| 1 | Magnetic and microwave absorption properties of Ni_(1-x)Zn_xFe_2O_4 nanocrystalline synthesized by sol-gel method显示文摘Ni1-xZnxFe2O4(0≤x≤1,in steps of 0.1) nanocrystallines were synthesized by sol-gel route.The doping effects of zinc on structural,magnetic and microwave absorption properties were investigated in detail.X-ray diffraction(XRD) results show that all the samples are single-phase spinel structure.The magnetic and microwave absorption properties are strongly dependent on the zinc content,which can be understood in terms of the cations redistribution in spinel tetrahedral and octahedral sites with the increase of zinc content.The magnetic measurement shows the antiferromagnetic nature of the samples for x=0.9 and x=1.0.The saturation magnetization reaches the maximum of 3.35μB/f.u.at x=0.5.The optimal reflection loss(RL) of-29.6 dB is found at 6.5 GHz for an absorber thickness of 5 mm.The RL values exceeding 10 dB are obtained for the absorber in the range of 3.9-8.9 GHz.These Ni1-xZnxFe2O4 nanocrystallines may be attractive candidates for electromagnetic wave absorption materials. | ZHANG Min LIU QiangChun ZI ZhenFa DAI YuQiang ZHU XueBin SUN YuPing DAI JianMing | 2013 | Science China(Technological Sciences)2013，56，1： | 4 |
| 3 | Promoting the microwave absorption performance of hierarchical CF@NiO/Ni composites via phase and morphology evolution显示文摘Lightweight and efficient carbon-based microwave absorbents are significant in addressing the increasing severity of electromagnetic pollution.In this study,hierarchical NiO/Ni nanosheets with a tuneable phase and morphology supported on a carbon fiber substrate(CF@NiO/Ni)were fabricated using a hydrothermal approach and post-annealing treatment.As the annealing temperature increases,more metallic Ni is formed,and an apparent porosity appears on the sheet surface.Benefiting from the advantages of a three-dimensional(3D)conducting network,hierarchical porous structure,reinforced dipole/interface polarization,multiple scattering,and good impedance matching,the CF@NiO/Ni-500 composite exhibits an excellent microwave absorption performance even at a filling rate of only 3wt%.Specifically,its minimal reflection loss is-43.92 dB,and the qualified bandwidth is up to 5.64 GHz.In addition,the low radar cross-section area of the CF@NiO/Ni composite coating confirms its strong ability to suppress electromagnetic wave scattering.We expect that this work could contribute to a deeper understanding of the phase and morphology evolution in enhancing microwave absorption. | Shipeng Wang Ziyan Liu Qiangchun Liu Baojun Wang Wei Wei Hao Wu Zijie Xu Shikuo Li Fangzhi Huang Hui Zhang | 2023 | International Journal of Minerals,Metallurgy and Materials2023，30，3： | 0 |
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