An investigation on synthesis and magnetic properties of nanoparticles of Cobalt Ferrite coated with SiO2

Document Type : Reasearch Paper

Authors

• S. Rostamzadehmansoor
• M. S. Sadjadi
• K. Zare

Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran.

10.7508/ijnd.2013.01.006

Abstract

SiO₂-coated Cobalt Ferrite (CoFe₂O₄) nanoparticles were obtained by the hydrolysis of tetraethylorthosilicate in the presence of CoFe₂O₄ nanoparticles in co-precipitation. The effects of SiO₂coating on the magnetic properties of CoFe₂O₄ nanoparticles were investigated. The structural, morphological and magnetic properties of as-prepared sample were characterization by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectra, transmission electron microscopy (TEM), Field emission scanning electron microscopy/energy dispersive x-ray analysis (FESEM-EDAX) and magnetic measurements were investigated using vibrating sample magnetometer (VSM). The morphology analysis confirmed that the obtained composite nanoparticles consisted of CoFe₂O₄ coated by SiO₂. It was shown that the saturation magnetization and coercivity of CoFe₂O₄ decreased after SiO₂ coating, which can be interpreted by the interparticle dipole-dipole interactions related to the magnetic particle volume fraction in the composite nanoparticles.

Keywords

• Synthesis
• Magnetic Properties
• SiO2-coated cobalt ferrite
• nanoparticles
• X-ray diffraction (XRD)
• Energy dispersive

20.1001.1.20088868.2013.4.1.6.5

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