu.cn
Received: 6 December 2022; Revised: 5 January 2023; Accepted: 6 January 2023; Available online: 11 January 2023

Abstract

Abstract

CoFe₂O₄ has been widely used for electromagnetic wave absorption owing to its high Snoek limit, high anisotropy, and suitable saturation magnetization; however, its inherent shortcomings, including low dielectric loss, high density, and magnetic agglomeration, limit its application as an ideal absorbent. This study investigated a microstructure regulation strategy to mitigate the inherent disadvantages of pristine CoFe₂O₄ synthesized via a sol–gel auto-combustion method. A series of CoFe₂O₄ foams (S0.5, S1.0, and S1.5, corresponding to foams with citric acid (CA)-to-Fe(NO₃)₃·9H₂O molar ratios of 0.5, 1.0, and 1.5, respectively) with two-dimensional (2D) curved surfaces were obtained through the adjustment of CA-to-Fe³⁺ ratio, and the electromagnetic parameters were adjusted through morphology regulation. Owing to the appropriate impedance matching and conductance loss provided by moderate complex permittivity, the effective absorption bandwidth (EAB) of S0.5 was as high as 7.3 GHz, exceeding those of most CoFe₂O₄-based absorbents. Moreover, the EAB of S1.5 reached 5.0 GHz (8.9–13.9 GHz), covering most of the X band, owing to the intense polarization provided by lattice defects and the heterogeneous interface. The three-dimensional (3D) foam structure circumvented the high density and magnetic agglomeration issues of CoFe₂O₄ nanoparticles, and the good conductivity of 2D curved surfaces could effectively elevate the complex permittivity to ameliorate the dielectric loss of pure CoFe₂O₄. This study provides a novel idea for the theoretical design and practical production of lightweight and broadband pure ferrites.
- CoFe₂O₄ foam;
- lightweight;
- broadband absorption;
- microstructure regulation;
- dielectric loss

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