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https://repositorio.ufrn.br/handle/123456789/29391| Título: | Evaluation of (BH)max and magnetic anisotropy of cobalt ferrite nanoparticles synthesized in gelatin |
| Autor(es): | Araújo, José Humberto de Lima, Aldenir Cavalcanti Torres, Marco Morales Soares, João Maria Melo, Daniel Macedo A. Carriço, Artur da Silva |
| Palavras-chave: | Gelatin;CoFe2O4;Mössbauer spectroscopy;Magnetic properties;Nanoparticles;Anisotropy constant |
| Data do documento: | Nov-2015 |
| Editor: | Elsevier |
| Referência: | LIMA, A.C.; MORALES, M.A.; ARAÚJO, J.H.; SOARES, J.M. ; MELO, D.M.A.; CARRIÇO, A.S.. Evaluation of (BH)max and magnetic anisotropy of cobalt ferrite nanoparticles synthesized in gelatin. Ceramics International, v. 41, p. 22-28, 2015. Disponível em: https://www.sciencedirect.com/science/article/pii/S0272884215010937?via%3Dihub#! Acesso em: 25 jun 2020. https://doi.org/10.1016/j.ceramint.2015.05.148 |
| Resumo: | CoFe2O4 nanoparticles were synthesized using gelatin as a polymerizing agent. Structural, morphological and magnetic properties of samples treated at different temperatures were investigated by X-ray diffraction, scanning electron microscopy, Mössbauer spectroscopy and magnetization measurements. Our results revealed that the samples annealed at 623 K and temperatures above 973 K have a cation distributions given by (Co0.19Fe0.81)[Co0.81Fe1.19]O4 and (Co0.06Fe0.94)[Co0.94Fe1.06]O4, respectively. The particle sizes varied from 73 to 296 nm and the magnetocrystalline anisotropy, K1, has values ranging from 2.60×106 to 2.71×106 J/m3, as determined from the law of approach to saturation applied to the M×H data at high field. At 5 K, the saturation magnetization, coercive field and (BH)max varied from 76 to 95 Am2/kg, 479.9 to 278.5 kA/m and 9.7 to 20.9 kJ/m3, respectively. The reported values are in good agreement with near-stoichiometric cobalt ferrite samples |
| URI: | https://repositorio.ufrn.br/jspui/handle/123456789/29391 |
| ISSN: | 0272-8842 |
| Aparece nas coleções: | CCET - DFTE - Artigos publicados em periódicos |
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