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Enhanced electromagnetic wave absorption property of binary ZnO/NiCo_(2)O_(4) composites

Journal of Advanced Ceramics 2021年第4期10卷 832-842页

作者： Bin DU Mei CAI Xuan WANG Junjie QIAN Chao HE Anze SHUI School of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China

Nowadays,metal oxide-based electromagnetic wave absorbing materials have aroused widely attentions in the application of telecommunication and electronics due to their selectable mechanical and outstanding dielectric properties.Herein,the binary ZnO/NiCo_(2)O_(4) nanoparticles were successfully synthesized via hydrothermal reaction and the electromagnetic wave absorption properties of the composites were investigated in detail.As a result,benefiting from the dielectric loss,the as-obtained ZnO/NiCo_(2)O_(4)-7 samples possessed a minimum reflection loss value of-33.49 dB at 18.0 GHz with the thickness of 4.99 mm.This work indicates that ZnO/NiCo_(2)O_(4) composites have the promising candidate applications in electromagnetic wave absorption materials in the future.

关键词： ZnO particles dielectric loss magnetic loss electromagnetic wave absorption

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Rational construction of graphene oxide with MOF- derived porous NiFe@C nanocubes for high-performance microwave attenuation

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Nano Research 2016年第12期9卷 3671-3682页

作者： Zhihong Yang Hualiang Lv Renbing WU College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 211100 China Department of Materials Science Fudan University Shanghai 200433 China

Exploring lightweight microwave attenuation materials with strong and tunable wideband microwave absorption is highly desirable but remains a significant challenge. Herein, three-dimensional （3D） porous hybrid composites consisting of NiFe nanoparticles embedded within carbon nanocubes decorated on graphene oxide （GO） sheets （NiFe@C nanocubes@GO） as high-performance microwave attenuation materials have been rationally synthesized. The 3D porous hybrid composites are fabricated by a simple method, which involves one-step pyrolysis of NiFe Prussian blue analogue nanocubes in the presence of GO sheets. Benefiting from the unique structural features that exhibit good magnetic and dielectric losses as well as a proper impedance match, the resulting NiFe@C nanocubes@GO composites show excellent microwave attenuation ability. With a minimum reflection loss （RL） of -51 dB at 7.7 GHz at a thickness of 2.8 mm and maximum percentage bandwidth of 38.6% for RL 〈 -10 dB at a thickness of 2.2 mm, the NiFe@C nanocubes@GO composites are superior to the previously reported state-of-the-art carbon-based microwave attenuation materials.

关键词： hybrid dielectric loss magnetic loss microwave attenuation

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Comparative Study of Dielectric and magnetic Properties of Selected 3D Reticulated Ceramics and Their Same Composition Ceramic Disks

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Journal of Materials Science & Technology 2003年第2期19卷 123-125页

作者： QingGONG ZhengFANG XiaomingCAO JinsongZHANG SchoolofChemistry&ChemicalEngineering CentralSouthUniversityChangsha410013China InstituteofMetalResearch ChineseAcademyofSciencesShenyang110016China

3-dimensional reticulated ceramics (3DRCs) and their same composition ceramic disks(SCCDs) were fabricated by sol-gel method, with the composition of SrO-6Fe203(30%), SiC(35%) and Ti02(35%), sintered at 1200C in N2. The dielectric and magnetic parameters of such 3DRCs and their SCCDs were measured respectively in a temperature range from room temperature to 800癈 and in a frequency range from 2.6 GHz to 18 GHz. The results showed that the dielectric and magnetic loss of 3DRCs were obviously larger than those of their SCCDs in a wide range of temperature and the whole range of measuring frequency. The increase of dielectric loss of SDRCs was much higher than that of magnetic loss compared to their SCCDs, which was found due to the 3D net structure extrinsic characteristics.

关键词： 3-dimentional reticulated ceramics Dielectric loss magnetic loss Extrinsic loss.

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Microwave-Absorbing Properties of La_(1-x)Sr_xMn_ (1-y)Fe_yO_3

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Journal of Rare Earths 2006年第3期24卷 313-313页

作者： Wang Da Zhou Kesheng Yin Lisong Chen Mintao Deng Jianjie School of Physics Science and Technology Central South University . Changsha 410083 China

The experiment samples of La1-xSrxMn1-y FeyO3（x = 0. 15, 0.20, 0.23; y = 0. 10, 0. 12, 0.14, 0.16） were prepared by sol-gel process, and the loss tangent and absorption coefficient in the range of 2 - 18 GHz were measured by HP8722 net analyzing apparatus. It is found that changing the content of Sr or Fe would effect the microwave absorbing. When the thickness of La1-x SrxMn1-y FeyO3 is 2 mm and x =0.20, y = 0.14, the capability of microwave absorbing is the best one. There are two absorption peaks; the maximum is 34 dB and effective band width with 10 dB and more reaches 6.2 GHz.

关键词： microwave absorbing materials magnetic loss dielectric loss rare earths

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