Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2
Autor(a) principal: | |
---|---|
Data de Publicação: | 2019 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/12263 |
Resumo: | We investigated the structural, optical and magnetic properties of two nanoparticles oxide systems: In2O3, prepared by the high energy mechanical milling process, and (Sn1-xCex)O2 produced by the Pechini method, using different synthesis temperatures and the cerium concentration. The structural and morphological properties of nanoparticles were characterized by X-ray diffraction (XRD) techniques, using the Rietveld refinement, field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high resolution (HRTEM). The chemical composition and valence of the ions were investigated using X-ray photoelectron spectroscopy (XPS). Optical properties were studied using UV-Vis and photoluminescence (PL) techniques. Finally, magnetization measurements were performed using the SQUID magnetometry technique. The XRD measurements and the HRTEM images show that the formation of the cubic phase in In2O3 and the tetragonal SnO2 in the NPs of (Sn1-xCex)O2 as the main phases. In addition, in the process of obtaining the samples, we identified that the 96-h milling in the indium oxide led to the formation of the hexagonal phase, H- In2O3. When synthesizing samples of (Sn1-xCex)O2 at a temperature of 750 °C, an orthorhombic phase, O-SnO2, previously only encountered under high pressure and temperature, was formed. The stabilization of these phases at room temperature was associated with the effect of strain and/or defects that led to the establishment of ferromagnetism in our samples, exhibiting anomalous behaviour depending on the coercivity with temperature. We associate this behaviour to the effect of particle size distribution on the magnetic properties of indium oxide and the surface effects on the NPs of (Sn1-xCex)O2. The ferromagnetic behaviour observed in the NPs was related to the singly ionized oxygen vacancies on the surface of the NPs and with the effect of the strain. |
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Costa, Maria Helena Carvalho daOliveira, Adilson Jesus Aparecido dehttp://lattes.cnpq.br/4640148190073166Souza, Ernesto Chaves Pereira dehttp://lattes.cnpq.br/1505400360366643http://lattes.cnpq.br/7479325887608831e1ada79e-3155-4ce2-a2d2-f9308430391b2020-02-18T14:06:32Z2020-02-18T14:06:32Z2019-05-02COSTA, Maria Helena Carvalho da. Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2. 2019. Tese (Doutorado em Física) – Universidade Federal de São Carlos, São Carlos, 2019. Disponível em: https://repositorio.ufscar.br/handle/ufscar/12263.https://repositorio.ufscar.br/handle/ufscar/12263We investigated the structural, optical and magnetic properties of two nanoparticles oxide systems: In2O3, prepared by the high energy mechanical milling process, and (Sn1-xCex)O2 produced by the Pechini method, using different synthesis temperatures and the cerium concentration. The structural and morphological properties of nanoparticles were characterized by X-ray diffraction (XRD) techniques, using the Rietveld refinement, field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high resolution (HRTEM). The chemical composition and valence of the ions were investigated using X-ray photoelectron spectroscopy (XPS). Optical properties were studied using UV-Vis and photoluminescence (PL) techniques. Finally, magnetization measurements were performed using the SQUID magnetometry technique. The XRD measurements and the HRTEM images show that the formation of the cubic phase in In2O3 and the tetragonal SnO2 in the NPs of (Sn1-xCex)O2 as the main phases. In addition, in the process of obtaining the samples, we identified that the 96-h milling in the indium oxide led to the formation of the hexagonal phase, H- In2O3. When synthesizing samples of (Sn1-xCex)O2 at a temperature of 750 °C, an orthorhombic phase, O-SnO2, previously only encountered under high pressure and temperature, was formed. The stabilization of these phases at room temperature was associated with the effect of strain and/or defects that led to the establishment of ferromagnetism in our samples, exhibiting anomalous behaviour depending on the coercivity with temperature. We associate this behaviour to the effect of particle size distribution on the magnetic properties of indium oxide and the surface effects on the NPs of (Sn1-xCex)O2. The ferromagnetic behaviour observed in the NPs was related to the singly ionized oxygen vacancies on the surface of the NPs and with the effect of the strain.Investigamos as propriedades estruturais, ópticas e magnéticas de nanopartículas (NPs) de In2O3 obtidas pelo processo de moagem mecânica de alta energia e de (Sn1-xCex)O2 obtidas variando a temperatura de síntese e a concentração de cério, pelo método Pechini. As nanopartículas foram caracterizadas quanto às suas propriedades estruturais e morfológica, por técnicas de difração de raios X (DRX), aliada ao Método de Rietveld, microscopia eletrônica de varredura de emissão de campo (MEV), microscopia eletrônica de transmissão (MET) e de alta resolução (HRTEM). Foram investigadas a composição química e valência dos íons, utilizando a técnica de espectroscopia de fotoelétrons excitados por raios X (XPS), as propriedades ópticas através das técnicas de UV-Vis e fotoluminescência (PL) e as propriedades magnéticas utilizando a técnica de magnetometria SQUID. As medidas de DRX e as imagens de HRTEM confirmaram a formação da fase cúbica no In2O3 e a tetragonal do SnO2 nas NPs de (Sn1-xCex)O2, como fases principais. Além disso, no processo de obtenção das amostras, identificamos que, a moagem por 96 h no óxido de índio levou a formação da fase hexagonal, H-In2O3. Ao sintetizar amostras de (Sn1-xCex)O2 na temperatura de 750 °C houve a formação de uma fase ortorrômbica, O-SnO2, previamente apenas encontrada em regime de altas pressões e temperatura. A estabilização dessas fases, à temperatura ambiente, foi associada ao efeito de strain e/ou defeitos que levaram ao estabelecimento de ferromagnetismo em nossas amostras, exibindo um comportamento anômalo na dependência da coercividade com a temperatura. Associamos esse comportamento ao efeito da distribuição de tamanho de partículas nas propriedades magnéticas do óxido de índio e aos efeitos de superfície nas NPs de (Sn1-xCex)O2. O comportamento ferromagnético observado nas NPs foram relacionados as vacâncias de oxigênio monoionizada na superfície das NPs e com o efeito de strain.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)CAPES: código de financiamento - 001CNPqFAPESPporUniversidade Federal de São CarlosCâmpus São CarlosPrograma de Pós-Graduação em Física - PPGFUFSCarAttribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessNanopartículasMagnetismo d0Campo coercivoMoagem mecânicaMétodo PechiniNanoparticlesd0 magnetismCoercive fieldMechanical millingPechini methodCIENCIAS EXATAS E DA TERRA::FISICAMagnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2d0 magnetism in In2O3 and (Sn1-xCex)O2 oxidesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis6003660a2fe-e03b-4e27-949c-12e9ea784c7creponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALCarvalho_Tese2019.pdfCarvalho_Tese2019.pdfapplication/pdf12806062https://repositorio.ufscar.br/bitstream/ufscar/12263/1/Carvalho_Tese2019.pdf1b634dccab60bf8740e0396c9ba79533MD51Carta de encaminhamento - Adilson.pdfCarta de encaminhamento - Adilson.pdfapplication/pdf193566https://repositorio.ufscar.br/bitstream/ufscar/12263/2/Carta%20de%20encaminhamento%20-%20Adilson.pdf9aadecfc5502f4b10472653ae03fac79MD52CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8811https://repositorio.ufscar.br/bitstream/ufscar/12263/3/license_rdfe39d27027a6cc9cb039ad269a5db8e34MD53TEXTCarvalho_Tese2019.pdf.txtCarvalho_Tese2019.pdf.txtExtracted texttext/plain262463https://repositorio.ufscar.br/bitstream/ufscar/12263/4/Carvalho_Tese2019.pdf.txtf9005223463b9c42f52dbc0fe2bbb350MD54Carta de encaminhamento - Adilson.pdf.txtCarta de encaminhamento - Adilson.pdf.txtExtracted texttext/plain1317https://repositorio.ufscar.br/bitstream/ufscar/12263/6/Carta%20de%20encaminhamento%20-%20Adilson.pdf.txt6e235bc0ab9009bf40b349e4a9fa6c9dMD56THUMBNAILCarvalho_Tese2019.pdf.jpgCarvalho_Tese2019.pdf.jpgIM Thumbnailimage/jpeg5671https://repositorio.ufscar.br/bitstream/ufscar/12263/5/Carvalho_Tese2019.pdf.jpg6b11eba1968b7cc0d64dd0336ebac46aMD55Carta de encaminhamento - Adilson.pdf.jpgCarta de encaminhamento - Adilson.pdf.jpgIM Thumbnailimage/jpeg13191https://repositorio.ufscar.br/bitstream/ufscar/12263/7/Carta%20de%20encaminhamento%20-%20Adilson.pdf.jpg36746f9f0c36481c0a92c075e44fe780MD57ufscar/122632023-09-18 18:31:50.503oai:repositorio.ufscar.br:ufscar/12263Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:50Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2 |
dc.title.alternative.eng.fl_str_mv |
d0 magnetism in In2O3 and (Sn1-xCex)O2 oxides |
title |
Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2 |
spellingShingle |
Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2 Costa, Maria Helena Carvalho da Nanopartículas Magnetismo d0 Campo coercivo Moagem mecânica Método Pechini Nanoparticles d0 magnetism Coercive field Mechanical milling Pechini method CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2 |
title_full |
Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2 |
title_fullStr |
Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2 |
title_full_unstemmed |
Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2 |
title_sort |
Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2 |
author |
Costa, Maria Helena Carvalho da |
author_facet |
Costa, Maria Helena Carvalho da |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/7479325887608831 |
dc.contributor.author.fl_str_mv |
Costa, Maria Helena Carvalho da |
dc.contributor.advisor1.fl_str_mv |
Oliveira, Adilson Jesus Aparecido de |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/4640148190073166 |
dc.contributor.advisor-co1.fl_str_mv |
Souza, Ernesto Chaves Pereira de |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/1505400360366643 |
dc.contributor.authorID.fl_str_mv |
e1ada79e-3155-4ce2-a2d2-f9308430391b |
contributor_str_mv |
Oliveira, Adilson Jesus Aparecido de Souza, Ernesto Chaves Pereira de |
dc.subject.por.fl_str_mv |
Nanopartículas Magnetismo d0 Campo coercivo Moagem mecânica Método Pechini |
topic |
Nanopartículas Magnetismo d0 Campo coercivo Moagem mecânica Método Pechini Nanoparticles d0 magnetism Coercive field Mechanical milling Pechini method CIENCIAS EXATAS E DA TERRA::FISICA |
dc.subject.eng.fl_str_mv |
Nanoparticles d0 magnetism Coercive field Mechanical milling Pechini method |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::FISICA |
description |
We investigated the structural, optical and magnetic properties of two nanoparticles oxide systems: In2O3, prepared by the high energy mechanical milling process, and (Sn1-xCex)O2 produced by the Pechini method, using different synthesis temperatures and the cerium concentration. The structural and morphological properties of nanoparticles were characterized by X-ray diffraction (XRD) techniques, using the Rietveld refinement, field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high resolution (HRTEM). The chemical composition and valence of the ions were investigated using X-ray photoelectron spectroscopy (XPS). Optical properties were studied using UV-Vis and photoluminescence (PL) techniques. Finally, magnetization measurements were performed using the SQUID magnetometry technique. The XRD measurements and the HRTEM images show that the formation of the cubic phase in In2O3 and the tetragonal SnO2 in the NPs of (Sn1-xCex)O2 as the main phases. In addition, in the process of obtaining the samples, we identified that the 96-h milling in the indium oxide led to the formation of the hexagonal phase, H- In2O3. When synthesizing samples of (Sn1-xCex)O2 at a temperature of 750 °C, an orthorhombic phase, O-SnO2, previously only encountered under high pressure and temperature, was formed. The stabilization of these phases at room temperature was associated with the effect of strain and/or defects that led to the establishment of ferromagnetism in our samples, exhibiting anomalous behaviour depending on the coercivity with temperature. We associate this behaviour to the effect of particle size distribution on the magnetic properties of indium oxide and the surface effects on the NPs of (Sn1-xCex)O2. The ferromagnetic behaviour observed in the NPs was related to the singly ionized oxygen vacancies on the surface of the NPs and with the effect of the strain. |
publishDate |
2019 |
dc.date.issued.fl_str_mv |
2019-05-02 |
dc.date.accessioned.fl_str_mv |
2020-02-18T14:06:32Z |
dc.date.available.fl_str_mv |
2020-02-18T14:06:32Z |
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.citation.fl_str_mv |
COSTA, Maria Helena Carvalho da. Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2. 2019. Tese (Doutorado em Física) – Universidade Federal de São Carlos, São Carlos, 2019. Disponível em: https://repositorio.ufscar.br/handle/ufscar/12263. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/12263 |
identifier_str_mv |
COSTA, Maria Helena Carvalho da. Magnetismo d0 em óxidos de In2O3 e (Sn1-xCex)O2. 2019. Tese (Doutorado em Física) – Universidade Federal de São Carlos, São Carlos, 2019. Disponível em: https://repositorio.ufscar.br/handle/ufscar/12263. |
url |
https://repositorio.ufscar.br/handle/ufscar/12263 |
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por |
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por |
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600 |
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3660a2fe-e03b-4e27-949c-12e9ea784c7c |
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Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ info:eu-repo/semantics/openAccess |
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Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ |
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openAccess |
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Universidade Federal de São Carlos Câmpus São Carlos |
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Programa de Pós-Graduação em Física - PPGF |
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UFSCar |
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Universidade Federal de São Carlos Câmpus São Carlos |
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Universidade Federal de São Carlos (UFSCAR) |
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UFSCAR |
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UFSCAR |
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Repositório Institucional da UFSCAR |
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Repositório Institucional da UFSCAR |
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