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Yan S.J.,Harbin Institute of Technology | Yan S.J.,Aerospace Research Institute of Materials And Processing Technology | Yan S.J.,Aviation Key Laboratory of Science and Technology on Stealth Materials | Yan S.J.,University of Wyoming | And 6 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2014

C@FeNi3 core/shell structured microchains with an average diameter of 400 nm and lengths of about tens microns were synthesized by a simple hydrothermal method. The morphologies, microstructures and electromagnetic properties were investigated by means of scanning electron microscope, transmission electron microscopee, X-ray diffraction, Raman spectroscopy, physical property measurement system and vector network analyzer. C@FeNi3 core/shell structured microchains were constructed by FeNi3 alloy submicron spheres with average diameter of 350 nm and carbon shell with thickness about 50 nm. Their electromagnetic properties were investigated in the 2-18 GHz frequency range. The permittivity presented strong dielectric relaxation behavior over 11.5-18 GHz, corresponding to Debye dipolar relaxation. The permeability was found to have negative imaginary parts within 11.5-18 GHz. Strong dual-frequency absorption behavior was observed in the Ku-band due to consequence of interface relaxation. © 2013 Elsevier B.V. Source


Yan S.J.,Aerospace Research Institute of Materials And Processing Technology | Yan S.J.,Aviation Key Laboratory of Science and Technology on Stealth Materials | Dai S.L.,Aerospace Research Institute of Materials And Processing Technology | Ding H.Y.,Aviation Key Laboratory of Science and Technology on Stealth Materials | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2014

Ni and Co metallic microparticles with submicron size were synthesized with a simple wet chemical reduction method at a relatively low temperature. Then their morphologies and structures were characterized by SEM and XRD. Ni metallic microparticles have spherical-shape morphology with fcc crystalline structure, however, Co has a distinct leaf-like morphology with the fcc and hcp mixed phases crystalline structures. For the characterization of their electromagnetic properties, paraffin matrix composites containing different molar ratio Ni and Co mixture powder as fillers were prepared. It was found that both the electromagnetic properties and electromagnetic microwave absorption performances of absorber layer were remarkably influenced by Ni/Co molar ratio. The electromagnetic microwave absorption performances were significantly improved by blending Ni and Co metallic microparticles into paraffin matrix with changing Ni/Co molar ratio, and enhanced mechanism were discussed. © 2014 Elsevier B.V. Source

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