Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route

Detalhes bibliográficos
Autor(a) principal: Fabián, Martin
Data de Publicação: 2019
Outros Autores: Arias-Serrano, Blanca I., Yaremchenko, Aleksey, Kolev, Hristo, Kaňuchová, Mária, Briančin, Jaroslav
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/26439
Resumo: The present work explores mechanosynthesis of lanthanum aluminate-based perovskite ceramics and corresponding effects on ionic-electronic transport properties. La1-xCaxAlO3-δ (x = 0.05-0.20) nanopowders were prepared via one-step high-energy mechanochemical processing. Sintering at 1450°C yielded dense ceramics with submicron grains. As-prepared powders and sintered ceramics were characterized by XRPD, XPS and SEM. Electrochemical studies showed that partial oxygen-ionic conductivity in prepared La1-xCaxAlO3-δ increases with calcium content up to 10 at.% in the lanthanum sublattice and then levels off at ~6×10-3 S/cm at 900°C. La1-xCaxAlO3-δ ceramics are mixed conductors under oxidizing conditions and ionic conductors with negligible contribution of electronic transport in reducing atmospheres. Oxygen-ionic contribution to the total conductivity is 20-68% at 900°C in air and increases with Ca content, with temperature and with reducing p(O2). Impedance spectroscopy results showed however that electrical properties of mechanosynthesized La1-xCaxAlO3-δ ceramics below ~800°C are determined by prevailing grain boundary contribution to the total resistivity.
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spelling Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical routeLanthanum aluminateMechanosynthesisPerovskiteConductivitySolid electrolyteThe present work explores mechanosynthesis of lanthanum aluminate-based perovskite ceramics and corresponding effects on ionic-electronic transport properties. La1-xCaxAlO3-δ (x = 0.05-0.20) nanopowders were prepared via one-step high-energy mechanochemical processing. Sintering at 1450°C yielded dense ceramics with submicron grains. As-prepared powders and sintered ceramics were characterized by XRPD, XPS and SEM. Electrochemical studies showed that partial oxygen-ionic conductivity in prepared La1-xCaxAlO3-δ increases with calcium content up to 10 at.% in the lanthanum sublattice and then levels off at ~6×10-3 S/cm at 900°C. La1-xCaxAlO3-δ ceramics are mixed conductors under oxidizing conditions and ionic conductors with negligible contribution of electronic transport in reducing atmospheres. Oxygen-ionic contribution to the total conductivity is 20-68% at 900°C in air and increases with Ca content, with temperature and with reducing p(O2). Impedance spectroscopy results showed however that electrical properties of mechanosynthesized La1-xCaxAlO3-δ ceramics below ~800°C are determined by prevailing grain boundary contribution to the total resistivity.Elsevier2020-07-23T00:00:00Z2019-01-01T00:00:00Z2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/26439eng0955-221910.1016/j.jeurceramsoc.2019.07.038Fabián, MartinArias-Serrano, Blanca I.Yaremchenko, AlekseyKolev, HristoKaňuchová, MáriaBriančin, Jaroslavinfo: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:RCAAP2024-02-22T11:51:11Zoai:ria.ua.pt:10773/26439Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:59:25.388096Repositório 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 Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route
title Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route
spellingShingle Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route
Fabián, Martin
Lanthanum aluminate
Mechanosynthesis
Perovskite
Conductivity
Solid electrolyte
title_short Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route
title_full Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route
title_fullStr Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route
title_full_unstemmed Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route
title_sort Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route
author Fabián, Martin
author_facet Fabián, Martin
Arias-Serrano, Blanca I.
Yaremchenko, Aleksey
Kolev, Hristo
Kaňuchová, Mária
Briančin, Jaroslav
author_role author
author2 Arias-Serrano, Blanca I.
Yaremchenko, Aleksey
Kolev, Hristo
Kaňuchová, Mária
Briančin, Jaroslav
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Fabián, Martin
Arias-Serrano, Blanca I.
Yaremchenko, Aleksey
Kolev, Hristo
Kaňuchová, Mária
Briančin, Jaroslav
dc.subject.por.fl_str_mv Lanthanum aluminate
Mechanosynthesis
Perovskite
Conductivity
Solid electrolyte
topic Lanthanum aluminate
Mechanosynthesis
Perovskite
Conductivity
Solid electrolyte
description The present work explores mechanosynthesis of lanthanum aluminate-based perovskite ceramics and corresponding effects on ionic-electronic transport properties. La1-xCaxAlO3-δ (x = 0.05-0.20) nanopowders were prepared via one-step high-energy mechanochemical processing. Sintering at 1450°C yielded dense ceramics with submicron grains. As-prepared powders and sintered ceramics were characterized by XRPD, XPS and SEM. Electrochemical studies showed that partial oxygen-ionic conductivity in prepared La1-xCaxAlO3-δ increases with calcium content up to 10 at.% in the lanthanum sublattice and then levels off at ~6×10-3 S/cm at 900°C. La1-xCaxAlO3-δ ceramics are mixed conductors under oxidizing conditions and ionic conductors with negligible contribution of electronic transport in reducing atmospheres. Oxygen-ionic contribution to the total conductivity is 20-68% at 900°C in air and increases with Ca content, with temperature and with reducing p(O2). Impedance spectroscopy results showed however that electrical properties of mechanosynthesized La1-xCaxAlO3-δ ceramics below ~800°C are determined by prevailing grain boundary contribution to the total resistivity.
publishDate 2019
dc.date.none.fl_str_mv 2019-01-01T00:00:00Z
2019
2020-07-23T00:00:00Z
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/10773/26439
url http://hdl.handle.net/10773/26439
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0955-2219
10.1016/j.jeurceramsoc.2019.07.038
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 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
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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