Assessment of the electronic conductivity of core-shell, Fe-doped LSGM ceramics by impedance spectroscopy

Detalhes bibliográficos
Autor(a) principal: Gomes, Eduarda
Data de Publicação: 2011
Outros Autores: Mather, Glenn C., Figueiredo, Filipe M., Marques, Fernando M. B.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/20.500.11960/3013
Resumo: The structure, microstructure and low-temperature electrical properties of core–shell-type mixed conductors based on lanthanum gallate with Fe-doped grain boundaries are analyzed in depth. Electron probe microanalysis revealed that the iron concentration in the grain-boundary regions (shell) is below 1 at.% and their thickness is no more than 1.5 μm. The low-temperature (b400 °C) electronic conductivity is enhanced by up to 2–3 orders of magnitude with respect to the corresponding undoped ceramics, as revealed by the analysis of impedance spectra combined with microstructural information. The electronic transport numbers lie in the range between 0.35 and 0.1 at 275 to 400 °C, decreasing at higher temperatures, where the influence of grain boundaries on the overall transport properties vanishes and the ionic conductivity increases.
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spelling Assessment of the electronic conductivity of core-shell, Fe-doped LSGM ceramics by impedance spectroscopyLanthanum gallateMixed conductorGrain boundary engineeringImpedance spectroscopyElectronic conductivityThe structure, microstructure and low-temperature electrical properties of core–shell-type mixed conductors based on lanthanum gallate with Fe-doped grain boundaries are analyzed in depth. Electron probe microanalysis revealed that the iron concentration in the grain-boundary regions (shell) is below 1 at.% and their thickness is no more than 1.5 μm. The low-temperature (b400 °C) electronic conductivity is enhanced by up to 2–3 orders of magnitude with respect to the corresponding undoped ceramics, as revealed by the analysis of impedance spectra combined with microstructural information. The electronic transport numbers lie in the range between 0.35 and 0.1 at 275 to 400 °C, decreasing at higher temperatures, where the influence of grain boundaries on the overall transport properties vanishes and the ionic conductivity increases.2022-12-20T12:36:29Z2011-01-01T00:00:00Z20112022-12-05T11:27:49Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/20.500.11960/3013eng0167-273810.1016/j.ssi.2011.03.006Gomes, EduardaMather, Glenn C.Figueiredo, Filipe M.Marques, Fernando M. B.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:RCAAP2023-03-21T14:37:31Zoai:repositorio.ipvc.pt:20.500.11960/3013Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:43:42.855560Repositório 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 Assessment of the electronic conductivity of core-shell, Fe-doped LSGM ceramics by impedance spectroscopy
title Assessment of the electronic conductivity of core-shell, Fe-doped LSGM ceramics by impedance spectroscopy
spellingShingle Assessment of the electronic conductivity of core-shell, Fe-doped LSGM ceramics by impedance spectroscopy
Gomes, Eduarda
Lanthanum gallate
Mixed conductor
Grain boundary engineering
Impedance spectroscopy
Electronic conductivity
title_short Assessment of the electronic conductivity of core-shell, Fe-doped LSGM ceramics by impedance spectroscopy
title_full Assessment of the electronic conductivity of core-shell, Fe-doped LSGM ceramics by impedance spectroscopy
title_fullStr Assessment of the electronic conductivity of core-shell, Fe-doped LSGM ceramics by impedance spectroscopy
title_full_unstemmed Assessment of the electronic conductivity of core-shell, Fe-doped LSGM ceramics by impedance spectroscopy
title_sort Assessment of the electronic conductivity of core-shell, Fe-doped LSGM ceramics by impedance spectroscopy
author Gomes, Eduarda
author_facet Gomes, Eduarda
Mather, Glenn C.
Figueiredo, Filipe M.
Marques, Fernando M. B.
author_role author
author2 Mather, Glenn C.
Figueiredo, Filipe M.
Marques, Fernando M. B.
author2_role author
author
author
dc.contributor.author.fl_str_mv Gomes, Eduarda
Mather, Glenn C.
Figueiredo, Filipe M.
Marques, Fernando M. B.
dc.subject.por.fl_str_mv Lanthanum gallate
Mixed conductor
Grain boundary engineering
Impedance spectroscopy
Electronic conductivity
topic Lanthanum gallate
Mixed conductor
Grain boundary engineering
Impedance spectroscopy
Electronic conductivity
description The structure, microstructure and low-temperature electrical properties of core–shell-type mixed conductors based on lanthanum gallate with Fe-doped grain boundaries are analyzed in depth. Electron probe microanalysis revealed that the iron concentration in the grain-boundary regions (shell) is below 1 at.% and their thickness is no more than 1.5 μm. The low-temperature (b400 °C) electronic conductivity is enhanced by up to 2–3 orders of magnitude with respect to the corresponding undoped ceramics, as revealed by the analysis of impedance spectra combined with microstructural information. The electronic transport numbers lie in the range between 0.35 and 0.1 at 275 to 400 °C, decreasing at higher temperatures, where the influence of grain boundaries on the overall transport properties vanishes and the ionic conductivity increases.
publishDate 2011
dc.date.none.fl_str_mv 2011-01-01T00:00:00Z
2011
2022-12-20T12:36:29Z
2022-12-05T11:27:49Z
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/20.500.11960/3013
url http://hdl.handle.net/20.500.11960/3013
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0167-2738
10.1016/j.ssi.2011.03.006
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
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