Synthesis and Characterization of MFe2O4(M=Co,Ni) Nanoparticles

De Hui Sun; Ji Lin Zhang; De Xin Sun

doi:10.4028/www.scientific.net/AMR.236-238.1893

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Synthesis and Characterization of MFe₂O₄(M=Co,Ni) Nanoparticles

Abstract:

The magnetic MFe₂O₄ (M=Co, Ni) nanoparticles are synthesized using a hydrothermal synthesis method in ethylene glycol (EG) solution. Their morphologies, structures, surface properties and magnetism are characterized by field emission scanning electron microscopy (FE-SEM), powder X-ray diffraction (XRD), fourier transform infrared (FTIR) absorption spectra, and vibrating sample magnetometer (VSM), respectively. The nickel ferrite and the cobalt ferrite samples are nearly spherical and homogeneous nanoparticles with average size range of about 90 nm (NiFe₂O₄) and 30 nm (CoFe₂O₄). XRD patterns confirm that the NiFe₂O₄ samples belong to the cubic structure and the CoFe₂O₄ samples are the rhombohedral structure. The NiFe₂O₄ nanoparticles are superparamagnetic at room temperature, while the CoFe₂O₄ nanoparticles are sub-ferromagnetic at room temperature and possess higher saturation magnetization.