Temperature dependence of the dielectric permittivity of BaTiO3-CoFe2O4 ceramic composites

Detalhes bibliográficos
Autor(a) principal: Barbosa, José Gusman
Data de Publicação: 2008
Outros Autores: Almeida, B. G., Araújo, C., Mendes, J. A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: https://hdl.handle.net/1822/85610
Resumo: Two-phase ceramic composites of cobalt ferrite dispersed in a barium titanate matrix were prepared and their dielectric permittivity was characterized. A rounding of their dielectric constant near the ferroelectric transition temperature of the BaTiO3 phase was observed. A generalized brick-wall model, taking into account the BaTiO3 contribution, fitted with the Landau-Devonshire theory, and the CoFe2O4 permittivity, experimentally determined, was used in order to obtain their effective dielectric constant. The effective model was applied to the discussion and fitting of the temperature dependence of the dielectric permittivity of the composites. The Landau-Devonshire coefficients for the BaTiO3 phase were also obtained.
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spelling Temperature dependence of the dielectric permittivity of BaTiO3-CoFe2O4 ceramic compositesBaTiO3-CoFe2O4compositesdielectric propertieseffective mediumBaTiO -CoFe O 3 2 4Ciências Naturais::Ciências FísicasScience & TechnologyTwo-phase ceramic composites of cobalt ferrite dispersed in a barium titanate matrix were prepared and their dielectric permittivity was characterized. A rounding of their dielectric constant near the ferroelectric transition temperature of the BaTiO3 phase was observed. A generalized brick-wall model, taking into account the BaTiO3 contribution, fitted with the Landau-Devonshire theory, and the CoFe2O4 permittivity, experimentally determined, was used in order to obtain their effective dielectric constant. The effective model was applied to the discussion and fitting of the temperature dependence of the dielectric permittivity of the composites. The Landau-Devonshire coefficients for the BaTiO3 phase were also obtained.This work has been financially supported by the Portuguese Foundation for Science and Technology (FCT), through the project POCI/CTM/60181/2004.Taylor & FrancisUniversidade do MinhoBarbosa, José GusmanAlmeida, B. G.Araújo, C.Mendes, J. A.20082008-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/1822/85610engBarbosa, J. G., Almeida, B. G., Araujo, C., & Mendes, J. A. (2008, October 21). Temperature Dependence of the Dielectric Permittivity of BaTiO3-CoFe2O4 Ceramic Composites. Ferroelectrics. Informa UK Limited. http://doi.org/10.1080/001501908023655900015-01931563-511210.1080/00150190802365590https://doi.org/10.1080/00150190802365590info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-29T01:19:59Zoai:repositorium.sdum.uminho.pt:1822/85610Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:54:20.632922Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Temperature dependence of the dielectric permittivity of BaTiO3-CoFe2O4 ceramic composites
title Temperature dependence of the dielectric permittivity of BaTiO3-CoFe2O4 ceramic composites
spellingShingle Temperature dependence of the dielectric permittivity of BaTiO3-CoFe2O4 ceramic composites
Barbosa, José Gusman
BaTiO3-CoFe2O4
composites
dielectric properties
effective medium
BaTiO -CoFe O 3 2 4
Ciências Naturais::Ciências Físicas
Science & Technology
title_short Temperature dependence of the dielectric permittivity of BaTiO3-CoFe2O4 ceramic composites
title_full Temperature dependence of the dielectric permittivity of BaTiO3-CoFe2O4 ceramic composites
title_fullStr Temperature dependence of the dielectric permittivity of BaTiO3-CoFe2O4 ceramic composites
title_full_unstemmed Temperature dependence of the dielectric permittivity of BaTiO3-CoFe2O4 ceramic composites
title_sort Temperature dependence of the dielectric permittivity of BaTiO3-CoFe2O4 ceramic composites
author Barbosa, José Gusman
author_facet Barbosa, José Gusman
Almeida, B. G.
Araújo, C.
Mendes, J. A.
author_role author
author2 Almeida, B. G.
Araújo, C.
Mendes, J. A.
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Barbosa, José Gusman
Almeida, B. G.
Araújo, C.
Mendes, J. A.
dc.subject.por.fl_str_mv BaTiO3-CoFe2O4
composites
dielectric properties
effective medium
BaTiO -CoFe O 3 2 4
Ciências Naturais::Ciências Físicas
Science & Technology
topic BaTiO3-CoFe2O4
composites
dielectric properties
effective medium
BaTiO -CoFe O 3 2 4
Ciências Naturais::Ciências Físicas
Science & Technology
description Two-phase ceramic composites of cobalt ferrite dispersed in a barium titanate matrix were prepared and their dielectric permittivity was characterized. A rounding of their dielectric constant near the ferroelectric transition temperature of the BaTiO3 phase was observed. A generalized brick-wall model, taking into account the BaTiO3 contribution, fitted with the Landau-Devonshire theory, and the CoFe2O4 permittivity, experimentally determined, was used in order to obtain their effective dielectric constant. The effective model was applied to the discussion and fitting of the temperature dependence of the dielectric permittivity of the composites. The Landau-Devonshire coefficients for the BaTiO3 phase were also obtained.
publishDate 2008
dc.date.none.fl_str_mv 2008
2008-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://hdl.handle.net/1822/85610
url https://hdl.handle.net/1822/85610
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Barbosa, J. G., Almeida, B. G., Araujo, C., & Mendes, J. A. (2008, October 21). Temperature Dependence of the Dielectric Permittivity of BaTiO3-CoFe2O4 Ceramic Composites. Ferroelectrics. Informa UK Limited. http://doi.org/10.1080/00150190802365590
0015-0193
1563-5112
10.1080/00150190802365590
https://doi.org/10.1080/00150190802365590
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 Taylor & Francis
publisher.none.fl_str_mv Taylor & Francis
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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