Evaluation of (BH)max and magnetic anisotropy of cobalt ferrite nanoparticles synthesized in gelatin

Detalhes bibliográficos
Autor(a) principal: Araújo, José Humberto de
Data de Publicação: 2015
Outros Autores: Lima, Aldenir Cavalcanti, Torres, Marco Morales, Soares, João Maria, Melo, Daniel Macedo A., Carriço, Artur da Silva
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRN
Texto Completo: https://repositorio.ufrn.br/jspui/handle/123456789/29391
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
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spelling Araújo, José Humberto deLima, Aldenir CavalcantiTorres, Marco MoralesSoares, João MariaMelo, Daniel Macedo A.Carriço, Artur da Silva2020-06-30T18:03:29Z2020-06-30T18:03:29Z2015-11LIMA, 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.2015.05.1480272-8842https://repositorio.ufrn.br/jspui/handle/123456789/2939110.1016/j.ceramint.2015.05.148ElsevierGelatinCoFe2O4Mössbauer spectroscopyMagnetic propertiesNanoparticlesAnisotropy constantEvaluation of (BH)max and magnetic anisotropy of cobalt ferrite nanoparticles synthesized in gelatininfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleCoFe2O4 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 samplesengreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNinfo:eu-repo/semantics/openAccessLICENSElicense.txtlicense.txttext/plain; charset=utf-81484https://repositorio.ufrn.br/bitstream/123456789/29391/3/license.txte9597aa2854d128fd968be5edc8a28d9MD53TEXTEvaluationof(BH)maxandMagnetic_Araujo_015.pdf.txtEvaluationof(BH)maxandMagnetic_Araujo_015.pdf.txtExtracted texttext/plain21747https://repositorio.ufrn.br/bitstream/123456789/29391/4/Evaluationof%28BH%29maxandMagnetic_Araujo_015.pdf.txt99357910830384b55f5b176cf0ca3c64MD54THUMBNAILEvaluationof(BH)maxandMagnetic_Araujo_015.pdf.jpgEvaluationof(BH)maxandMagnetic_Araujo_015.pdf.jpgGenerated Thumbnailimage/jpeg1750https://repositorio.ufrn.br/bitstream/123456789/29391/5/Evaluationof%28BH%29maxandMagnetic_Araujo_015.pdf.jpgad58e723d74a5c651bf04843efce81f6MD55123456789/293912023-01-30 19:20:54.872oai:https://repositorio.ufrn.br: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Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2023-01-30T22:20:54Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false
dc.title.pt_BR.fl_str_mv Evaluation of (BH)max and magnetic anisotropy of cobalt ferrite nanoparticles synthesized in gelatin
title Evaluation of (BH)max and magnetic anisotropy of cobalt ferrite nanoparticles synthesized in gelatin
spellingShingle Evaluation of (BH)max and magnetic anisotropy of cobalt ferrite nanoparticles synthesized in gelatin
Araújo, José Humberto de
Gelatin
CoFe2O4
Mössbauer spectroscopy
Magnetic properties
Nanoparticles
Anisotropy constant
title_short Evaluation of (BH)max and magnetic anisotropy of cobalt ferrite nanoparticles synthesized in gelatin
title_full Evaluation of (BH)max and magnetic anisotropy of cobalt ferrite nanoparticles synthesized in gelatin
title_fullStr Evaluation of (BH)max and magnetic anisotropy of cobalt ferrite nanoparticles synthesized in gelatin
title_full_unstemmed Evaluation of (BH)max and magnetic anisotropy of cobalt ferrite nanoparticles synthesized in gelatin
title_sort Evaluation of (BH)max and magnetic anisotropy of cobalt ferrite nanoparticles synthesized in gelatin
author Araújo, José Humberto de
author_facet Araújo, José Humberto de
Lima, Aldenir Cavalcanti
Torres, Marco Morales
Soares, João Maria
Melo, Daniel Macedo A.
Carriço, Artur da Silva
author_role author
author2 Lima, Aldenir Cavalcanti
Torres, Marco Morales
Soares, João Maria
Melo, Daniel Macedo A.
Carriço, Artur da Silva
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Araújo, José Humberto de
Lima, Aldenir Cavalcanti
Torres, Marco Morales
Soares, João Maria
Melo, Daniel Macedo A.
Carriço, Artur da Silva
dc.subject.por.fl_str_mv Gelatin
CoFe2O4
Mössbauer spectroscopy
Magnetic properties
Nanoparticles
Anisotropy constant
topic Gelatin
CoFe2O4
Mössbauer spectroscopy
Magnetic properties
Nanoparticles
Anisotropy constant
description 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
publishDate 2015
dc.date.issued.fl_str_mv 2015-11
dc.date.accessioned.fl_str_mv 2020-06-30T18:03:29Z
dc.date.available.fl_str_mv 2020-06-30T18:03:29Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.citation.fl_str_mv 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
dc.identifier.uri.fl_str_mv https://repositorio.ufrn.br/jspui/handle/123456789/29391
dc.identifier.issn.none.fl_str_mv 0272-8842
dc.identifier.doi.none.fl_str_mv 10.1016/j.ceramint.2015.05.148
identifier_str_mv 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
0272-8842
10.1016/j.ceramint.2015.05.148
url https://repositorio.ufrn.br/jspui/handle/123456789/29391
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFRN
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instname_str Universidade Federal do Rio Grande do Norte (UFRN)
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