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Particle thickness effect on electromagnetic properties of flake‐shaped FeNi alloy
Author(s) -
Li Wangchang,
Zhou Xiang,
Ying Yao,
Jiang Liqiang,
Che Shenglei
Publication year - 2015
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.201532459
Subject(s) - materials science , coercivity , calcination , scanning electron microscope , ball mill , alloy , microwave , reflection loss , composite material , diffraction , particle size , flake , composite number , analytical chemistry (journal) , optics , condensed matter physics , chemical engineering , biochemistry , chemistry , physics , engineering , quantum mechanics , catalysis , chromatography
In this paper, flake‐shaped Fe 50 Ni 50 alloy particles were prepared by mechanical ball milling and subsequent calcination method. The thickness of these particles was studied though different milling time and the electromagnetic (EM) properties were investigated in the frequency range of 30 MHz–1 GHz. The X‐ray diffraction (XRD) patterns were used to investigate the phase formation process with the calcination temperature and demonstrate that the Fe 50 Ni 50 solid solution formed when the particles were calcinated at 900 °C. The thicknesses of the flake‐shaped particles milled for 18, 20, 22, 24 h were about 3, 2.5, 2, and 1 µm, respectively, observed from the scanning electron microscopy (SEM) and backscattered electron (BSE). The maximum magnetization ( M max ) at the maximum field (12 kOe) and coercivity ( H c ) for the sample milled for 24 h is 111 emu g −1 and 56 Oe. The electromagnetic parameters and microwave absorbing properties are enhanced due to the thickness reduction. The results show that sample milled for 24 h has excellent EM wave absorbing properties and the peak frequency is located at 55 MHz with the reflection value of −39.0 dB for a thickness of d = 5 cm. The flake‐shaped particles are of high practical applications for EM interference/compatibility (EMI/EMC) in radio frequency.