Conductivity-dependent dielectric properties and microwave absorption of Al-doped SiC whiskers

Kuang, Jianlei; Jiang, Peng; Ran, Fan-Yong; Cao, Wenbin

doi:10.1016/j.jallcom.2016.06.168

Cited by 105 publications

(34 citation statements)

References 26 publications

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“…In order to further increase the dielectric loss, the common practice is to introduce conductive materials into nanomaterials because the conductivity is proportional to the imaginary permittivity, just as [70]…”

Section: Dielectric Nanomaterialsmentioning

confidence: 99%

ε^{normal′ normal′} = ()(, ε_{0} - ε_{\infty}) \frac{ω τ}{1 + ω^{2} τ^{2}} + \frac{σ}{2 π f ε_{0}}

where ɛ 0 and ɛ ∞ describe the dielectric constant in vacuum and the relative dielectric permittivity at high‐frequency limit, respectively, ω is the angular frequency, τ the relaxation time, and f represents frequency. From this equation, a larger electrical conductivity leads to increased dielectric loss.…”

Section: Component Effectmentioning

confidence: 99%

See 1 more Smart Citation

Recent progress in microwave absorption of nanomaterials: composition modulation, structural design, and their practical applications

Zhang

Guo

Wang

et al. 2018

IET Nanodielectrics

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The increasing electromagnetic (EM) radiation arise from the vast usage of EM techniques in civilian and military fields has spawned extensive concerns on scientific research with respect to EM wave absorbers. Nanomaterials, as a new type of nano-absorbing agent, have been investigated in detail over the recent years. This review article aims at elaborating the influence of component regulation and structural design on microwave absorption (MA) performance. Combined with the experimental efforts towards the development of nano-absorbers, the relevant absorption mechanisms are also discussed. In addition, from a prospective point, only focus on the exploration of absorbent itself is not enough, but also need matrix material to support. Based on this circumstance, the study summarises various kinds of polymer-based nanocomposites used as excellent absorbers for practical MA applications.

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Section: Dielectric Nanomaterialsmentioning

confidence: 99%

ε^{normal′ normal′} = ()(, ε_{0} - ε_{\infty}) \frac{ω τ}{1 + ω^{2} τ^{2}} + \frac{σ}{2 π f ε_{0}}

Section: Component Effectmentioning

confidence: 99%

Recent progress in microwave absorption of nanomaterials: composition modulation, structural design, and their practical applications

Zhang

Guo

Wang

et al. 2018

IET Nanodielectrics

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“…1D nanomaterials have large length-diameter ratio, high thermal stability and good mechanical properties, which can especially transmit electromagnetic wave directionally (Wu et al, 2016a). Kuang et al (2016) found that a three-dimensional (3D) conductive path for the dissipative current can be formed by the connection of 1D structures disorderly dispersed in a matrix, which directly leads to a significant increase in conduction loss.…”

Section: Introductionmentioning

confidence: 99%

Ultra-High Electromagnetic Absorption Property of One-Dimensional Carbon-Supported Ni/Mo2C and Polyvinylidene Fluoride

et al. 2019

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A novel one-dimensional carbon-supported Ni/Mo 2 C (Ni/Mo 2 C-C) nanocomposite with excellent electromagnetic wave absorption properties was successfully synthesized by annealing NiMoO 4 @PDA directly, and then the (Ni/Mo 2 C-C)/polyvinylidene fluoride (PVDF) composites were fabricated using a simple blending and hot-molding technique. An excellent reflection loss (RL) of −55.91 dB at 9.28 GHz with a low filler loading (15 wt%) and effective bandwidth (RL < −10 dB) of 14.12 GHz in the thickness range of 1.5–5.0 mm was obtained. Dielectric loss is considered to be the dominant mechanism of (Ni/Mo 2 C-C)/PVDF, which was confirmed by the Debye relaxation process and attenuation theory.

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“…For example, many materials have been developed to reduce the radar signature of aircraft, ships and tanks in military fields. Material examples include carboneous materials such as graphite 4 , graphene 5 , carbon nanotubes (CNTs) 6 and carbon fibers 7 , conducting polymers 8 , oxides such as Fe 2 O 3 9 , Fe 3 O 4 10 , MnO 2 11 , ZnO 12 , BaFe 12 O 19 13 , BaTiO 3 13 , SrFe 12 O 19 14 , and carbides such as SiC 15 and SiCN 16 . Traditional mechanisms that are commonly believed to be responsible include dipole rotation and magnetic domain resonance due to the dielectric and magnetic losses inside the materials.…”

Section: Introductionmentioning

confidence: 99%

Doped, conductive SiO2 nanoparticles for large microwave absorption

et al. 2018

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Although many materials have been studied for the purpose of microwave absorption, SiO2 has never been reported as a good candidate. In this study, we present for the first time that doped, microwave conductive SiO2 nanoparticles can possess an excellent microwave absorbing performance. A large microwave reflection loss (RL) of −55.09 dB can be obtained. The large microwave absorption originates mainly from electrical relaxation rather than the magnetic relaxation of the incoming microwave field. The electrical relaxation is attributed to a large electrical conductivity that is enabled by the incorporation of heterogeneous (N, C and Cl) atoms. The removal of the magnetic susceptibility only results in a negligible influence of the microwave absorption. In contrast, the removal of the heterogeneous atoms leads to a large decrease in the electrical conductivity and microwave absorption performance. Meanwhile, the microwave absorption characteristics can be largely adjusted with a change of the thickness, which provides large flexibility for various microwave absorption applications.

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Conductivity-dependent dielectric properties and microwave absorption of Al-doped SiC whiskers

Cited by 105 publications

References 26 publications

Recent progress in microwave absorption of nanomaterials: composition modulation, structural design, and their practical applications

Recent progress in microwave absorption of nanomaterials: composition modulation, structural design, and their practical applications

Ultra-High Electromagnetic Absorption Property of One-Dimensional Carbon-Supported Ni/Mo2C and Polyvinylidene Fluoride

Doped, conductive SiO2 nanoparticles for large microwave absorption

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