Grain boundary Fe-doping effects in LSGM
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/20.500.11960/3049 |
Resumo: | The electrical properties of La0.95Sr0.05Ga0.90Mg0.10O3 − δ (LSGM) were modified by selective doping of the grain boundaries, using LaFeO3 screen-printed layers and annealing at high temperature to promote Fe diffusion into LSGM. Scanning electron microscopy (SEM) and energydispersive spectroscopy (EDS) analyses showed that iron was mainly located along the grain boundaries with the bulk grain composition almost unchanged. Impedance spectra showed a significant increase in the total conductivity for the Fe-doped samples, the effect being greater for the grain boundary contribution. The formation of a parallel pathway for electronic conduction along the grain boundaries explains these effects. Ageing of these samples at high temperature, after removal of the Fe source, showed a steady shift to the original LSGM behaviour, due to dilution of Fe throughout the samples. |
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Grain boundary Fe-doping effects in LSGMLanthanum gallateGrain boundaryMixed conductorImpedance spectroscopyThe electrical properties of La0.95Sr0.05Ga0.90Mg0.10O3 − δ (LSGM) were modified by selective doping of the grain boundaries, using LaFeO3 screen-printed layers and annealing at high temperature to promote Fe diffusion into LSGM. Scanning electron microscopy (SEM) and energydispersive spectroscopy (EDS) analyses showed that iron was mainly located along the grain boundaries with the bulk grain composition almost unchanged. Impedance spectra showed a significant increase in the total conductivity for the Fe-doped samples, the effect being greater for the grain boundary contribution. The formation of a parallel pathway for electronic conduction along the grain boundaries explains these effects. Ageing of these samples at high temperature, after removal of the Fe source, showed a steady shift to the original LSGM behaviour, due to dilution of Fe throughout the samples.2022-12-29T15:18:24Z2008-01-01T00:00:00Z20082022-12-05T11:31:46Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/20.500.11960/3049eng0167-273810.1016/j.ssi.2008.01.057Gomes, EduardaFigueiredo, F. M.Marques, F. 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:RCAAP2023-03-21T14:42:53Zoai:repositorio.ipvc.pt:20.500.11960/3049Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:44:30.448363Repositório 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 |
Grain boundary Fe-doping effects in LSGM |
title |
Grain boundary Fe-doping effects in LSGM |
spellingShingle |
Grain boundary Fe-doping effects in LSGM Gomes, Eduarda Lanthanum gallate Grain boundary Mixed conductor Impedance spectroscopy |
title_short |
Grain boundary Fe-doping effects in LSGM |
title_full |
Grain boundary Fe-doping effects in LSGM |
title_fullStr |
Grain boundary Fe-doping effects in LSGM |
title_full_unstemmed |
Grain boundary Fe-doping effects in LSGM |
title_sort |
Grain boundary Fe-doping effects in LSGM |
author |
Gomes, Eduarda |
author_facet |
Gomes, Eduarda Figueiredo, F. M. Marques, F. M. B. |
author_role |
author |
author2 |
Figueiredo, F. M. Marques, F. M. B. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Gomes, Eduarda Figueiredo, F. M. Marques, F. M. B. |
dc.subject.por.fl_str_mv |
Lanthanum gallate Grain boundary Mixed conductor Impedance spectroscopy |
topic |
Lanthanum gallate Grain boundary Mixed conductor Impedance spectroscopy |
description |
The electrical properties of La0.95Sr0.05Ga0.90Mg0.10O3 − δ (LSGM) were modified by selective doping of the grain boundaries, using LaFeO3 screen-printed layers and annealing at high temperature to promote Fe diffusion into LSGM. Scanning electron microscopy (SEM) and energydispersive spectroscopy (EDS) analyses showed that iron was mainly located along the grain boundaries with the bulk grain composition almost unchanged. Impedance spectra showed a significant increase in the total conductivity for the Fe-doped samples, the effect being greater for the grain boundary contribution. The formation of a parallel pathway for electronic conduction along the grain boundaries explains these effects. Ageing of these samples at high temperature, after removal of the Fe source, showed a steady shift to the original LSGM behaviour, due to dilution of Fe throughout the samples. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-01-01T00:00:00Z 2008 2022-12-29T15:18:24Z 2022-12-05T11:31:46Z |
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/20.500.11960/3049 |
url |
http://hdl.handle.net/20.500.11960/3049 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0167-2738 10.1016/j.ssi.2008.01.057 |
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 |
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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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1799131530084220928 |