Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da UFPB |
Texto Completo: | https://repositorio.ufpb.br/jspui/handle/tede/7150 |
Resumo: | The work consisted in the synthesis of ferrites of composition Ni0,5-xNdxZn0,5Fe2O4 varying the concentration of neodymium ions (Nd3+) for 0 ≤ x ≤ 0.3, the method being chosen as the citrate precursor method or route of synthesis. After synthesis, the samples were calcined at 350°C and then pressed into discs and toroids. Subsequently these samples were sintered at 1000°C for 3 hours, the rate being controlled heating and cooling. The calcined materials were characterized by XRD, SEM and vibrating sample magnetometry (MAV) and sintered samples by XRD, SEM, MAV, and measures of permeability and magnetic losses. The method of the precursor citrate has been demonstrated to be an effective method because obtained structural materials with desirable features. From XRD and the Rietveld refinement, it was found that the synthesized samples and treated at 350°C showed 100% formation of the single phase of spinel type and treated at 1000°C showed besides the ferrite phase, secondary phase confirmed by refinement as NdFeO3. The samples treated at 1000°C for 3 hours have passed the dimensions in micrometers due to the diffusion effect between the crystals, which increases at higher temperatures. The synthesized and treated at 350 and 1000°C for 3 hours ferrites behave as magnetically "soft" or "soft" and intensity of saturation magnetization decreases with the increase in the samples of neodymium (Nd3+) materials. The proof of this decrease was demonstrated by the study of positioning of cations in the spinel network using the Rietveld refinement method, and the influence of these changes in the magnetic properties, from the comparative relationship between the magnetization values in terms of the Bohr magneton theoretical (MBTeórico) and experimental Bohr (MBExp.). The results of electrical tests of the synthesized samples showed that the materials developed have potential for miniaturization for applications in electronic devices such as inductive microwave in telecom cores |
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Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+study of the structure and properties of magnetic and electrical ferrites ni2+ / zn2+ doped with nd3+FerritaCitrato precursorNeodímioFerriteCitrate precursorNeodymiumCIENCIAS EXATAS E DA TERRA::QUIMICAThe work consisted in the synthesis of ferrites of composition Ni0,5-xNdxZn0,5Fe2O4 varying the concentration of neodymium ions (Nd3+) for 0 ≤ x ≤ 0.3, the method being chosen as the citrate precursor method or route of synthesis. After synthesis, the samples were calcined at 350°C and then pressed into discs and toroids. Subsequently these samples were sintered at 1000°C for 3 hours, the rate being controlled heating and cooling. The calcined materials were characterized by XRD, SEM and vibrating sample magnetometry (MAV) and sintered samples by XRD, SEM, MAV, and measures of permeability and magnetic losses. The method of the precursor citrate has been demonstrated to be an effective method because obtained structural materials with desirable features. From XRD and the Rietveld refinement, it was found that the synthesized samples and treated at 350°C showed 100% formation of the single phase of spinel type and treated at 1000°C showed besides the ferrite phase, secondary phase confirmed by refinement as NdFeO3. The samples treated at 1000°C for 3 hours have passed the dimensions in micrometers due to the diffusion effect between the crystals, which increases at higher temperatures. The synthesized and treated at 350 and 1000°C for 3 hours ferrites behave as magnetically "soft" or "soft" and intensity of saturation magnetization decreases with the increase in the samples of neodymium (Nd3+) materials. The proof of this decrease was demonstrated by the study of positioning of cations in the spinel network using the Rietveld refinement method, and the influence of these changes in the magnetic properties, from the comparative relationship between the magnetization values in terms of the Bohr magneton theoretical (MBTeórico) and experimental Bohr (MBExp.). The results of electrical tests of the synthesized samples showed that the materials developed have potential for miniaturization for applications in electronic devices such as inductive microwave in telecom coresCoordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESO trabalho consistiu na síntese de ferritas de composição Ni0,5-xNdxZn0,5Fe2O4 variando a concentração dos íons neodímio (Nd3+) de 0 ≤ x ≤ 0,3, sendo escolhido o método do citrato precursor como método ou rota de síntese. Após a síntese, as amostras obtidas foram calcinadas na temperatura de 350°C e depois prensadas em forma de pastilhas e toróides. Posteriormente estas amostras foram sinterizadas a 1000ºC durante 3 horas, sendo controlado a velocidade de aquecimento e de resfriamento. Os materiais calcinados obtidos foram caracterizados por DRX, MEV e magnetometria de amostra vibrante (MAV) e as amostras sinterizadas por DRX, MEV, MAV, e medidas de permeabilidade e perdas magnéticas. O método do citrato precursor demonstrou-se ser um método eficiente, pois obtivemos materiais com aspectos estruturais desejáveis. A partir das análises de DRX e do refinamento pelo método de Rietveld, verificou-se que as amostras sintetizadas e tratadas a 350ºC apresentaram formação de 100% de fase única do tipo espinélio e as tratadas a 1000ºC apresentaram além da fase ferrita, uma fase secundária, confirmada pelo refinamento como sendo NdFeO3. As amostras tratadas a 1000ºC por 3 horas passaram a possuir dimensões em micrômetros, devido ao efeito de difusão entre os cristais, que aumenta em altas temperaturas. As ferritas sintetizadas e tratadas a 350 e 1000ºC por 3 horas comportaram-se como materiais magneticamente macios ou moles e com intensidade da magnetização de saturação diminuindo nas amostras com o incremento de neodímio (Nd3+). A comprovação desta diminuição foi demonstrada pelo estudo de posicionamento dos cátions na rede espinélio, utilizando o refinamento do método de Rietveld, e da influência destas mudanças nas propriedades magnéticas, a partir da relação comparativa entre os valores de magnetização em termos de magnéton de Bohr teórico (MBTeórico) e de Bohr experimental (MBExp.). Os resultados das análises elétricas das amostras sintetizadas apresentaram que os materiais obtidos possuem potencialidades de miniaturização para aplicações como núcleos indutivos em dispositivos eletrônicos de micro-ondas na área de telecomunicaçõesUniversidade Federal da ParaíbaBRQuímicaPrograma de Pós-Graduação em QuímicaUFPBAraújo, Mário César Ugulino dehttp://lattes.cnpq.br/7281739070942782Oliveira, João Bosco Lucena dehttp://lattes.cnpq.br/1360004695124740Gomes Filho, Alberto Correia2015-05-14T13:21:39Z2018-07-21T00:31:02Z2014-11-072018-07-21T00:31:02Z2014-08-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfGOMES FILHO, Alberto Correia. Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+. 106 f. Tese (Doutorado em Química) - Universidade Federal da Paraíba, João Pessoa, 2014.https://repositorio.ufpb.br/jspui/handle/tede/7150porinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações da UFPBinstname:Universidade Federal da Paraíba (UFPB)instacron:UFPB2018-09-06T02:46:29Zoai:repositorio.ufpb.br:tede/7150Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufpb.br/PUBhttp://tede.biblioteca.ufpb.br:8080/oai/requestdiretoria@ufpb.br|| diretoria@ufpb.bropendoar:2018-09-06T02:46:29Biblioteca Digital de Teses e Dissertações da UFPB - Universidade Federal da Paraíba (UFPB)false |
dc.title.none.fl_str_mv |
Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+ study of the structure and properties of magnetic and electrical ferrites ni2+ / zn2+ doped with nd3+ |
title |
Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+ |
spellingShingle |
Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+ Gomes Filho, Alberto Correia Ferrita Citrato precursor Neodímio Ferrite Citrate precursor Neodymium CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+ |
title_full |
Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+ |
title_fullStr |
Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+ |
title_full_unstemmed |
Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+ |
title_sort |
Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+ |
author |
Gomes Filho, Alberto Correia |
author_facet |
Gomes Filho, Alberto Correia |
author_role |
author |
dc.contributor.none.fl_str_mv |
Araújo, Mário César Ugulino de http://lattes.cnpq.br/7281739070942782 Oliveira, João Bosco Lucena de http://lattes.cnpq.br/1360004695124740 |
dc.contributor.author.fl_str_mv |
Gomes Filho, Alberto Correia |
dc.subject.por.fl_str_mv |
Ferrita Citrato precursor Neodímio Ferrite Citrate precursor Neodymium CIENCIAS EXATAS E DA TERRA::QUIMICA |
topic |
Ferrita Citrato precursor Neodímio Ferrite Citrate precursor Neodymium CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
The work consisted in the synthesis of ferrites of composition Ni0,5-xNdxZn0,5Fe2O4 varying the concentration of neodymium ions (Nd3+) for 0 ≤ x ≤ 0.3, the method being chosen as the citrate precursor method or route of synthesis. After synthesis, the samples were calcined at 350°C and then pressed into discs and toroids. Subsequently these samples were sintered at 1000°C for 3 hours, the rate being controlled heating and cooling. The calcined materials were characterized by XRD, SEM and vibrating sample magnetometry (MAV) and sintered samples by XRD, SEM, MAV, and measures of permeability and magnetic losses. The method of the precursor citrate has been demonstrated to be an effective method because obtained structural materials with desirable features. From XRD and the Rietveld refinement, it was found that the synthesized samples and treated at 350°C showed 100% formation of the single phase of spinel type and treated at 1000°C showed besides the ferrite phase, secondary phase confirmed by refinement as NdFeO3. The samples treated at 1000°C for 3 hours have passed the dimensions in micrometers due to the diffusion effect between the crystals, which increases at higher temperatures. The synthesized and treated at 350 and 1000°C for 3 hours ferrites behave as magnetically "soft" or "soft" and intensity of saturation magnetization decreases with the increase in the samples of neodymium (Nd3+) materials. The proof of this decrease was demonstrated by the study of positioning of cations in the spinel network using the Rietveld refinement method, and the influence of these changes in the magnetic properties, from the comparative relationship between the magnetization values in terms of the Bohr magneton theoretical (MBTeórico) and experimental Bohr (MBExp.). The results of electrical tests of the synthesized samples showed that the materials developed have potential for miniaturization for applications in electronic devices such as inductive microwave in telecom cores |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-11-07 2014-08-15 2015-05-14T13:21:39Z 2018-07-21T00:31:02Z 2018-07-21T00:31:02Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
GOMES FILHO, Alberto Correia. Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+. 106 f. Tese (Doutorado em Química) - Universidade Federal da Paraíba, João Pessoa, 2014. https://repositorio.ufpb.br/jspui/handle/tede/7150 |
identifier_str_mv |
GOMES FILHO, Alberto Correia. Estudo da estrutura e propriedades magnéticas de ferritas de Ni2+/Zn2+ dopadas com Nd3+. 106 f. Tese (Doutorado em Química) - Universidade Federal da Paraíba, João Pessoa, 2014. |
url |
https://repositorio.ufpb.br/jspui/handle/tede/7150 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal da Paraíba BR Química Programa de Pós-Graduação em Química UFPB |
publisher.none.fl_str_mv |
Universidade Federal da Paraíba BR Química Programa de Pós-Graduação em Química UFPB |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações da UFPB instname:Universidade Federal da Paraíba (UFPB) instacron:UFPB |
instname_str |
Universidade Federal da Paraíba (UFPB) |
instacron_str |
UFPB |
institution |
UFPB |
reponame_str |
Biblioteca Digital de Teses e Dissertações da UFPB |
collection |
Biblioteca Digital de Teses e Dissertações da UFPB |
repository.name.fl_str_mv |
Biblioteca Digital de Teses e Dissertações da UFPB - Universidade Federal da Paraíba (UFPB) |
repository.mail.fl_str_mv |
diretoria@ufpb.br|| diretoria@ufpb.br |
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1801842922101932032 |