Dependence of structural and magnetic properties of CoFe2O4/SiO2 nanocomposites on annealing temperature and component ratio |
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| Affiliation: | 1. Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, Department of Materials and Chemistry Engineering, Guilin University of Technology, Jiangan Road 12, Guilin 541004, PR China;2. School of Science, Beijing University of Chemical Technology, Beisanhuan East Road 15, Beijing 100029, China;3. Foreign Language Department, Guilin University of Technology, Jiangan Road 12, Guilin 541004, PR China;4. Department of Physics and Laboratory of Materials Physics, Zhengzhou University, Daxue Road 75, Zhengzhou 450052, PR China;1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. School of Resources and Environmental Engineering, Pan Zhihua University, Pan Zhihua 617000, China;1. Dhote Bandhu Science College, Gondia 441614, India;2. Chintamani Science College, Pombhurna, Chandrapur 441224, India |
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| Abstract: | Cobalt ferrite (CoFe2O4) nanoparticles embedded in amorphous silica can be synthesized by using tetraethylorthosilicate (TEOS) and metallic nitrates as precursors. A well-established silica matrix network provides nucleation locations for CoFe2O4 nanoparticles, thus confining their growth and aggregation. The structural and magnetic properties show strong dependence on the variation of particle size caused by annealing temperature and CoFe2O4 ratio, resulting in higher crystallization, saturation magnetization Ms and remanent magnetization Mr as the annealing temperature and CoFe2O4 ratio increase. But the variation of coercivity Hc is not in accordance with that of Ms and Mr, indicating that Hc is not determined by the size of CoFe2O4 nanoparticles only. The realization of the adjustable particle sizes and the controllable magnetic properties makes the applicability of CoFe2O4 even more versatile. |
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