Magnetic nanocomposites: preparation and characterization of Co-ferrite nanoparticles in a silica matrix

Magnetic nanocomposites of Co-ferrite nanoparticles dispersed in silica matrix (CoFe 2O 4/SiO 2) have been prepared by the sol–gel technique using tetraethylorthosilicate (TEOS) as precursor of silica, and metallic nitrates as precursors of ferrite. Samples prepared in powder form have been dried at...

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Bibliographic Details
Published in:Journal of alloys and compounds 2004-04, Vol.369 (1), p.148-151
Main Authors: Garcı&#x0301, a-Cerda, L.A., Torres-Garcı&#x0301, a, V.A., Matutes-Aquino, J.A., Ayala-Valenzuela, O.E.
Format: Article
Language:English
Subjects:
Cobalt ferrite
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic measurements
Magnetic properties and materials
Nanocomposite materials
Physics
Silica
Sol–gel process
X-ray diffraction
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Summary:Magnetic nanocomposites of Co-ferrite nanoparticles dispersed in silica matrix (CoFe 2O 4/SiO 2) have been prepared by the sol–gel technique using tetraethylorthosilicate (TEOS) as precursor of silica, and metallic nitrates as precursors of ferrite. Samples prepared in powder form have been dried at 100 °C for 3 h and calcined for 2 h at temperatures between 500 and 1000 °C. Co-ferrite particles were formed in the matrix pores and the nucleation of these particles was observed with the increase in the calcining temperature. TEM measurements showed that the nanoparticles had a fairly uniform morphology and an average particle size of approximately 5 nm. The combination of different Co-ferrite concentrations and calcining temperatures allowed to obtain samples with saturation magnetization ranging from 0.7 to 21.8 emu/g.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2003.09.089