X Band electromagnetic property influence of multi-walled carbon nanotube in hybrid MnZn ferrite and carbonyl iron composites

Lopes, Braulio Haruo Kondo; Portes, Roberto Camargo; Amaral, Miguel Angelo do; Florez-Vergara, D. E.; Gama, Adriana Medeiros; Silva, V.A.; Quirino, Sandro Fonseca; Baldan, Maurício Ribeiro

doi:10.1016/j.jmrt.2019.12.068

Cited by 26 publications

(7 citation statements)

References 31 publications

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“…The atomic, electronic, and dipolar polarizations are the main mechanisms of dielectric loss 71 . Among them, only dipolar polarizations occur in the microwave range due to the interfacial relaxations in which the accumulation of free charges at grain boundaries and defects of material enhances the dipoles 72 – 74 . The complex permittivity (ε r ) can be effectively modeled by considering the Debye equation for dipolar polarization and for conductivity losses as follows 75 : where the first term describes the superposition of different relaxation mechanisms and the second one is related to the contribution of electrical conductivity in which σ = σ dc + σ ac .…”

Section: Resultsmentioning

confidence: 99%

Structural, magnetic, and gigahertz-range electromagnetic wave absorption properties of bulk Ni–Zn ferrite

Derakhshani

Taheri-Nassaj

Jazirehpour

et al. 2021

Sci Rep

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Nickel–zinc ferrite (Ni0.5Zn0.5Fe2O4) powders were prepared by the conventional solid-state route and sintered at 1100 and 1300 °C for utilization as a tile electromagnetic wave absorber. Structural, magnetic, and microwave absorption properties were investigated by characterization techniques of X-ray diffraction, thermogravimetric analysis, Raman spectroscopy, electron microscopy, vibrating sample magnetometry, and vector network analyzer. The samples sintered at 1300 °C showed high magnetic saturation of 87 emu/g and low coercivity of 4 Oe. Electromagnetic investigations exhibit high reflection losses up to − 48.1 dB at certain high and low gigahertz frequencies, as clearly depicted in the 3D contour plot. The optimized condition between reflection loss, thickness, and bandwidth revealed a reflection loss of about − 36.1 dB at the matching thickness of 3.7 mm for the X-band. Furthermore, the effective working bandwidth at − 10 dB was up to ~ 7.1 GHz for the minimum thickness of 4.3 mm, which thoroughly covered the C-band. The microwave absorption performance of the well-sintered Ni–Zn ferrite was attributed to the incorporation of dielectric and magnetic loss mechanisms in which the magnetic part prevails.

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Section: Resultsmentioning

confidence: 99%

Structural, magnetic, and gigahertz-range electromagnetic wave absorption properties of bulk Ni–Zn ferrite

Derakhshani

Taheri-Nassaj

Jazirehpour

et al. 2021

Sci Rep

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“…Multi-walled carbon nanotubes (MWCNTs) are commonly used as microwave susceptors for synthesis of biomaterials. 68,69 Ti6Al4V/TiC/HA composites were prepared from Ti6Al4V powder (78.7 vol%), MWCNTs (13.4 vol%) and HA powder (7.9 vol%) by pressing their mixture (∅15 × 22 mm) at 200 MPa for subsequent microwave sintering at 1400 W for 2 min, with the maximum sample temperature of 1620 °C. 70,71 The porosity was about 26% and the compressive strength was 93.2 MPa, with compressive modulus of 2.9 GPa.…”

Section: Composites Prepared By Microwave Sinteringmentioning

confidence: 99%

Microwave-assisted synthesis of composites based on titanium and hydroxyapatite for dental implantation

Zuo,

Peng,

Luo

et al. 2024

Biomater. Sci.

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“…In the last few decades, carbon-based nanoabsorbers have been extensively studied as fillers for structural absorbers [ 1 , 2 , 3 ]. Especially for the aerospace industry, where the property of light weight is essential, carbon-based structural absorbers have received much attention because of their thermal stability, light weight, and broadband electromagnetic (EM) wave absorption [ 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Lightweight and Compression-Resistant Carbon-Based Sandwich Honeycomb Absorber with Excellent Electromagnetic Wave Absorption

Song

Hou

et al. 2022

Nanomaterials

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Honeycomb (HC) composites were fabricated by impregnating an aramid paper HC core with carbon nanotubes/carbon black/reduced graphene oxide (CNTs/CB/RGO) and polyurethane resin (PU). The sandwich HC (SHC) absorber containing HC composites with superior microwave-absorption properties were fabricated using the vacuum bagging method. Through the absorption performance of the SHC absorber, it can be concluded that the triple-layer SHC absorber has the best absorbing performance. The effective bandwidth (reflection loss < 10 dB) can be achieved in the entire frequency range of 2.2–18 GHz, and the minimum RL value is −35 dB. Furthermore, the compressive stress of the triple-layer SHC absorber reached 3.71 MPa, which is similar to the compressive stress of aluminum HC panels for aviation. Benefiting from the excellent integration of absorption and mechanical performance, the SHC has significant potential in the stealth-technology field.

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X Band electromagnetic property influence of multi-walled carbon nanotube in hybrid MnZn ferrite and carbonyl iron composites

Cited by 26 publications

References 31 publications

Structural, magnetic, and gigahertz-range electromagnetic wave absorption properties of bulk Ni–Zn ferrite

Structural, magnetic, and gigahertz-range electromagnetic wave absorption properties of bulk Ni–Zn ferrite

Microwave-assisted synthesis of composites based on titanium and hydroxyapatite for dental implantation

Lightweight and Compression-Resistant Carbon-Based Sandwich Honeycomb Absorber with Excellent Electromagnetic Wave Absorption

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