Author： Zhao Lijun Yang Hua Cui Yuming Zhao Xueping Feng Shouhua
Publisher： Springer Publishing Company
ISSN： 0022-2461
Source： Journal of Materials Science, Vol.42, Iss.11, 2007-06, pp. : 4110-4114
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Abstract
The structure and the magnetic properties of silica-coated cobalt ferrite nanoparticles (80 wt% CoFe2O4), prepared by sol–gel method and submitted to thermal treatments in the range 800–1,000 °C, were investigated through XRD, FT-IR, TEM and VSM. The effects of thermal treatment temperatures on the structure and magnetic properties of nanoparticles were examined. A silica shell thickness of about 5 nm was synthesized on top of cobalt ferrite nanoparticles. The non-crystalline silica confines the growth of cobalt ferrite nanoparticles, i.e., the particle sizes are almost independent of the thermal treatment. Saturation magnetization (Ms) was decreased slightly and coercivity (Hc) was increased, when the non-crystalline silica was coated on the surface of cobalt ferrite nanoparticles.
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