Ultra-broadband FeNi3/NiZnFe2O4/ZnO composite powders for microwave absorption

Golchinvafa, S.; Masoudpanah, S.M.; Alamolhoda, S.

doi:10.1016/j.jmrt.2022.09.123

Cited by 11 publications

(4 citation statements)

References 79 publications

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“…In fuel‐rich components, metal oxides can be reduced to metals in a reducing atmosphere. [ 25 ] FeNi alloy can be formed by solid‐state reaction between the produced Fe and Ni metals when the temperature is 700 °C in a reduced atmosphere. [ 20 ] Under this pyrolysis condition, Zn element exists as ZnO.…”

Section: Resultsmentioning

confidence: 99%

Controllable Architecture of ZnO/FeNi Composites Derived from Trimetallic ZnFeNi Layered Double Hydroxides for High‐Performance Electromagnetic Wave Absorbers

Gan

Rao

Deng

et al. 2023

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The optimization design of micro‐structure and composition is an important strategy to obtain high‐performance metal‐based electromagnetic (EM) wave absorption materials. In this work, ZnO/FeNi composites derived from ZnFeNi layered double hydroxides are prepared by a one‐step hydrothermal method and subsequent pyrolysis process, and can be employed as an effective alternative for high‐performance EM wave absorber. A series of ZnO/FeNi composites with different structures are obtained by varying the molar ratios of Zn2+/Fe3+/Ni2+, and the ZnO/FeNi composites with a Zn2+/Fe3+/Ni2+ molar ratio of 6:1:3 show a hierarchical flower‐like structure. Owing to the strong synergistic loss mechanism of dielectric‐magnetic components and favorable structural features, this hierarchical flower‐like ZnO/FeNi sample supplies the optimal EM wave absorption performance with the highest reflection loss of −52.08 dB and the widest effective absorption bandwidth of 6.56 GHz. The EM simulation further demonstrates that impedance matching plays a determining role in EM wave absorption performance. This work provides a new way for the fabrication of a high‐performance metal‐based EM wave absorber.

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Section: Resultsmentioning

confidence: 99%

Controllable Architecture of ZnO/FeNi Composites Derived from Trimetallic ZnFeNi Layered Double Hydroxides for High‐Performance Electromagnetic Wave Absorbers

Gan

Rao

Deng

et al. 2023

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“…However, the

of CIPs ball-milled for 12 h and 16 h obviously improved. This can be explained by the free electron theory [ 18 , 29 ]:

where

and

are the conductivity and permittivity in free space, respectively. At a certain electromagnetic frequency

, the

is proportional to the conductivity

of the material.…”

Section: Resultsmentioning

confidence: 99%

“…However, the ε of CIPs ball-milled for 12 h and 16 h obviously improved. This can be explained by the free electron theory [18,29]:…”

Section: Effect Of Ball-milling Parameters On Em Properties Of F-cipsmentioning

confidence: 99%

Effect of Ball-Milling Process on Microwave Absorption Behaviors of Flaky Carbonyl Iron Powders

et al. 2023

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Electromagnetic (EM) wave absorption performance is greatly affected by the microscopic morphology of the absorbing material particles. In this study, a facile and efficient ball-milling method was applied to increase the aspect ratio of particles and prepare flaky carbonyl iron powders (F-CIPs), one of the most readily commercially available absorbing materials. The effect of ball-milling time and rotation speed on the absorption behaviors of the F-CIPs was investigated. The microstructures and compositions of the F-CIPs were determined using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The EM parameters were measured using a vector network analyzer (VNA) in the frequency range of 2–18 GHz. The results indicated that the ball-milled flaky CIPs exhibited a better absorption ability than the raw spherical CIPs. Among all the samples, the sample milled at 200 r/min for 12 h and the sample milled at 300 r/min for 8 h showed remarkable EM parameters. The ball-milling sample with 50 wt.% F-CIPs had a minimum reflection loss peak of −14.04 dB at a thickness of 2 mm and a maximum bandwidth (RL < −7 dB) of 8.43 GHz at a thickness of 2.5 mm, a result that conformed with the transmission line theory. Hence, the ball-milled flaky CIPs were considered to be beneficial for microwave absorption.

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“…This aspect demonstrates the possibility of using nanocomposites based on silicon and NiFe 2 O 4 powders as shielding materials in the microwave domain, opening new opportunities for flexible devices for microwave technology. The development of broadband shielding composites for the microwave domain is a very new direction of research, and up to now only pure ceramic composites were studied, e.g., FeNi 3 /NiZnFe 2 O 4 /ZnO composite in [61], with clear drawbacks related to synthesis and final shaping technology, so ferrite-rubber composites, would be a good candidate for such applications, as our study emphasizes. Based on the theory from [60], a simulation is briefly presented in Figure 13-power loss density (proportional with SE A ) in inhomogeneous composites with ferrites, here for sample S2, at 0.1 GHz and 3 GHz, respectively.…”

Section: Comparative Dielectric Testsmentioning

confidence: 91%

Flexible Electromagnetic Shielding Nano-Composites Based on Silicon and NiFe2O4 Powders

Caramitu¹,

Ciobanu

Ion³

et al. 2023

Polymers

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In this paper, the obtaining and characterization of five experimental models of novel polymer composite materials with ferrite nano-powder are presented. The composites were obtained by mechanically mixing two components and pressing the obtained mixture on a hot plate press. The ferrite powders were obtained by an innovative economic co-precipitation route. The characterization of these composites consisted of physical and thermal properties: hydrostatic density, scanning electron microscopy (SEM), and TG DSC thermal analyses, along with functional electromagnetic tests in order to demonstrate the functionality of these materials as electromagnetic shields (magnetic permeability, dielectric characteristics, and shielding effectiveness). The purpose of this work was to obtain a flexible composite material, applicable to any type of architecture for the electrical and automotive industry, necessary for protection against electromagnetic interference. The results demonstrated the efficiency of such materials at lower frequencies, but also in the microwave domain, with higher thermal stability and lifetime.

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Ultra-broadband FeNi3/NiZnFe2O4/ZnO composite powders for microwave absorption

Cited by 11 publications

References 79 publications

Controllable Architecture of ZnO/FeNi Composites Derived from Trimetallic ZnFeNi Layered Double Hydroxides for High‐Performance Electromagnetic Wave Absorbers

Controllable Architecture of ZnO/FeNi Composites Derived from Trimetallic ZnFeNi Layered Double Hydroxides for High‐Performance Electromagnetic Wave Absorbers

Effect of Ball-Milling Process on Microwave Absorption Behaviors of Flaky Carbonyl Iron Powders

Flexible Electromagnetic Shielding Nano-Composites Based on Silicon and NiFe2O4 Powders

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