Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/4928 |
Resumo: | Multiferroic ceramic solid solutions between the ferroelectric relaxor Pb(Fe2/3W1/3)O3 (PFW) and normal ferroelectric PbTiO3 (PT) [PFW-PT] has been synthesized by a modified B-site precursor method and characterized by X-ray diffraction, differential thermal analysis, dielectric, electric, magnetic and anelastic measurements. A two-stage solid-state reaction turned out to be appropriate for the formation of the majoritary PFW phase as well as PFW-PT solid solutions, with low percentage of spurious phases, high densities, dielectric constant and electric resistivities. Intrinsic relationship between structure, composition, magnetic ordering and dielectric proprieties was discussed. Dielectric properties have been tailored by adding PbTiO3, bringing the ferroelectric transition toward the room temperature, transforming the phase transition from diffuse, typical for ferroelectric relaxors, to a sharp one, characteristic of normal ferroelectrics. Two types of superexchange magnetic interactions and a succession of magnetic transitions with Neel temperatures dependent on the composition were found in the solid solutions. The magnetic ordering at TN1 is expected to vanish with PT addition, for higher amounts of PT to 30 percent. For 12-13%PT, the samples are multiferroic (presenting ferroelectric and antiferromagnetic ordering) below 237K. Anomalies in the temperature dependence of the elastic constants have been observed at TN and TC for all samples, indicating that the magnetoelectric coupling between the ferroelectric and antiferromagnetic orders occurs via strain . The value of the magnetoelectric coefficients η were estimated for all samples, from the measured values of their magnetic susceptibility, dielectric constant, magnetoelastic and electroelastic coefficients. Additionally, an interplay between ferroelectric and ferromagnetic properties of the samples, as well as the influence of the proximity of the temperatures of the establishment of both orderings with intrinsic magnetoelectric coupling coefficient was established. |
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Fraygola, Bárbara MarastonEiras, José Antôniohttp://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4783594Z6http://lattes.cnpq.br/63370819213310564017e666-f367-445f-81a6-f88ce33bd4cd2016-06-02T20:15:22Z2010-12-072016-06-02T20:15:22Z2010-11-25FRAYGOLA, Bárbara Maraston. Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco. 2010. 233 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2010.https://repositorio.ufscar.br/handle/ufscar/4928Multiferroic ceramic solid solutions between the ferroelectric relaxor Pb(Fe2/3W1/3)O3 (PFW) and normal ferroelectric PbTiO3 (PT) [PFW-PT] has been synthesized by a modified B-site precursor method and characterized by X-ray diffraction, differential thermal analysis, dielectric, electric, magnetic and anelastic measurements. A two-stage solid-state reaction turned out to be appropriate for the formation of the majoritary PFW phase as well as PFW-PT solid solutions, with low percentage of spurious phases, high densities, dielectric constant and electric resistivities. Intrinsic relationship between structure, composition, magnetic ordering and dielectric proprieties was discussed. Dielectric properties have been tailored by adding PbTiO3, bringing the ferroelectric transition toward the room temperature, transforming the phase transition from diffuse, typical for ferroelectric relaxors, to a sharp one, characteristic of normal ferroelectrics. Two types of superexchange magnetic interactions and a succession of magnetic transitions with Neel temperatures dependent on the composition were found in the solid solutions. The magnetic ordering at TN1 is expected to vanish with PT addition, for higher amounts of PT to 30 percent. For 12-13%PT, the samples are multiferroic (presenting ferroelectric and antiferromagnetic ordering) below 237K. Anomalies in the temperature dependence of the elastic constants have been observed at TN and TC for all samples, indicating that the magnetoelectric coupling between the ferroelectric and antiferromagnetic orders occurs via strain . The value of the magnetoelectric coefficients η were estimated for all samples, from the measured values of their magnetic susceptibility, dielectric constant, magnetoelastic and electroelastic coefficients. Additionally, an interplay between ferroelectric and ferromagnetic properties of the samples, as well as the influence of the proximity of the temperatures of the establishment of both orderings with intrinsic magnetoelectric coupling coefficient was established.Ceramicas multiferroicas da solucao solida entre o relaxor Pb (Fe2/3W1/3) O3 (PFW) e o ferroeletrico normal PbTiO3 (PT) [PFW-PT] foram sintetizadas pelo metodo do sitio B modificado e caracterizadas por difracao de raios X , analise termica diferencial, medidas dieletricas, eletricas, ferroeletricas, magneticas e anelasticas. Este metodo resultou adequado para a formacao da fase pura das ceramicas de PFW assim como da solucao solida com PT, com baixissima porcentagem de fases espurias, altas densidades, altas constantes dieletricas e altas resistividades. A adicao de PT aumenta a temperatura de transicao ferroeletrica do PFW puro , levando a amostra de uma transicao com caracteristicas relaxoras (Tc~180K para as amostras de PFW) para uma transicao normal (Tc~320K para as amostras de PFW-30PT). Dois tipos de interacoes magneticas (antiferromagnetica e ferromagnetica fraca) com temperaturas dependentes da composicao foram encontrados na solucao solida. A temperatura de ordenamento antiferromagnetico em TN1 (~350K para o PFW puro) desaparece com a adicao PT, enquanto que a temperatura de transicao a baixas temperaturas (~10K para o PFW puro) aumenta com a adicao de PT ao sistema. Para 12-13% PT, as amostras sao multiferroicas (com ordenamentos ferroeletrico e antiferromagnetico) abaixo de 237K. As relacoes entre a estrutura, composicao, ordenamento magnetico e propriedades dieletricas foram discutidas. Anomalias na dependencia com a temperatura das constantes elasticas foram observadas em TN e TC para todas as amostras, indicando que o acoplamento magnetoeletrico ocorre vai strain . O valor do coeficiente magnetoeletrico intrinseco η foi estimado para todas as amostras, a partir dos valores medidos de susceptibilidade magnetica, constantes dieletricas, coeficientes magnetoelasticos e eletroelasticos. Adicionalmente, uma interrelacao entre as propriedades ferroeletricas e ferromagneticas das amostras, assim como da influencia da proximidade das temperaturas de estabelecimento de ambos os ordenamentos com o coeficiente de acoplamento magnetoeletrico intrinseco foi estabelecida.Universidade Federal de Minas Geraisapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Física - PPGFUFSCarBRFísica da matéria condensadaCerâmicas multiferróicasMagnetoelétricosFerroelétricosUltra-somCIENCIAS EXATAS E DA TERRA::FISICA::FISICA DA MATERIA CONDENSADAMultiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínsecoinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis-1-1084f0690-123f-438a-ab51-d1b70448166dinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL3342.pdfapplication/pdf5504646https://repositorio.ufscar.br/bitstream/ufscar/4928/1/3342.pdfc4f8ff5e8dec83b3c337cd77e6a5f8fdMD51THUMBNAIL3342.pdf.jpg3342.pdf.jpgIM Thumbnailimage/jpeg8092https://repositorio.ufscar.br/bitstream/ufscar/4928/2/3342.pdf.jpgfccf24a298e41f2523e3e053d158bb45MD52ufscar/49282023-09-18 18:31:04.917oai:repositorio.ufscar.br:ufscar/4928Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:04Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco |
title |
Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco |
spellingShingle |
Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco Fraygola, Bárbara Maraston Física da matéria condensada Cerâmicas multiferróicas Magnetoelétricos Ferroelétricos Ultra-som CIENCIAS EXATAS E DA TERRA::FISICA::FISICA DA MATERIA CONDENSADA |
title_short |
Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco |
title_full |
Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco |
title_fullStr |
Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco |
title_full_unstemmed |
Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco |
title_sort |
Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco |
author |
Fraygola, Bárbara Maraston |
author_facet |
Fraygola, Bárbara Maraston |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/6337081921331056 |
dc.contributor.author.fl_str_mv |
Fraygola, Bárbara Maraston |
dc.contributor.advisor1.fl_str_mv |
Eiras, José Antônio |
dc.contributor.advisor1Lattes.fl_str_mv |
http://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4783594Z6 |
dc.contributor.authorID.fl_str_mv |
4017e666-f367-445f-81a6-f88ce33bd4cd |
contributor_str_mv |
Eiras, José Antônio |
dc.subject.por.fl_str_mv |
Física da matéria condensada Cerâmicas multiferróicas Magnetoelétricos Ferroelétricos Ultra-som |
topic |
Física da matéria condensada Cerâmicas multiferróicas Magnetoelétricos Ferroelétricos Ultra-som CIENCIAS EXATAS E DA TERRA::FISICA::FISICA DA MATERIA CONDENSADA |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::FISICA::FISICA DA MATERIA CONDENSADA |
description |
Multiferroic ceramic solid solutions between the ferroelectric relaxor Pb(Fe2/3W1/3)O3 (PFW) and normal ferroelectric PbTiO3 (PT) [PFW-PT] has been synthesized by a modified B-site precursor method and characterized by X-ray diffraction, differential thermal analysis, dielectric, electric, magnetic and anelastic measurements. A two-stage solid-state reaction turned out to be appropriate for the formation of the majoritary PFW phase as well as PFW-PT solid solutions, with low percentage of spurious phases, high densities, dielectric constant and electric resistivities. Intrinsic relationship between structure, composition, magnetic ordering and dielectric proprieties was discussed. Dielectric properties have been tailored by adding PbTiO3, bringing the ferroelectric transition toward the room temperature, transforming the phase transition from diffuse, typical for ferroelectric relaxors, to a sharp one, characteristic of normal ferroelectrics. Two types of superexchange magnetic interactions and a succession of magnetic transitions with Neel temperatures dependent on the composition were found in the solid solutions. The magnetic ordering at TN1 is expected to vanish with PT addition, for higher amounts of PT to 30 percent. For 12-13%PT, the samples are multiferroic (presenting ferroelectric and antiferromagnetic ordering) below 237K. Anomalies in the temperature dependence of the elastic constants have been observed at TN and TC for all samples, indicating that the magnetoelectric coupling between the ferroelectric and antiferromagnetic orders occurs via strain . The value of the magnetoelectric coefficients η were estimated for all samples, from the measured values of their magnetic susceptibility, dielectric constant, magnetoelastic and electroelastic coefficients. Additionally, an interplay between ferroelectric and ferromagnetic properties of the samples, as well as the influence of the proximity of the temperatures of the establishment of both orderings with intrinsic magnetoelectric coupling coefficient was established. |
publishDate |
2010 |
dc.date.available.fl_str_mv |
2010-12-07 2016-06-02T20:15:22Z |
dc.date.issued.fl_str_mv |
2010-11-25 |
dc.date.accessioned.fl_str_mv |
2016-06-02T20:15:22Z |
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 |
FRAYGOLA, Bárbara Maraston. Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco. 2010. 233 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2010. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/4928 |
identifier_str_mv |
FRAYGOLA, Bárbara Maraston. Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco. 2010. 233 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2010. |
url |
https://repositorio.ufscar.br/handle/ufscar/4928 |
dc.language.iso.fl_str_mv |
por |
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por |
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-1 -1 |
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084f0690-123f-438a-ab51-d1b70448166d |
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info:eu-repo/semantics/openAccess |
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openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de São Carlos |
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Programa de Pós-Graduação em Física - PPGF |
dc.publisher.initials.fl_str_mv |
UFSCar |
dc.publisher.country.fl_str_mv |
BR |
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Universidade Federal de São Carlos |
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