期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 471, 期 -, 页码 561-567出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2018.09.095
关键词
Fe3Si nanocapsules; Amorphous C shell; Arc-discharge; Microwave absorption
资金
- Natural Science Foundation of China (NSFC) [51571195, 51871219, 51271178, 51331006, 51590883]
- National Key R&D Program of China [2017YFA0206301]
Nanoscale heterostructures, like core-shell structures, show attractive microwave-absorption characteristics because of the synergetic effects of their dielectric shells and soft-magnetic cores. A new type of nanocapsules with amorphous C shell encapsulating Heusler soft-magnetic Fe3Si alloy has been designed and synthesized in which Si atoms were doped in the C shell to effectively produce a large amount of Si-C bonds to induce the formation of an amorphous C shell. This further significantly improves the dielectric properties of C shells by enhanced dielectric polarization. These tailored Fe3Si/C nanocapsules, exhibit enhanced microwave-absorption properties because of the desirable impedance match between the amorphous C shell and the soft-magnetic Fe3Si. The optimal Fe3Si/C nanocapsules exhibit a highest absorption intensity of - 68.3 dB at 13 GHz and an absorption bandwidth of 4.6 GHz (for RL lower than -10 dB) for absorber thicknesses of 2.1 mm and 1.4 mm, respectively. This new type of nanocapsules is of potential interest for application as novel microwave-absorption material.
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