Synthesis of nanoparticles of CoxFe(3−x)O4 by combustion reaction method |
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| Institution: | 1. Departamento de Matemática e Física, Universidade Católica de Goiás, Caixa Postal 86, 74605-0101 Goiânia, GO, Brazil;2. Intituto de Química, Universidade Federal de Goiás, 74001-970 Goiânia, GO, Brazil;3. Intituto de Física, Universidade Federal do Rio de Janeiro, 74001-970 Rio de Janeiro, RJ, Brazil;1. Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310, UTM Johor Bahru, Johor, Malaysia;2. Centre for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310, UTM Johor Bahru, Johor, Malaysia;3. Department of Chemistry, Nanoscience and Nanotechnology Research Center (NNRC), Razi University, Kermanshah, 67149, Iran;4. Environmental Biotechnology National Research Laboratory, School of Chemical Engineering, Chonbuk National University, Jeonju, 561-756, Republic of Korea;1. Laboratory of Ceramic Synthesis and Formulation, Federal University of São Carlos, São Carlos, SP, Brazil;2. Laboratory of Ceramic Materials, Federal University of Rio Grande do Sul, RS, Brazil;3. Faculdade de Ciências Aplicadas, Universidade Estadual de Campinas, Limeira, SP, Brazil;1. AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, 30-059 Kraków, Poland;2. RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, NY 11973, USA;3. Department of Physics, Western Michigan University, Kalamazoo, MI 49008, USA;1. Catalysis and Nanomaterials Research Laboratory, Department of Chemistry, Loyola College, Chennai 600034, India;2. Materials Division, School of Advanced Sciences, Vellore Institute of Technology (VIT) University, Chennai Campus, Chennai 600127, India;3. Department of Physics, College of Science, University of Bahrain, PO Box 32038, Bahrain;4. Nanotechnology Centre, University of Bahrain, PO Box 32038, Bahrain;1. Instituto de Física, Universidade Federal de Goiás, 74001-970 Goiânia-GO, Brazil;2. Instituto Federal de Goiás, 75131-500 Anápolis-GO, Brazil;3. Instituto de Química, Universidade Federal de Goiás, Goiânia-GO, Brazil |
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| Abstract: | Nanocrystalline magnetic particles of CoxFe(3−x)O4, with x ranging from 0.79 to 1.15, has been synthesised by combustion reaction method using iron nitrate Fe(NO3)3.9H2O, cobalt nitrate Co(NO3)2·6H2O, and urea CO(NH2)2 as fuel without template and subsequent heat treatment. The process is quite simple and inexpensive since it does not involve intermediate decomposition and/or calcining steps. The maximum reaction temperature ranged from 850 to 1010 °C and combustion lasted less then 30 s for all systems. X-ray diffraction patterns of all systems showed broad peaks consistent with cubic inverse spinel structure of CoFe2O4. The absence of extra reflections in the diffraction patterns of as-prepared materials ensures phase purity. The average crystallite sizes determined from the prominent (3 1 1) peak of the diffraction using Scherre's equation and TEM micrographs consisted of ca. 27 nm in spherical morphology. FTIR spectra of the as-prepared material showed traces of organic and metallic salts byproducts. However, when the same material was washed with deionised water the byproducts were rinsed off, resulting in pure materials. Magnetic properties such as saturation magnetisation, remanence magnetisation and coercivity field measured at room temperature were 48 emu/g, 15 emu/g and 900 Oe, respectively. |
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