Significant high-frequency electromagnetic wave absorption performance of Ni2+xMn1−xGa alloys

Feng, Jing; Li, Zongbin; Jia, Youshun; Yang, Bo; Liu, Shaojun; Zhao, Xiang; Li, Lingwei; Zuo, Liang

doi:10.1007/s10853-018-2440-z

Cited by 18 publications

(5 citation statements)

References 43 publications

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“…Specifically, they are more profound at frequency range of 10 3 –10 6 GHz, which lie between infrared area and ultraviolet region. [ 38 , 39 , 40 , 41 , 42 ] In other words, their contribution to EM loss at this frequency is negligible and explanation of EM wave attenuation through these mechanisms may be inappropriate. Therefore, conduction loss, dipole polarization, interfacial polarization, and defect‐induced polarization are the main contribution source to EM wave loss at gigahertz.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

2022

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Electromagnetic (EM) wave absorbing materials play an increasingly important role in modern society for their multi-functional in military stealth and incoming 5G smart era. Dielectric loss EM wave absorbers and underlying loss mechanism investigation are of great significance to unveil EM wave attenuation behaviors of materials and guide novel dielectric loss materials design. However, current researches focus more on materials synthesis rather than in-depth mechanism study. Herein, comprehensive views toward dielectric loss mechanisms including interfacial polarization, dipolar polarization, conductive loss, and defect-induced polarization are provided. Particularly, some misunderstandings and ambiguous concepts for each mechanism are highlighted. Besides, in-depth dielectric loss study and novel dielectric loss mechanisms are emphasized. Moreover, new dielectric loss mechanism regulation strategies instead of regular components compositing are summarized to provide inspiring thoughts toward simple and effective EM wave attenuation behavior modulation.

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Section: Introductionmentioning

confidence: 99%

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

2022

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“…Generally, RL values ≤−10 dB correspond to a more than 90% attenuation ability of the incident microwave. Therefore, the effective absorption bandwidth (the frequency range for RL ≤ −10 dB) is abbreviated as Δ f [ 29 ].…”

Section: Resultsmentioning

confidence: 99%

Hard Carbon Embedded with FeSiAl Flakes for Improved Microwave Absorption Properties

et al. 2022

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Carbon-based composites have been proven to be strong candidates for microwave absorbers in recent years. However, as an important member, magnetic hard carbon (HC)-based composites have rarely been studied in the field of microwave absorption. In this study, HC embedded with FeSiAl (FeSiAl@HC) was synthesized by pyrolyzing a mixture of FeSiAl flakes and phenolic resin (PR). The as-synthesized HC-FeSiAl exhibited a layered structure, and the detailed microstructures were modified by changing the mass ratio of FeSiAl flakes and PR. Thus, the as-synthesized HC-FeSiAl exhibited tunable magnetic properties, wealthy functional groups, excellent thermal stability, and enhanced microwave absorption properties. The optimal minimum reflection loss is lower up to −36.1 dB, and the effective absorption bandwidth is wider up to 11.7 GHz. These results indicated that HC-FeSiAl should be a strong candidate for practical applications of microwave absorption, which may provide new insight into the synthesis of magnetic HC-based composites.

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“…The complex permittivity (ε r -jε r "), complex permeability (µ -jµ"), and microwave absorption characteristics of magnetite composites produced at various milling durations and thicknesses of 1 and 2 mm were examined in the X and Ku bands (8-18 GHz) frequency ranges. The real components (ε and µ ) represent the storage capacity of electric and magnetic energies, respectively, whereas the imaginary parts (ε" and µ") indicate the loss capacity of electric and magnetic energies, respectively [67,68].…”

Section: Complex Permittivity and Complex Permeabilitymentioning

confidence: 99%

Structural, Electromagnetic and Microwave Properties of Magnetite Extracted from Mill Scale Waste via Conventional Ball Milling and Mechanical Alloying Techniques

et al. 2021

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This study presents the utilization of mill scale waste, which has attracted much attention due to its high content of magnetite (Fe3O4). This work focuses on the extraction of Fe3O4 from mill scale waste via magnetic separation, and ball milling was used to fabricate a microwave absorber. The extracted magnetic powder was ground-milled using two different techniques: (i) a conventional milling technique (CM) and (ii) mechanical alloying (MM) process. The Fe3O4/CM samples were prepared by a conventional milling process using steel pot ball milling, while the Fe3O4/MM samples were prepared using a high-energy ball milling (HEBM) method. The effect of milling time on the structural, phase composition, and electromagnetic properties were examined using X-ray diffraction (XRD) and a vector network analyzer (VNA). XRD confirmed the formation of magnetite after both the magnetic separation and milling processes. The results revealed that Fe3O4 exhibited excellent microwave absorption properties because of the synergistic characteristics of its dielectric and magnetic loss. The results showed that the Fe3O4/CM particle powder had a greater absorption power (reflection loss: <−10 dB) with 99.9% absorption, a minimum reflection loss of −30.83 dB, and an effective bandwidth of 2.30 GHz for 2 mm thick samples. The results revealed the Fe3O4/MM powders had higher absorption properties, including a higher RL of −20.59 dB and a broader bandwidth of 2.43 GHz at a matching thickness of only 1 mm. The higher microwave absorption performance was attributed to the better impedance matching property caused by the porous microstructure. Furthermore, the magnetite, Fe3O4 showed superior microwave absorption characteristics because of the lower value of permittivity, which resulted in better impedance matching. This study presents a low-cost approach method by reutilizing mill scale waste to fabricate a high purity crystalline Fe3O4 with the best potential for designing magnetic nano-sized based microwave absorbers.

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Significant high-frequency electromagnetic wave absorption performance of Ni2+xMn1−xGa alloys

Cited by 18 publications

References 43 publications

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Hard Carbon Embedded with FeSiAl Flakes for Improved Microwave Absorption Properties

Structural, Electromagnetic and Microwave Properties of Magnetite Extracted from Mill Scale Waste via Conventional Ball Milling and Mechanical Alloying Techniques

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