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Electromagnetic and oxidation resistance properties of core‐shell structure flaked carbonyl iron powder@SiO 2 nanocomposite
Author(s) -
Li Wangchang,
Le Cheng,
Lv Junjun,
Huang Wei,
Qiao Liang,
Zheng Jingwu,
Ying Yao,
Yu Jing,
Che Shenglei
Publication year - 2017
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201600747
Subject(s) - materials science , nanocomposite , fourier transform infrared spectroscopy , permittivity , scanning electron microscope , dielectric , thermogravimetric analysis , annealing (glass) , composite material , carbonyl iron , dielectric loss , chemical engineering , optoelectronics , engineering
The SiO 2 coated sphere and flaky carbonyl iron powders (CIPs) heterogeneous nanocomposites have been prepared through the Stöber method and subsequently, through an annealing process for eliminating the crystal defect and enhancing the insulation and oxidation resistance of SiO 2 shell. The CIP@SiO 2 heterogeneous nanocomposites were characterized by X‐ray diffraction (XRD), Fourier Transform infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), Thermogravimetric (TG) analysis and Vector Network Analyzer (VNA). The CIP surface had been successfully assembly‐coated with nano SiO 2 layer, obtained by the SEM, XRD, and FTIR. Both the annealing treatment and the SiO 2 shell can synergetically improve the oxidation resistance property due to the reduction of defects and residual stress, and isolation of oxygen, respectively. Changed everywhere permittivity (magnetic permeability) by effective permittivity (magnetic permeability). The real part of the permittivity of the nanocomposite decreased significantly, while the imaginary part of permittivity remained the same indicating the increase of dielectric loss. The permeability decreased slightly for the SiO 2 insulated shell blocking the magnetic path. Hence, the electromagnetic match property was greatly improved by coating SiO 2 insulated shell, and this composite showed a broad absorption band.