Mössbauer and magnetic study of nanocrystalline strontium hexaferrite prepared by an ionic coordination reaction technique

Araújo, José Humberto de; Soares, João Maria; Ginani, Marconi Floripe; Machado, Fernando L. A.; Cunha, João Batista Marimon

Mössbauer and magnetic study of nanocrystalline strontium hexaferrite prepared by an ionic coordination reaction technique

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dc.contributor.author	Araújo, José Humberto de
dc.contributor.author	Soares, João Maria
dc.contributor.author	Ginani, Marconi Floripe
dc.contributor.author	Machado, Fernando L. A.
dc.contributor.author	Cunha, João Batista Marimon
dc.date.accessioned	2020-06-25T17:33:34Z
dc.date.available	2020-06-25T17:33:34Z
dc.date.issued	2013-10
dc.description.resumo	Hard-magnetic nanocrystalline strontium hexaferrites SrFe12O19 were synthesized using an ionic coordination reaction technique. In this sample preparation technique the biopolymer chitosan was used as a nanoreactor. The obtained precursor powders were calcined at temperatures in the range 600–900 °C. The samples were analyzed by X-ray diffraction, transmission electron microscopy, Mössbauer spectroscopy and vibrating sample magnetometry. A complementary study of X-ray Rietveld refinement and Mössbauer spectroscopy shown that the hexaferrite phase formation is accompanied by formation of maghemite and hematite as intermediate phases. It was found that hexaferrite is present in the samples calcined at and above 600 °C but it is fully developed at 900 °C. For this sample the average particle size was found to be 41.6 nm. Magnetization measurements yielded squared hysteresis loops with a magnetization ratio () of 0.58 and a coercive field of 6.48 kOe. The overall results indicated that the particles in these samples are in the single domain regime and that the magnetization reversal in these particles is mainly due to coherent rotation	pt_BR
dc.identifier.citation	ARAÚJO, J.H.; SOARES, J.M.; GINANI, M.F.; MACHADO, F.L.A.; CUNHA, J.B.M.. Mössbauer and magnetic study of nanocrystalline strontium hexaferrite prepared by an ionic coordination reaction technique. Journal of Magnetism and Magnetic Materials, v. 343, p. 203-207, 2013. Disponível em: https://www.sciencedirect.com/science/article/pii/S0304885313003077?via%3Dihub#! Acesso em: 23 jun. 2020. https://doi.org/10.1016/j.jmmm.2013.04.077.	pt_BR
dc.identifier.doi	10.1016/j.jmmm.2013.04.077
dc.identifier.issn	0304-8853
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29360
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	Sr-hexaferrite	pt_BR
dc.subject	Chemical synthesis	pt_BR
dc.subject	X-ray diffraction	pt_BR
dc.subject	Mössbauer spectroscopy	pt_BR
dc.subject	Magnetic property	pt_BR
dc.title	Mössbauer and magnetic study of nanocrystalline strontium hexaferrite prepared by an ionic coordination reaction technique	pt_BR
dc.type	article	pt_BR