Síntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO)
Ano de defesa: | 2013 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , , |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Goiás
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Programa de Pós-Graduação: |
Programa de Pós-graduação em Química (IQ)
|
Departamento: |
Instituto de Química - IQ (RG)
|
País: |
Brasil
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.bc.ufg.br/tede/handle/tede/4145 |
Resumo: | Nanoparticles of zinc oxide doped cerium (Zn1 -xCexO) with 0.0 ≤ x ≤ 0,48% were synthesized by forced hydrolysis reaction. Structural analysis of samples was performed by X-Ray Diffraction (XRD) powder method. The chemical analysis was performed by EDS, Photo Electron Spectroscopy Excited X-ray (XPS) and Spectroscopy Infrared Fourier Transform (FTIR). Thermal analysis was obtained by Thermogravimetry (TG) analysis and magnetic analysis was performed by Magnetometry Vibrating Sample (VSM). The chemistry analysis by EDS show the samples presented amounts of the Ce with 0,0 ≤ x ≤ 0,48% . The samples presented phases corresponding the hexagonal wurtzite system compact and absence of secondary phases in the sample without heat treatment and with low amounts of dopant (2.5%). The average particle diameter was 29 nm calculated by the Scherrer equation. Chemical analysis by XPS showed peaks of greater intensity associated with the elements Zn, O and Ce being confirmed tetravalent oxidation state to the dopant (Ce4+). FTIR analysis revealed the presence of connections Zn-O type, presence of organic residues and displacement bands possibly related to the presence of dopant. Thermogravimetric analysis revealed the presence of organic residues present in the samples and a mass gain of ~ 0.2% probably associated with the formation of secondary phase of CeO2. The magnetic analyzes revealed that the samples show ferromagnetism at room temperature with coercive field (Hc) of between 60 and 90 Oe and remnant magnetization (Mr) on the order of 10-4 emu/g. The evaluation of the magnetic sample to 0,22% (Zn0,9978Ce0,0022O), heat treated, showed a reduction in the magnetic behavior of this sample with increasing heat treatment temperature. |
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Franco Júnior, Adolfohttp://lattes.cnpq.br/0187547195548392Franco Júnior, AdolfoAraújo, Olacir AlvesLima, Emília Celma de OliveiraLourenço, Marcelo Mendes2015-02-12T19:58:49Z2013-01-08LOURENÇO, Marcelo Mendes. Síntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO). 2013. 95 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2012.http://repositorio.bc.ufg.br/tede/handle/tede/4145Nanoparticles of zinc oxide doped cerium (Zn1 -xCexO) with 0.0 ≤ x ≤ 0,48% were synthesized by forced hydrolysis reaction. Structural analysis of samples was performed by X-Ray Diffraction (XRD) powder method. The chemical analysis was performed by EDS, Photo Electron Spectroscopy Excited X-ray (XPS) and Spectroscopy Infrared Fourier Transform (FTIR). Thermal analysis was obtained by Thermogravimetry (TG) analysis and magnetic analysis was performed by Magnetometry Vibrating Sample (VSM). The chemistry analysis by EDS show the samples presented amounts of the Ce with 0,0 ≤ x ≤ 0,48% . The samples presented phases corresponding the hexagonal wurtzite system compact and absence of secondary phases in the sample without heat treatment and with low amounts of dopant (2.5%). The average particle diameter was 29 nm calculated by the Scherrer equation. Chemical analysis by XPS showed peaks of greater intensity associated with the elements Zn, O and Ce being confirmed tetravalent oxidation state to the dopant (Ce4+). FTIR analysis revealed the presence of connections Zn-O type, presence of organic residues and displacement bands possibly related to the presence of dopant. Thermogravimetric analysis revealed the presence of organic residues present in the samples and a mass gain of ~ 0.2% probably associated with the formation of secondary phase of CeO2. The magnetic analyzes revealed that the samples show ferromagnetism at room temperature with coercive field (Hc) of between 60 and 90 Oe and remnant magnetization (Mr) on the order of 10-4 emu/g. The evaluation of the magnetic sample to 0,22% (Zn0,9978Ce0,0022O), heat treated, showed a reduction in the magnetic behavior of this sample with increasing heat treatment temperature.Nanopartículas de óxido de zinco dopado com cério (Zn1 -xCexO), com 0,0 ≤ x ≤ 0,48% foram sintetizadas por reação de Hidrólise Forçada. A análise estrutural das amostras foi realizada por Difração de Raios X (XRD) método do pó. A análise química foi realizada por Espectrometria de Energia Dispersiva de Raios-x (EDS), Espectroscopia de Fotoelétrons Excitados por Raios-X (XPS) e Espectroscopia no Infravermelho com Transformada de Fourier (FTIR). A análise térmica foi obtida pela análise Termogravimétrica (TG) e a análise magnética foi realizada por Magnetometria de Amostra Vibrante (VSM). A análise química por EDS revelou que as amostras apresentaram porcentagens de Ce que variaram entre 0 e 0,48%. Os difratogramas das amostras apresentaram fases correspondentes à wurtzita no sistema hexagonal compacto e ausência de fases secundárias. O diâmetro médio das partículas foi de 29 nm, calculado pela equação de Scherrer. A análise por XPS apresentou picos de maior intensidade associados aos elementos Zn, O e Ce sendo confirmado o estado de oxidação tetravalente para o dopante (Ce4+). As análises de FTIR revelaram a presença de ligações do tipo Zn-O, presença de resíduos orgânicos e deslocamento nas bandas possivelmente relacionado à presença do dopante nas amostras. A análise termogravimétrica (TG) revelou a presença de resíduos orgânicos presentes nas amostras bem como um ganho de massa de ~0,2% provavelmente associado à formação da fase secundária de CeO2. As análises magnéticas revelaram que as amostras apresentam ferromagnetismo à temperatura ambiente com campo coercivo (Hc) entre 60 e 90 Oe e magnetização remanescente (Mr) na ordem de 10-4emu/g. A avaliação magnética da amostra a 0.22% (Zn0,9978Ce0,0022O), tratada termicamente, revelou uma redução no comportamento magnético com o aumento da temperatura do tratamento térmico.Submitted by Erika Demachki (erikademachki@gmail.com) on 2015-02-12T19:58:19Z No. of bitstreams: 2 Dissertação - Marcelo Mendes Lourenço - 2012.pdf: 2641976 bytes, checksum: 881f9a3b035c8f36d76de655b3ee307b (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)Approved for entry into archive by Erika Demachki (erikademachki@gmail.com) on 2015-02-12T19:58:49Z (GMT) No. of bitstreams: 2 Dissertação - Marcelo Mendes Lourenço - 2012.pdf: 2641976 bytes, checksum: 881f9a3b035c8f36d76de655b3ee307b (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)Made available in DSpace on 2015-02-12T19:58:49Z (GMT). No. of bitstreams: 2 Dissertação - Marcelo Mendes Lourenço - 2012.pdf: 2641976 bytes, checksum: 881f9a3b035c8f36d76de655b3ee307b (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2013-01-08application/pdfhttp://repositorio.bc.ufg.br/tede/retrieve/16813/Disserta%c3%a7%c3%a3o%20-%20Marcelo%20Mendes%20Louren%c3%a7o%20-%202012.pdf.jpgporUniversidade Federal de GoiásPrograma de Pós-graduação em Química (IQ)UFGBrasilInstituto de Química - IQ (RG)http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessÓxido de zincoCérioPropriedades magnéticasZinc oxideCeriumMagnetic propertiesCIENCIAS EXATAS E DA TERRA::QUIMICASíntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO)Synthesis, characterization and stability study of magnetic properties of zinc oxide doped with cerium (Zn1 -xCexO)info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis66369392132541515860060060078260667437411972781571700325303117195reponame:Biblioteca Digital de Teses e Dissertações da UFGinstname:Universidade Federal de Goiás (UFG)instacron:UFGLICENSElicense.txtlicense.txttext/plain; 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dc.title.eng.fl_str_mv |
Síntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO) |
dc.title.alternative.eng.fl_str_mv |
Synthesis, characterization and stability study of magnetic properties of zinc oxide doped with cerium (Zn1 -xCexO) |
title |
Síntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO) |
spellingShingle |
Síntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO) Lourenço, Marcelo Mendes Óxido de zinco Cério Propriedades magnéticas Zinc oxide Cerium Magnetic properties CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Síntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO) |
title_full |
Síntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO) |
title_fullStr |
Síntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO) |
title_full_unstemmed |
Síntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO) |
title_sort |
Síntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO) |
author |
Lourenço, Marcelo Mendes |
author_facet |
Lourenço, Marcelo Mendes |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Franco Júnior, Adolfo |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0187547195548392 |
dc.contributor.referee1.fl_str_mv |
Franco Júnior, Adolfo |
dc.contributor.referee2.fl_str_mv |
Araújo, Olacir Alves |
dc.contributor.referee3.fl_str_mv |
Lima, Emília Celma de Oliveira |
dc.contributor.author.fl_str_mv |
Lourenço, Marcelo Mendes |
contributor_str_mv |
Franco Júnior, Adolfo Franco Júnior, Adolfo Araújo, Olacir Alves Lima, Emília Celma de Oliveira |
dc.subject.por.fl_str_mv |
Óxido de zinco Cério Propriedades magnéticas |
topic |
Óxido de zinco Cério Propriedades magnéticas Zinc oxide Cerium Magnetic properties CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.eng.fl_str_mv |
Zinc oxide Cerium Magnetic properties |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
Nanoparticles of zinc oxide doped cerium (Zn1 -xCexO) with 0.0 ≤ x ≤ 0,48% were synthesized by forced hydrolysis reaction. Structural analysis of samples was performed by X-Ray Diffraction (XRD) powder method. The chemical analysis was performed by EDS, Photo Electron Spectroscopy Excited X-ray (XPS) and Spectroscopy Infrared Fourier Transform (FTIR). Thermal analysis was obtained by Thermogravimetry (TG) analysis and magnetic analysis was performed by Magnetometry Vibrating Sample (VSM). The chemistry analysis by EDS show the samples presented amounts of the Ce with 0,0 ≤ x ≤ 0,48% . The samples presented phases corresponding the hexagonal wurtzite system compact and absence of secondary phases in the sample without heat treatment and with low amounts of dopant (2.5%). The average particle diameter was 29 nm calculated by the Scherrer equation. Chemical analysis by XPS showed peaks of greater intensity associated with the elements Zn, O and Ce being confirmed tetravalent oxidation state to the dopant (Ce4+). FTIR analysis revealed the presence of connections Zn-O type, presence of organic residues and displacement bands possibly related to the presence of dopant. Thermogravimetric analysis revealed the presence of organic residues present in the samples and a mass gain of ~ 0.2% probably associated with the formation of secondary phase of CeO2. The magnetic analyzes revealed that the samples show ferromagnetism at room temperature with coercive field (Hc) of between 60 and 90 Oe and remnant magnetization (Mr) on the order of 10-4 emu/g. The evaluation of the magnetic sample to 0,22% (Zn0,9978Ce0,0022O), heat treated, showed a reduction in the magnetic behavior of this sample with increasing heat treatment temperature. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013-01-08 |
dc.date.accessioned.fl_str_mv |
2015-02-12T19:58:49Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
LOURENÇO, Marcelo Mendes. Síntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO). 2013. 95 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2012. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/4145 |
identifier_str_mv |
LOURENÇO, Marcelo Mendes. Síntese, caracterização e estudo das propriedades magnéticas do óxido de zinco dopado com cério (Zn1 -xCexO). 2013. 95 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2012. |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/4145 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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663693921325415158 |
dc.relation.confidence.fl_str_mv |
600 600 600 |
dc.relation.department.fl_str_mv |
7826066743741197278 |
dc.relation.cnpq.fl_str_mv |
1571700325303117195 |
dc.rights.driver.fl_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.publisher.program.fl_str_mv |
Programa de Pós-graduação em Química (IQ) |
dc.publisher.initials.fl_str_mv |
UFG |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Instituto de Química - IQ (RG) |
publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações da UFG instname:Universidade Federal de Goiás (UFG) instacron:UFG |
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institution |
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Biblioteca Digital de Teses e Dissertações da UFG |
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Biblioteca Digital de Teses e Dissertações da UFG |
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Biblioteca Digital de Teses e Dissertações da UFG - Universidade Federal de Goiás (UFG) |
repository.mail.fl_str_mv |
tesesdissertacoes.bc@ufg.br ||tesesdissertacoes.bc@ufg.br |
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