Magnetic and microwave absorption properties of FeCo/CoFe2O4 composite powders

Golchinvafa, S.; Masoudpanah, S.M.; Jazirehpour, M.

doi:10.1016/j.jallcom.2019.151746

Cited by 81 publications

(18 citation statements)

References 50 publications

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“…With respect to metal/metal oxide composites, Fe 3 O 4 , NiO, NiFe 2 O 4 , CoFe 2 O 4 composting with metal components are also reported to alleviate impedance match characteristic. [19][20][21][22] Meanwhile, the metal oxides introduction process is time-consuming, not to mention the density issue of such materials is getting worse. Up to now, reports on well-designed morphology and configuration to achieve lightweight and high-performance features simultaneously for metal-based EM wave absorbing materials are scarce.…”

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confidence: 99%

Lightweight Ni Foam‐Based Ultra‐Broadband Electromagnetic Wave Absorber

Qin

Zhang

Zhao

2021

Adv Funct Materials

302

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Skin effect and high density are the main reasons that restrict the search of lightweight and high-performance metal-based electromagnetic (EM) wave absorbing materials. Although nanostructured metal materials have been fabricated to solve above problems, poor dispersibility and chemical stability issues brought about by high surface energy due to existing nano-size effect. In this work, lightweight Ni foam with NiO/NiFe 2 O 4 in situ growth composites are fabricated by a facile and universal route as an effective alternative to high-performance metal-based EM wave absorber. Impressively, it is found that the foam structure and NiO/NiFe 2 O 4 /Ni components can synergistically boost EM wave absorption capacity. In detail, impedance matching from foam structure and energy dissipation from interfacial polarization and defect induced polarization provided by NiO/NiFe 2 O 4 mainly contributes to its ultra-broadband EM wave absorption performance. As a result, the as-prepared sample (0.06 g•cm −3 ) delivers a wide absorption bandwidth of 14.24 GHz and thin thickness of 0.6 mm, as well as, high specific effective absorption bandwidth of 19444.4 GHz•g −1 •cm −2 . This work sheds light on the novel view on the synergistic effect of structure and components on EM wave absorption behaviors and demonstrates a new pathway for preparation of lightweight and high-performance metal-based EM wave absorbers.

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confidence: 99%

Lightweight Ni Foam‐Based Ultra‐Broadband Electromagnetic Wave Absorber

Qin

Zhang

Zhao

2021

Adv Funct Materials

302

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“…Thus, the value of α is calculated as well, which is estimated by the following equation. 43,44 Figure 8 displays the α values of pure FA and CoFA700. It is clear that the CoFA700 displays the higher α value, corresponding to the ideal attenuation effect for the incident microwave.…”

Section: Resultsmentioning

confidence: 99%

“…The attenuation constant ( α ) is also an important parameter for reflecting the intrinsic attenuation ability. Thus, the value of α is calculated as well, which is estimated by the following equation 43,44

α = (\sqrt{2} π f / c) \sqrt{(μ^{″} ε^{″} ‐ μ^{'} ε^{'}) + \sqrt{{()(, μ^{″} ε^{″} ‐ μ^{'} ε^{'})}^{2} + {()(, ε^{'} μ^{″} ‐ ε^{″} μ^{'})}^{2}}}

…”

Section: Resultsmentioning

confidence: 99%

Two‐step preparation of fly ash‐based composites for microwave absorption

Zhu

Tian

Liang

et al. 2021

Int J Applied Ceramic Tech

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Accompanying with the rapid development of electronic components and devices, the abundant electromagnetic interference and radiation have caused serious influences on electric communication and human health. [1][2][3] Thus, it is urgent to design an excellent MA material with the performances of strong absorption, broad frequency range, tiny thickness, and low cost for solving electromagnetic pollution. As is known, an ideal absorber is a hybrid material composed of both magnetic loss and dielectric loss. 4,5 Recently, considerable efforts have been devoted to combining magnetic components with carbon materials to fabricate hybrid composites, 6-8 which not only can regulate impedance matching, but also improve the attenuation ability. However, it remains a great challenge to prepare these carbon-based materials using a simple and lowcost method.FA, the solid waste, is generated during the combustion of coal in coal-fired power plants. Its improper disposal has become a serious environment problem. 9 Due to the chemical composition and unique morphology of FA, its application fields have already involved in the synthesis of zeolite, backfill material, lightweight aggregate, road subbase, building materials, agricultural melioration, element extraction, sewage disposal, and so on. 10 Furthermore, although the FA cenosphere has the potential for fabricating excellent microwave

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“…9 Traditional ferrite materials possess exclusive features of strong saturation magnetization, high complex permeability as well as being of low cost, which have been extensively applied in the eld of microwave absorption. 10,11 Ferrosoferric oxide (Fe 3 O 4 ) as the simplest ferromagnetic substance has been widely used in dye degradation, 12 biomedical applications, 13 hydrogen storage, 14 energy storage devices, 15 electromagnetic absorbers, 16 etc. Especially in the domain of microwave absorption, natural resonance and eddy-current effect reveal unexceptionable magnetic loss in the high-frequency range.…”

Section: Introductionmentioning

confidence: 99%