Microstructural effects on the electrical properties of grain boundary Fe-doped LSGM

Detalhes bibliográficos
Autor(a) principal: Gomes, Eduarda
Data de Publicação: 2008
Outros Autores: Marques, F. M. B., Figueiredo, F. M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/20.500.11960/3051
Resumo: Mixed conductors based on grain boundary Fe-doped La0.95Sr0.05Ga0.90Mg0.10O3 − δ (LSGM) ceramics were obtained by selectively doping the grain boundaries with Fe. This was achieved using LaFeO3 − δ layers screen-printed onto LSGM, after annealing at high temperature in air for several hours to promote Fe diffusion into LSGM. The influence of the number of impregnation cycles, temperature of impregnation and microstructure of the host LSGM was evaluated by impedance spectroscopy and oxygen permeability. The impedance spectra consist of high and low frequency semicircles, ascribed to bulk and grain boundaries. The amplitude of both contributions decreases with increasing impregnation temperature and time, suggesting the onset of electronic conduction along grain boundaries. The effect is stronger for ceramics with larger grain size. The observed trends are fully consistent with estimates of p-type electronic conductivity obtained from oxygen permeability measurements using a simplified electrochemical cell.
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spelling Microstructural effects on the electrical properties of grain boundary Fe-doped LSGMLanthanum gallateGrain boundaryMixed conductorImpedance spectroscopyOxygen permeabilityMixed conductors based on grain boundary Fe-doped La0.95Sr0.05Ga0.90Mg0.10O3 − δ (LSGM) ceramics were obtained by selectively doping the grain boundaries with Fe. This was achieved using LaFeO3 − δ layers screen-printed onto LSGM, after annealing at high temperature in air for several hours to promote Fe diffusion into LSGM. The influence of the number of impregnation cycles, temperature of impregnation and microstructure of the host LSGM was evaluated by impedance spectroscopy and oxygen permeability. The impedance spectra consist of high and low frequency semicircles, ascribed to bulk and grain boundaries. The amplitude of both contributions decreases with increasing impregnation temperature and time, suggesting the onset of electronic conduction along grain boundaries. The effect is stronger for ceramics with larger grain size. The observed trends are fully consistent with estimates of p-type electronic conductivity obtained from oxygen permeability measurements using a simplified electrochemical cell.2022-12-29T15:35:00Z2008-01-01T00:00:00Z20082022-12-05T11:33:06Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/20.500.11960/3051eng0167-273810.1016/j.ssi.2008.01.073Gomes, EduardaMarques, F. M. B.Figueiredo, F. M.info: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:RCAAP2024-04-11T08:09:05Zoai:repositorio.ipvc.pt:20.500.11960/3051Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-04-11T08:09:05Repositório 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 Microstructural effects on the electrical properties of grain boundary Fe-doped LSGM
title Microstructural effects on the electrical properties of grain boundary Fe-doped LSGM
spellingShingle Microstructural effects on the electrical properties of grain boundary Fe-doped LSGM
Gomes, Eduarda
Lanthanum gallate
Grain boundary
Mixed conductor
Impedance spectroscopy
Oxygen permeability
title_short Microstructural effects on the electrical properties of grain boundary Fe-doped LSGM
title_full Microstructural effects on the electrical properties of grain boundary Fe-doped LSGM
title_fullStr Microstructural effects on the electrical properties of grain boundary Fe-doped LSGM
title_full_unstemmed Microstructural effects on the electrical properties of grain boundary Fe-doped LSGM
title_sort Microstructural effects on the electrical properties of grain boundary Fe-doped LSGM
author Gomes, Eduarda
author_facet Gomes, Eduarda
Marques, F. M. B.
Figueiredo, F. M.
author_role author
author2 Marques, F. M. B.
Figueiredo, F. M.
author2_role author
author
dc.contributor.author.fl_str_mv Gomes, Eduarda
Marques, F. M. B.
Figueiredo, F. M.
dc.subject.por.fl_str_mv Lanthanum gallate
Grain boundary
Mixed conductor
Impedance spectroscopy
Oxygen permeability
topic Lanthanum gallate
Grain boundary
Mixed conductor
Impedance spectroscopy
Oxygen permeability
description Mixed conductors based on grain boundary Fe-doped La0.95Sr0.05Ga0.90Mg0.10O3 − δ (LSGM) ceramics were obtained by selectively doping the grain boundaries with Fe. This was achieved using LaFeO3 − δ layers screen-printed onto LSGM, after annealing at high temperature in air for several hours to promote Fe diffusion into LSGM. The influence of the number of impregnation cycles, temperature of impregnation and microstructure of the host LSGM was evaluated by impedance spectroscopy and oxygen permeability. The impedance spectra consist of high and low frequency semicircles, ascribed to bulk and grain boundaries. The amplitude of both contributions decreases with increasing impregnation temperature and time, suggesting the onset of electronic conduction along grain boundaries. The effect is stronger for ceramics with larger grain size. The observed trends are fully consistent with estimates of p-type electronic conductivity obtained from oxygen permeability measurements using a simplified electrochemical cell.
publishDate 2008
dc.date.none.fl_str_mv 2008-01-01T00:00:00Z
2008
2022-12-29T15:35:00Z
2022-12-05T11:33:06Z
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 http://hdl.handle.net/20.500.11960/3051
url http://hdl.handle.net/20.500.11960/3051
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0167-2738
10.1016/j.ssi.2008.01.073
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.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 mluisa.alvim@gmail.com
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