Sol-gel preparation and characterization of CoFe2O4-SiO2 nanocomposites |
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Authors: | Xiang-Hui Huang Zhen-Hua Chen |
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Institution: | College of Materials Science and Engineering, Hunan University, Changsha 410082, China |
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Abstract: | Magnetic nanocomposites formed by cobalt ferrite particles dispersed in a silica matrix were prepared by a sol-gel process. The effects of the thermal treatment temperature and the salt concentration on the structural and magnetic properties of the composites were investigated. By controlling these parameters, CoFe2O4/SiO2 nanocomposites with different crystallite size and magnetic properties were obtained. By increasing the annealing temperature and salt concentration, composites with a progressive increase in the coercive field and of the density of magnetization were produced. In particular, a nanocomposite, with a Fe/Si molar concentration of 21%, obtained by drying the gel at 150 °C and further annealing at 800 °C, has a coercivity of 2000 Oe, which is more than twice higher than the coercivity of bulk cobalt ferrite. |
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Keywords: | 71 55 Jv 72 80 Tm 74 25 Ha 75 50 Dd |
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