Electrical conductivity and thermal expansion of Ln-substituted SrTiO3 for solid oxide cell electrodes and interconnects: the effect of rare-earth cation size
Autor(a) principal: | |
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Data de Publicação: | 2020 |
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/10773/29078 |
Resumo: | The present work aims to evaluate relevant effects of the size of substituting rare-earth cation on electrical conductivity and thermal expansion of donor-doped SrTiO3 as ceramic components of electrochemical solid electrolyte cells. A series of strontium titanate-based ceramics with a moderate doping level and different cation stoichiometry, Sr0.90Ln0.10TiO3±δ and Sr0.85Ln0.10TiO3±δ (Ln = La-Yb), are prepared under identical conditions with the final reductive treatment in 10%H2-N2 atmosphere at 1500°C for 10 h. The solubility of rare-earth cations in the strontium sublattice of perovskite-type SrTiO3 is found to decrease with reducing ionic radius leading to a segregation of secondary pyrochlore-type Ln2Ti2O7 phase in the case of smaller rare-earth cations (Ln = Dy-Yb). The results of electrical, dilatometric and thermogravimetric studies suggest that the size of donor Ln3+ cation and cation stoichiometry have no evident impact on the electrical conductivity or thermal expansion behavior as long as the content of Ln3+ is within the solubility limits. All reduced donor-doped titanate ceramics (except Yb-doped) show a similar level of electrical conductivity, 100-155 S cm-1 at 800°C, determined by the content of Ln3+ in the strontium sublattice, and moderate thermal expansion coefficients, 11.9-12.1 ppm K-1 at 25-1100°C, compatible with that of conventional solid electrolytes. |
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Electrical conductivity and thermal expansion of Ln-substituted SrTiO3 for solid oxide cell electrodes and interconnects: the effect of rare-earth cation sizePerovskiteStrontium titanateElectrical conductivityThermal expansionFuel electrodeInterconnectThe present work aims to evaluate relevant effects of the size of substituting rare-earth cation on electrical conductivity and thermal expansion of donor-doped SrTiO3 as ceramic components of electrochemical solid electrolyte cells. A series of strontium titanate-based ceramics with a moderate doping level and different cation stoichiometry, Sr0.90Ln0.10TiO3±δ and Sr0.85Ln0.10TiO3±δ (Ln = La-Yb), are prepared under identical conditions with the final reductive treatment in 10%H2-N2 atmosphere at 1500°C for 10 h. The solubility of rare-earth cations in the strontium sublattice of perovskite-type SrTiO3 is found to decrease with reducing ionic radius leading to a segregation of secondary pyrochlore-type Ln2Ti2O7 phase in the case of smaller rare-earth cations (Ln = Dy-Yb). The results of electrical, dilatometric and thermogravimetric studies suggest that the size of donor Ln3+ cation and cation stoichiometry have no evident impact on the electrical conductivity or thermal expansion behavior as long as the content of Ln3+ is within the solubility limits. All reduced donor-doped titanate ceramics (except Yb-doped) show a similar level of electrical conductivity, 100-155 S cm-1 at 800°C, determined by the content of Ln3+ in the strontium sublattice, and moderate thermal expansion coefficients, 11.9-12.1 ppm K-1 at 25-1100°C, compatible with that of conventional solid electrolytes.Elsevier2022-10-31T00:00:00Z2020-10-31T00:00:00Z2020-10-31info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/29078eng0378-775310.1016/j.jpowsour.2020.228531Yaremchenko, Aleksey A.Macías, JavierKovalevsky, Andrei V.Arias-Serrano, Blanca I.Frade, Jorge R.info:eu-repo/semantics/embargoedAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T11:56:15Zoai:ria.ua.pt:10773/29078Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:01:30.182828Repositório 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 |
Electrical conductivity and thermal expansion of Ln-substituted SrTiO3 for solid oxide cell electrodes and interconnects: the effect of rare-earth cation size |
title |
Electrical conductivity and thermal expansion of Ln-substituted SrTiO3 for solid oxide cell electrodes and interconnects: the effect of rare-earth cation size |
spellingShingle |
Electrical conductivity and thermal expansion of Ln-substituted SrTiO3 for solid oxide cell electrodes and interconnects: the effect of rare-earth cation size Yaremchenko, Aleksey A. Perovskite Strontium titanate Electrical conductivity Thermal expansion Fuel electrode Interconnect |
title_short |
Electrical conductivity and thermal expansion of Ln-substituted SrTiO3 for solid oxide cell electrodes and interconnects: the effect of rare-earth cation size |
title_full |
Electrical conductivity and thermal expansion of Ln-substituted SrTiO3 for solid oxide cell electrodes and interconnects: the effect of rare-earth cation size |
title_fullStr |
Electrical conductivity and thermal expansion of Ln-substituted SrTiO3 for solid oxide cell electrodes and interconnects: the effect of rare-earth cation size |
title_full_unstemmed |
Electrical conductivity and thermal expansion of Ln-substituted SrTiO3 for solid oxide cell electrodes and interconnects: the effect of rare-earth cation size |
title_sort |
Electrical conductivity and thermal expansion of Ln-substituted SrTiO3 for solid oxide cell electrodes and interconnects: the effect of rare-earth cation size |
author |
Yaremchenko, Aleksey A. |
author_facet |
Yaremchenko, Aleksey A. Macías, Javier Kovalevsky, Andrei V. Arias-Serrano, Blanca I. Frade, Jorge R. |
author_role |
author |
author2 |
Macías, Javier Kovalevsky, Andrei V. Arias-Serrano, Blanca I. Frade, Jorge R. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Yaremchenko, Aleksey A. Macías, Javier Kovalevsky, Andrei V. Arias-Serrano, Blanca I. Frade, Jorge R. |
dc.subject.por.fl_str_mv |
Perovskite Strontium titanate Electrical conductivity Thermal expansion Fuel electrode Interconnect |
topic |
Perovskite Strontium titanate Electrical conductivity Thermal expansion Fuel electrode Interconnect |
description |
The present work aims to evaluate relevant effects of the size of substituting rare-earth cation on electrical conductivity and thermal expansion of donor-doped SrTiO3 as ceramic components of electrochemical solid electrolyte cells. A series of strontium titanate-based ceramics with a moderate doping level and different cation stoichiometry, Sr0.90Ln0.10TiO3±δ and Sr0.85Ln0.10TiO3±δ (Ln = La-Yb), are prepared under identical conditions with the final reductive treatment in 10%H2-N2 atmosphere at 1500°C for 10 h. The solubility of rare-earth cations in the strontium sublattice of perovskite-type SrTiO3 is found to decrease with reducing ionic radius leading to a segregation of secondary pyrochlore-type Ln2Ti2O7 phase in the case of smaller rare-earth cations (Ln = Dy-Yb). The results of electrical, dilatometric and thermogravimetric studies suggest that the size of donor Ln3+ cation and cation stoichiometry have no evident impact on the electrical conductivity or thermal expansion behavior as long as the content of Ln3+ is within the solubility limits. All reduced donor-doped titanate ceramics (except Yb-doped) show a similar level of electrical conductivity, 100-155 S cm-1 at 800°C, determined by the content of Ln3+ in the strontium sublattice, and moderate thermal expansion coefficients, 11.9-12.1 ppm K-1 at 25-1100°C, compatible with that of conventional solid electrolytes. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-10-31T00:00:00Z 2020-10-31 2022-10-31T00:00:00Z |
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 |
http://hdl.handle.net/10773/29078 |
url |
http://hdl.handle.net/10773/29078 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0378-7753 10.1016/j.jpowsour.2020.228531 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/embargoedAccess |
eu_rights_str_mv |
embargoedAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
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 |
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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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1799137671004553217 |