Magnetic properties of cobalt ferrite/SiO2 nanocomposite |
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| Affiliation: | 1. Centro de Investigación y Tecnología Química (CITeQ) (UTN-CONICET), Facultad Regional Córdoba, Maestro López y Cruz Roja Argentina, Ciudad Universitaria, 5016 Córdoba, Argentina;2. Unidad de Investigación y Desarrollo en Tecnología Farmacéutica, UNITEFA CONICET-UNC, Departamento de Farmacia, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina;3. Facultad de Matemática, Astronomía y Física, Universidad Nacional de Córdoba – IFEG, CONICET. Ciudad Universitaria, 5000 Córdoba, Argentina |
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| Abstract: | Nanocrystalline cobalt ferrite dispersed in silica was prepared by mechanical alloying and subsequent heat-treatment. For Co-ferrite with 15 wt% silica, a high coercivity of up to 3.3 kOe and a magnetization of 68 emu/g were obtained after an optimized heat treatment (in air at 900°C). Experiments were conducted to study the optimum amount of silica required to obtain optimum magnetic properties. It was found that a small amount of 4.5 wt% silica (SiO2) allows the composite to possess good magnetic properties (coercivity of 3 kOe and saturation magnetization of 72 emu/g). |
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