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Title: Correlation between coercive field and radiation attenuation in Ni and Mg ferrite doped with Mn and Co
Authors: Araújo, José Humberto de
Silva, José Eves Mendes
Nasar, Ricardo Silveira
Nasar, Marinalva Cerqueira
Firme, Caio Lima
Keywords: Spinel ferrit;Citrate precursors;Magnetic material;Radar absorbing material;Ferrimagnetic materials;Magnetic coercivity;reflectivity
Issue Date: 15-Nov-2015
Publisher: Elsevier
Citation: SILVA, J.E. M.; NASAR, R. S. ; NASAR, M. C. ; FIRME, C. L.; Araújo, J. H.. Correlation between coercive field and radiation attenuation in Ni and Mg ferrite doped with Mn and Co. Journal of Magnetism and Magnetic Materials, v. 394, p. 274-279, 2015. Disponível em:! Acesso em: 23 jun. 2020.
Portuguese Abstract: It was investigated NiMg0.1MxFe2O4 ferrite where M stands for Mn, Co or simultaneously Mn and Co dopants. The concentration of M is 0.1 and it was divided by two in the sample with addition of Mn and Co. It was used the method of citrate precursors with 1100 °C calcination. The materials were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) and reflectivity measures by waveguide method. The X-ray diffraction measures, with Rietveld refinement, present average crystallite sizes between 0.576 and 0.626 µm. The SEM analysis shows clustered particles smaller than 1 µm at 1100 °C, in agreement with Rietveld refinement. The compositions with Mn reach magnetization between 42.09 and 53.20 Am2/kg, which does not generate high microwave absorption. The 0.1 Co addition reached greater coercivity (2.96×10−2 T), with up to 84% reflectivity at 10.17 GHz frequency. The Co material has high magnetocrystalline anisotropy, which is associated with the increase of coercive field, Hc. The higher coercivity optimizes the reflectivity results
Abstract: I
ISSN: 0304-8853
Appears in Collections:CCET - DFTE - Artigos publicados em periódicos

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