Microwave Absorption of Double-Layer Absorber Based on Nanocomposite BaFe12O19/α–Fe and Nanocrystalline Alloy Fe0.2(Co0.2Ni0.8)0.8 Microfibers

In this paper, the prepared nanocomposite BaFe12O19/α-Fe microfibers and nanocrystalline magnetic alloy Fe0.2(Co0.2Ni0.8)0.8 microfibers are used as absorbents in the double layer structure for microwave absorption. The double layer absorbers with a total thickness of 2.0 mm, in which various matching and absorbing layers are designed, and their absorption properties are estimated. The results show that the absorbers with the matching layer of nanocomposite BaFe12O19/α-Fe microfibers have a very high microwave absorption performance. The absorption bandwidth (the reflection loss (RL) less than-20 dB) reaches 5.8 GHz ranging from 12.2 to 18 GHz, and the minimum RL value is-61.2 dB at about 15.2 GHz with 0.9 mm matching layer and 1.1mm absorbing layer respectively.

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Electromagnetic and Microwave Absorption of Nanocrystalline Alloy Fe0.2(Co0.2Ni0.8)0.8 and Nanocomposite SrFe12O19/Ni0.5Zn0.5Fe2O4 Microfibers

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1035.355 ◽

2014 ◽

Vol 1035 ◽

pp. 355-360

Author(s):

Min Li ◽

Zhou Wang ◽

Hong Bo Liu ◽

Xiang Qian Shen

Keyword(s):

Microwave Absorption ◽

Double Layer ◽

Reflection Loss ◽

Layer Structure ◽

Nanocrystalline Alloy ◽

Electromagnetic Parameter ◽

Total Thickness ◽

Absorption Properties ◽

Microwave Absorption Properties ◽

Double Layer Structure

Magnetic nanocrystalline alloy Fe0.2(Co0.2Ni0.8)0.8 microfibers and nanocomposite SrFe12O19/Ni0.5Zn0.5Fe2O4 microfibers are used as the absorbents in the double-layer structure for microwave absorption. The double-layer absorbers with a total thickness of 2 mm consisting of Fe0.2(Co0.2Ni0.8)0.8 and nanocomposite SrFe12O19/Ni0.5Zn0.5Fe2O4 microfibers are designed, and their microwave absorption properties are predicted based on the electromagnetic parameter measurements. The results show that the double-layer absorber with the absorption layer of SrFe12O19/Ni0.5Zn0.5Fe2O4 microfibers and the thickness of 0.6 mm has the best microwave absorption properties, with the bandwidth ( the reflection loss less than −10 dB) of 7.3 GHz ranging from 10.7 GHz to 18 GHz, and the maximum reflection loss of −71.4 dB at 12.1 GHz.

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Enhanced Microwave Absorption Performance of Double-Layer Absorbers Containing BaFe12O19 Ferrite and Graphite Nanosheet Composites

Journal of Electronic Materials ◽

10.1007/s11664-019-07730-5 ◽

2019 ◽

Vol 49 (1) ◽

pp. 819-825 ◽

Cited By ~ 1

Author(s):

Dandan Min

Keyword(s):

Microwave Absorption ◽

Double Layer ◽

Graphite Nanosheet ◽

Absorption Performance ◽

Microwave Absorption Performance

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Effect of Reaction Time on Microwave Absorption Properties of Fe3O4 Hollow Spheres Synthesized via Ostwald Ripening

Materials ◽

10.3390/ma12182921 ◽

2019 ◽

Vol 12 (18) ◽

pp. 2921 ◽

Cited By ~ 1

Author(s):

Wei Huang ◽

Yujiang Wang ◽

Shicheng Wei ◽

Bo Wang ◽

Yi Liang ◽

...

Keyword(s):

Reaction Time ◽

Microwave Absorption ◽

Ostwald Ripening ◽

Impedance Matching ◽

Hollow Spheres ◽

Absorption Properties ◽

Microwave Absorption Properties ◽

Magnetic Structures ◽

Absorption Performance ◽

Microwave Absorption Performance

Hollow magnetic structures have great potential to be used in the microwave absorbing field. Herein, Fe3O4 hollow spheres with different levels of hollowness were synthesized by the hydrothermal method under Ostwald ripening effect. In addition to their microstructures, the microwave absorption properties of such spheres were investigated. The results show that the grain size and hollowness of Fe3O4 hollow spheres both increase as the reaction time increases. With increasing hollowness, the attenuation ability of electromagnetic wave of Fe3O4 spheres increases first and then decreases, finally increases sharply after the spheres break down. Samples with strong attenuation ability can achieve good impedance matching, which it does preferentially as the absorber thickness increases. Fe3O4 hollow spheres show the best microwave absorption performance when the reaction time is 24 h. The minimum reflection loss (RL (min)) can reach −40 dB, while the thickness is only 3.2 mm.

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