Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de síntese
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/190896 http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/12-07-2019/000917985.pdf |
Resumo: | With high critical temperature superconducting discovered in the 80s, the studies of superconducting materials have intensified in an attempt to obtain materials with Tc increasing, above the temperature of liquid nitrogen (77 K). However, some superconducting materials of high Tc are difficult to be obtained, as in the case of superconducting ceramic compositesof Bi- Sr-Ca-Cu-O (BSCCO) that presents predominant four phases: Bi2Sr2CuO6 (Bi-2201), Bi2Sr2Ca1Cu2O8 (Bi 2212), Bi2Sr2Ca2Cu3O10 (Bi-2223) and Bi2Sr2Ca3Cu4O12 (Bi-2234), with its Tc respectively in the range of 7-22 K, 75-94 K, 100-125 K and 90-100 K. Unfortunately the high-Tc phase (Bi-2223) in this high-temperature superconductor is thermodynamically unstable. One of the used solutions to improve this phase stability is the chemical element substitution. Thus, in this work we study the stabilization of the Bi-2223 phase using the method of chemical element substitution in which the Bi was replaced partially by Pb. For this, the stoichiometry used was Bi2-xPbxSr2Ca2Cu3Oywith x = 0.00; 0.30; 0.35; 0.40; 0.45; 0.50 mol/g. The solutions were prepared by the polymeric precursor method based on the Pechini method. The polymeric resin obtained was thermally treated at 200°C for 10 h.Then the resin was macerated and the powder obtained in this procedure was again thermally treated between 400°C and 810°C. With the resulting powder, pastilles were prepared and soon after were subjected to a new thermal treatment to 845°C for 60 h. Structural characterizations of the samples were investigated by the technique of X-ray diffraction - (XRD); electrical characterization by four-point probe dc conductivity method and chemical characterization by Energy-dispersive X-ray spectroscopy (EDX).The results showed that in the samples prepared with concentrations of 0.00, 0.30 and 0.35 mol/g Pb prevailed the phase Bi -2212, however for the concentration of 0.40 mol/g of Pb the Bi-2223 phase was the... |
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Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de sínteseBSCCO systemReplacementPechini methodHigh critical temperatureSupercondutores ceramicosAltas temperaturasEstequiometriaStoichiometryWith high critical temperature superconducting discovered in the 80s, the studies of superconducting materials have intensified in an attempt to obtain materials with Tc increasing, above the temperature of liquid nitrogen (77 K). However, some superconducting materials of high Tc are difficult to be obtained, as in the case of superconducting ceramic compositesof Bi- Sr-Ca-Cu-O (BSCCO) that presents predominant four phases: Bi2Sr2CuO6 (Bi-2201), Bi2Sr2Ca1Cu2O8 (Bi 2212), Bi2Sr2Ca2Cu3O10 (Bi-2223) and Bi2Sr2Ca3Cu4O12 (Bi-2234), with its Tc respectively in the range of 7-22 K, 75-94 K, 100-125 K and 90-100 K. Unfortunately the high-Tc phase (Bi-2223) in this high-temperature superconductor is thermodynamically unstable. One of the used solutions to improve this phase stability is the chemical element substitution. Thus, in this work we study the stabilization of the Bi-2223 phase using the method of chemical element substitution in which the Bi was replaced partially by Pb. For this, the stoichiometry used was Bi2-xPbxSr2Ca2Cu3Oywith x = 0.00; 0.30; 0.35; 0.40; 0.45; 0.50 mol/g. The solutions were prepared by the polymeric precursor method based on the Pechini method. The polymeric resin obtained was thermally treated at 200°C for 10 h.Then the resin was macerated and the powder obtained in this procedure was again thermally treated between 400°C and 810°C. With the resulting powder, pastilles were prepared and soon after were subjected to a new thermal treatment to 845°C for 60 h. Structural characterizations of the samples were investigated by the technique of X-ray diffraction - (XRD); electrical characterization by four-point probe dc conductivity method and chemical characterization by Energy-dispersive X-ray spectroscopy (EDX).The results showed that in the samples prepared with concentrations of 0.00, 0.30 and 0.35 mol/g Pb prevailed the phase Bi -2212, however for the concentration of 0.40 mol/g of Pb the Bi-2223 phase was the...Com os supercondutores de alta temperatura crítica (Tc) descobertos na década de 80, os estudos dos materiais supercondutores se intensificaram na tentativa de se obter materiais com Tc's cada vez maiores, ou seja, acima da temperatura do nitrogênio líquido (77 K). No entanto, alguns materiais supercondutores de alta Tc são difíceis de serem obtidos, como no caso do supercondutor cerâmico composto de Bi-Sr-Ca-Cu-O (BSCCO) que apresenta quatro fases predominantes: Bi2Sr2CuO6 (Bi-2201), Bi2Sr2Ca1Cu2O8 (Bi-2212), Bi2Sr2Ca2Cu3O10 (Bi-2223) e Bi2Sr2Ca3Cu4O12 (Bi-2234), com suas Tc's, respectivamente, na faixa de 7-22 K, 75-94 K, 100-125 K e 90-100 K. Infelizmente este supercondutor apresenta instabilidade na fase de maior Tc (Bi-2223). Uma das soluções utilizadas para melhorar a estabilidade desta fase consiste na substituição de elementos químicos. Desta forma, neste trabalho estudamos a estabilização da fase Bi-2223, utilizando o método de substituição onde o Bi foi substituído parcialmente pelo Pb. Para isso, a estequiometria utilizada foiBi2-xPbxSr2Ca2Cu3Oycom x = 0,00, 0,30, 0,35, 0,40, 0,45, 0,50 mol/g. As soluções precursoras foram preparadas baseadas no método Pechini de síntese, na qual se obteve uma resina polimérica que foi tratada termicamente a 200°C por 10 h. Em seguida, a resina foi macerada e o pó obtido nesse procedimento foi novamente tratado termicamente entre 400 e 810°C. Com o pó resultante, foram preparadas pastilhas e, logo após, submetidas a um novo tratamento térmico a 845°C/60 h. Nas pastilhas foram feitas as caracterizações estruturais por meio da técnica de Difratometria de Raios - X (DRX); caracterização elétrica pelo método de quatro pontas dc e química pela técnica de Espectroscopia por Energia Dispersiva de Raios - X (EDX).Os resultados mostraram que nas amostras preparadas com as concentrações de 0,00; 0,30 e 0,35 mols/g de Pb predominou a fase Bi-2212, no entanto para 0,40...Universidade Estadual Paulista (Unesp)Paula, Fernando Rogério de [UNESP]Universidade Estadual Paulista (Unesp)Aguiar, Felipe Magalhães de [UNESP]2019-10-29T15:24:01Z2019-10-29T15:24:01Z2015-01-30info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis83 f. : il.application/pdfAGUIAR, Felipe Magalhães de. Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de síntese. 2015. 83 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Engenharia, 2015.http://hdl.handle.net/11449/190896000917985http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/12-07-2019/000917985.pdf33004099083P9Alephreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporinfo:eu-repo/semantics/openAccess2023-12-30T06:24:04Zoai:repositorio.unesp.br:11449/190896Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:44:10.125833Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de síntese |
title |
Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de síntese |
spellingShingle |
Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de síntese Aguiar, Felipe Magalhães de [UNESP] BSCCO system Replacement Pechini method High critical temperature Supercondutores ceramicos Altas temperaturas Estequiometria Stoichiometry |
title_short |
Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de síntese |
title_full |
Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de síntese |
title_fullStr |
Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de síntese |
title_full_unstemmed |
Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de síntese |
title_sort |
Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de síntese |
author |
Aguiar, Felipe Magalhães de [UNESP] |
author_facet |
Aguiar, Felipe Magalhães de [UNESP] |
author_role |
author |
dc.contributor.none.fl_str_mv |
Paula, Fernando Rogério de [UNESP] Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Aguiar, Felipe Magalhães de [UNESP] |
dc.subject.por.fl_str_mv |
BSCCO system Replacement Pechini method High critical temperature Supercondutores ceramicos Altas temperaturas Estequiometria Stoichiometry |
topic |
BSCCO system Replacement Pechini method High critical temperature Supercondutores ceramicos Altas temperaturas Estequiometria Stoichiometry |
description |
With high critical temperature superconducting discovered in the 80s, the studies of superconducting materials have intensified in an attempt to obtain materials with Tc increasing, above the temperature of liquid nitrogen (77 K). However, some superconducting materials of high Tc are difficult to be obtained, as in the case of superconducting ceramic compositesof Bi- Sr-Ca-Cu-O (BSCCO) that presents predominant four phases: Bi2Sr2CuO6 (Bi-2201), Bi2Sr2Ca1Cu2O8 (Bi 2212), Bi2Sr2Ca2Cu3O10 (Bi-2223) and Bi2Sr2Ca3Cu4O12 (Bi-2234), with its Tc respectively in the range of 7-22 K, 75-94 K, 100-125 K and 90-100 K. Unfortunately the high-Tc phase (Bi-2223) in this high-temperature superconductor is thermodynamically unstable. One of the used solutions to improve this phase stability is the chemical element substitution. Thus, in this work we study the stabilization of the Bi-2223 phase using the method of chemical element substitution in which the Bi was replaced partially by Pb. For this, the stoichiometry used was Bi2-xPbxSr2Ca2Cu3Oywith x = 0.00; 0.30; 0.35; 0.40; 0.45; 0.50 mol/g. The solutions were prepared by the polymeric precursor method based on the Pechini method. The polymeric resin obtained was thermally treated at 200°C for 10 h.Then the resin was macerated and the powder obtained in this procedure was again thermally treated between 400°C and 810°C. With the resulting powder, pastilles were prepared and soon after were subjected to a new thermal treatment to 845°C for 60 h. Structural characterizations of the samples were investigated by the technique of X-ray diffraction - (XRD); electrical characterization by four-point probe dc conductivity method and chemical characterization by Energy-dispersive X-ray spectroscopy (EDX).The results showed that in the samples prepared with concentrations of 0.00, 0.30 and 0.35 mol/g Pb prevailed the phase Bi -2212, however for the concentration of 0.40 mol/g of Pb the Bi-2223 phase was the... |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-01-30 2019-10-29T15:24:01Z 2019-10-29T15:24:01Z |
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.uri.fl_str_mv |
AGUIAR, Felipe Magalhães de. Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de síntese. 2015. 83 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Engenharia, 2015. http://hdl.handle.net/11449/190896 000917985 http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/12-07-2019/000917985.pdf 33004099083P9 |
identifier_str_mv |
AGUIAR, Felipe Magalhães de. Preparação de supercondutor de alta-Tc no sistema BSCCO com adição de Pb utilizando Método Pechini de síntese. 2015. 83 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Engenharia, 2015. 000917985 33004099083P9 |
url |
http://hdl.handle.net/11449/190896 http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/12-07-2019/000917985.pdf |
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 |
83 f. : il. application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
publisher.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.source.none.fl_str_mv |
Aleph reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1808129352307572736 |