Correlation between coercive field and radiation attenuation in Ni and Mg ferrite doped with Mn and Co

Araújo, José Humberto de; Silva, José Eves Mendes; Nasar, Ricardo Silveira; Nasar, Marinalva Cerqueira; Firme, Caio Lima

Correlation between coercive field and radiation attenuation in Ni and Mg ferrite doped with Mn and Co

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dc.contributor.author	Araújo, José Humberto de
dc.contributor.author	Silva, José Eves Mendes
dc.contributor.author	Nasar, Ricardo Silveira
dc.contributor.author	Nasar, Marinalva Cerqueira
dc.contributor.author	Firme, Caio Lima
dc.date.accessioned	2020-06-30T17:49:31Z
dc.date.available	2020-06-30T17:49:31Z
dc.date.issued	2015-11-15
dc.description.abstract	I	pt_BR
dc.description.resumo	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	pt_BR
dc.identifier.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: https://www.sciencedirect.com/science/article/pii/S0304885315302304?via%3Dihub#! Acesso em: 23 jun. 2020. https://doi.org/10.1016/j.jmmm.2015.06.014	pt_BR
dc.identifier.doi	10.1016/j.jmmm.2015.06.014
dc.identifier.issn	0304-8853
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29390
dc.language	en	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Spinel ferrit	pt_BR
dc.subject	Citrate precursors	pt_BR
dc.subject	Magnetic material	pt_BR
dc.subject	Radar absorbing material	pt_BR
dc.subject	Ferrimagnetic materials	pt_BR
dc.subject	Magnetic coercivity	pt_BR
dc.subject	reflectivity	pt_BR
dc.title	Correlation between coercive field and radiation attenuation in Ni and Mg ferrite doped with Mn and Co	pt_BR
dc.type	article	pt_BR