Enhanced Dielectric Loss to Improve Microwave-Absorbing Performance of Ti3SiC2/Co2Z Ferrite Composites

2022 ◽  
Author(s):  
Jun He ◽  
Xiaoyi Liu ◽  
Lianwen Deng ◽  
Yonghe Deng ◽  
Heng Luo ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Microwave Absorbing ◽  
Ferrite Composites

A simple hydrothermal process to grow MoS2 nanosheets with excellent dielectric loss and microwave absorption performance

2016 ◽  
Vol 4 (28) ◽  
pp. 6816-6821 ◽  
Author(s):  
Xiaohui Liang ◽  
Xingmiao Zhang ◽  
Wei Liu ◽  
Dongming Tang ◽  
Baoshan Zhang ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Hydrothermal Method ◽  
Microwave Absorption ◽  
Hydrothermal Process ◽  
Two Dimensional ◽  
Mos2 Nanosheets ◽  
Absorption Performance ◽  
Microwave Absorbing ◽  
Microwave Absorption Performance ◽  
Simple Hydrothermal Process

In this study, two-dimensional MoS2 nanosheets synthesized by a hydrothermal method were firstly investigated for microwave absorbing performance.

Porous-carbon-based Mo2C nanocomposites as excellent microwave absorber: a new exploration

Nanoscale ◽  
2018 ◽  
Vol 10 (15) ◽  
pp. 6945-6953 ◽  
Author(s):  
Sisi Dai ◽  
Yan Cheng ◽  
Bin Quan ◽  
Xiaohui Liang ◽  
Wei Liu ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Porous Carbon ◽  
Carbothermal Reduction ◽  
Microwave Absorber ◽  
Microwave Absorbing ◽  
Carbon Based

The as-obtained porous-carbon-based Mo2C nanocomposites via typical carbothermal reduction exhibit outstanding dielectric loss and microwave absorbing performance by resorting to the suitable mechanisms.

scholarly journals Engineering of dielectric composites on electromagnetic and microwave absorbing properties for operation in the X-band

2020 ◽  
pp. 2150001
Author(s):  
Bhoopendra Singh ◽  
Vivek Pratap ◽  
Mohit Katiyar ◽  
S. M. Abbas ◽  
Y. K. Sharma ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Network Analyzer ◽  
Frequency Range ◽  
Melt Mixing ◽  
Band Frequency ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Mixing Method ◽  
Microwave Absorbing ◽  
Potential Use

In this study, carbon black (CB) powder-loaded polyurethane (PU) composites (CB–PU composites) were prepared by melt mixing method with different volume percentages (45, 50, 55, 58 and 61 vol.%) of CB in the PU matrix. The prepared CB–PU composites had been further studied for surface morphology using the field-emission scanning electron microscopy (FESEM) technique. Dielectric properties in terms of real permittivity ([Formula: see text] and imaginary permittivity ([Formula: see text] of the fabricated composites were computed using an Agilent E8364B vector network analyzer in the frequency range of 8–12 GHz ([Formula: see text]-band). Dielectric loss factor of the prepared CB–PU composites was computed in terms of the dielectric loss tangent (tan [Formula: see text] = [Formula: see text]/[Formula: see text]. Microwave absorbing properties were appraised in terms of the reflection loss (RL) which in turn was calculated for varying thicknesses of the prepared composites from the measured real and imaginary permittivity data. The minimum RL was observed as −20.10 dB for the absorber with a thickness of 2.2 mm and the bandwidth achieved was 1.92 GHz for RL [Formula: see text]10 dB. Based on the above results these CB–PU composites have potential use as effective microwave absorbers in 8–12-GHz ([Formula: see text]-band) frequency range.

Modulating dielectric loss of mesoporous carbon fibers with radar cross section reduction performance via computer simulation technology

2021 ◽  
Author(s):  
Jiabin Chen ◽  
Xiaohui Liang ◽  
Jing Zheng ◽  
Weihua Gu ◽  
Chunchuan Pei ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Dielectric Loss ◽  
Cross Section ◽  
Carbon Fibers ◽  
Mesoporous Carbon ◽  
Tetraethyl Orthosilicate ◽  
Light Weight ◽  
Microwave Absorbing Properties ◽  
Absorbing Material ◽  
Microwave Absorbing

Mesoporous carbon fibers, a kind of light weight microwave absorbing material, are prepared by electrospinning, through which the pore structure and microwave absorbing properties are influenced by the addition of tetraethyl orthosilicate.

Microwave absorbing properties of the ferrite composites based on graphene

2016 ◽  
Vol 683 ◽  
pp. 567-574 ◽  
Author(s):  
Haibo Yang ◽  
Ting Ye ◽  
Ying Lin ◽  
Jianfeng Zhu ◽  
Fen Wang
Keyword(s):  
Microwave Absorbing Properties ◽  
Microwave Absorbing ◽  
Ferrite Composites

Characteristics of Microwave Absorption of Ni-Zn-Ferrite/Sic Hemi-Crystallized Composites

2000 ◽  
Vol 656 ◽  
Author(s):  
Makoto Nakanishi ◽  
Tomonori Shibuya ◽  
Tatsuo Fujii ◽  
Jun Takada
Keyword(s):  
Absorption Spectrum ◽  
Dielectric Loss ◽  
Grain Growth ◽  
Magnetic Loss ◽  
Wide Band ◽  
Granular Structure ◽  
Dielectric Losses ◽  
Zn Ferrite ◽  
Band Absorption ◽  
Ferrite Composites

ABSTRACTIn order to develop wide-band microwave absorbers we tried to prepare composite absorbers between the magnetic loss (Ni-Zn-ferrite) and the dielectric loss (SiC) materials. The dry or wet mixtures of Ni-Zn-ferrite and polycarbosilane (PCS) were cured in air and were then subjected to pyrolysis forming of the ferrite composites. The composites produced by the wet mixing had granular structure: the PCS surrounding the ferrite particles suppressed the sintering and the grain growth of the ferrite composites during pyrolysis. The matching frequency due to the magnetic loss linearly increased with increasing the PCS content. Moreover the ferrite/SiC hemi-crystallized composite cured at 473 K for 24 hours showed wide-band absorption spectrum having the both magnetic and dielectric losses.

Preparation and Performance of Chiral Polyaniline/Cobalt Ferrite Composites

2016 ◽  
Vol 852 ◽  
pp. 342-345
Author(s):  
Juan Bi Li ◽  
Di Qiong Hu ◽  
Yu Huan Wang ◽  
Liang Chao Li ◽  
Yan Ding
Keyword(s):  
Dielectric Loss ◽  
Cobalt Ferrite ◽  
In Situ Polymerization ◽  
Optical Rotation ◽  
Magnetic Loss ◽  
And Performance ◽  
Ferrite Composites ◽  
Co Precipitation ◽  
Polymerization Method

The cobalt ferrite and chiral polyaniline/cobalt ferrite composites were synthesized by co-precipitation and in-situ polymerization method, respectively. The crystal structure and composition, electrical conductivity, optical rotation, dielectric loss and magnetic loss of the as-prepared samples were researched. It was found that the optical rotation (levorotation) of composites is less than that of chiral polyaniline (L-PANI), and increased with the increasing of L-PANI content. The conductivity of the composites with a mass ratio of L-PANI to cobalt ferrite above 0.4 was better than of pure L-PANI, and their dielectric loss was in accordance with the conductivity in variation trend.

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