Preparation of Ultrafine Ni-Fe Composite Particles by Microemulsion

Abstract

Abstract: Nanoparticles of Ni-Fe composite were prepared with the W/O microemulsion method. The investigations by XRD, IR and TEM show the ultrafine particles
are coated by surfactants. Their average sizes are less than 30nm and their densities about 2.89g/cm³, the specific saturation magnetization σ_s=13～16Am²/kg, the coercivity H_c=87～123Oe
and the residual magnetism B_r=2.25～3.00Am²/kg. The coercivity and residual magnetism are much higher, it is shown that the complex
supermicropowders have hard magnetic properties. The analysis by X-ray energy spectroscopy shows that part of Ni-Fe has formed alloy phases. Magneticrheological
(MR) effect of the MR fluid prepared from the ultrafine particles is superior and the subsidence stability of the MRF is excellent.

Key words: microemulsion, Ni-Fe composite particles, ultrafine particle, XRD, TEM

CLC Number:

TM214

ZHANG Chao-Ping,DENG Wei,HU Lin,LUO Yu-Ping,HU Zong-Chao,GAO Xiang,SHEN De-Jun. Preparation of Ultrafine Ni-Fe Composite Particles by Microemulsion[J]. Journal of Inorganic Materials.

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Preparation of Ultrafine Ni-Fe Composite Particles by Microemulsion

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