Electrical assessment of brownmillerite-type calcium ferrite materials obtained by proteic sol-gel route and by solid-state reaction using mollusk shells

Detalhes bibliográficos
Autor(a) principal: Lima, Chrystian G. M.
Data de Publicação: 2021
Outros Autores: Araújo, Allan J. M., Silva, Rinaldo M., Raimundo, Rafael A., Grilo, João P. F., Constantinescu, Gabriel, Kovalevsky, Andrei V., Macedo, Daniel A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/31716
Resumo: In this work, brownmillerite-type calcium ferrite (Ca2Fe2O5) ceramics were prepared by two distinct routes, namely by a proteic sol-gel synthesis using commercial flavorless gelatin, and by a solid-state reaction method using mollusk shells. XRD analyses revealed single phase brownmillerite-type calcium ferrites in both cases. SEMEDS analysis of sintered Ca2Fe2O5 ceramics revealed larger grain sizes for the samples prepared via the solid-state reaction. All samples possessed a p-type conduction mechanism, with the largest power factor of ~2 μW m-1 K 2 at 450 C observed for the samples obtained via the solid state reaction. The charge transport mechanism was found to depend on the preparation route. The obtained results demonstrated that the proposed synthesis routes can be successfully employed for the preparation of single-phase brownmillerite-type materials.
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spelling Electrical assessment of brownmillerite-type calcium ferrite materials obtained by proteic sol-gel route and by solid-state reaction using mollusk shellsCa2Fe2O5Proteic sol-gel synthesisSolid-state reactionMollusk shellsElectrical propertiesIn this work, brownmillerite-type calcium ferrite (Ca2Fe2O5) ceramics were prepared by two distinct routes, namely by a proteic sol-gel synthesis using commercial flavorless gelatin, and by a solid-state reaction method using mollusk shells. XRD analyses revealed single phase brownmillerite-type calcium ferrites in both cases. SEMEDS analysis of sintered Ca2Fe2O5 ceramics revealed larger grain sizes for the samples prepared via the solid-state reaction. All samples possessed a p-type conduction mechanism, with the largest power factor of ~2 μW m-1 K 2 at 450 C observed for the samples obtained via the solid state reaction. The charge transport mechanism was found to depend on the preparation route. The obtained results demonstrated that the proposed synthesis routes can be successfully employed for the preparation of single-phase brownmillerite-type materials.Elsevier2021-072021-07-01T00:00:00Z2023-04-03T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/31716eng0022-459610.1016/j.jssc.2021.122172Lima, Chrystian G. M.Araújo, Allan J. M.Silva, Rinaldo M.Raimundo, Rafael A.Grilo, João P. F.Constantinescu, GabrielKovalevsky, Andrei V.Macedo, Daniel A.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:RCAAP2023-07-17T04:09:59ZPortal AgregadorONG
dc.title.none.fl_str_mv Electrical assessment of brownmillerite-type calcium ferrite materials obtained by proteic sol-gel route and by solid-state reaction using mollusk shells
title Electrical assessment of brownmillerite-type calcium ferrite materials obtained by proteic sol-gel route and by solid-state reaction using mollusk shells
spellingShingle Electrical assessment of brownmillerite-type calcium ferrite materials obtained by proteic sol-gel route and by solid-state reaction using mollusk shells
Lima, Chrystian G. M.
Ca2Fe2O5
Proteic sol-gel synthesis
Solid-state reaction
Mollusk shells
Electrical properties
title_short Electrical assessment of brownmillerite-type calcium ferrite materials obtained by proteic sol-gel route and by solid-state reaction using mollusk shells
title_full Electrical assessment of brownmillerite-type calcium ferrite materials obtained by proteic sol-gel route and by solid-state reaction using mollusk shells
title_fullStr Electrical assessment of brownmillerite-type calcium ferrite materials obtained by proteic sol-gel route and by solid-state reaction using mollusk shells
title_full_unstemmed Electrical assessment of brownmillerite-type calcium ferrite materials obtained by proteic sol-gel route and by solid-state reaction using mollusk shells
title_sort Electrical assessment of brownmillerite-type calcium ferrite materials obtained by proteic sol-gel route and by solid-state reaction using mollusk shells
author Lima, Chrystian G. M.
author_facet Lima, Chrystian G. M.
Araújo, Allan J. M.
Silva, Rinaldo M.
Raimundo, Rafael A.
Grilo, João P. F.
Constantinescu, Gabriel
Kovalevsky, Andrei V.
Macedo, Daniel A.
author_role author
author2 Araújo, Allan J. M.
Silva, Rinaldo M.
Raimundo, Rafael A.
Grilo, João P. F.
Constantinescu, Gabriel
Kovalevsky, Andrei V.
Macedo, Daniel A.
author2_role author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Lima, Chrystian G. M.
Araújo, Allan J. M.
Silva, Rinaldo M.
Raimundo, Rafael A.
Grilo, João P. F.
Constantinescu, Gabriel
Kovalevsky, Andrei V.
Macedo, Daniel A.
dc.subject.por.fl_str_mv Ca2Fe2O5
Proteic sol-gel synthesis
Solid-state reaction
Mollusk shells
Electrical properties
topic Ca2Fe2O5
Proteic sol-gel synthesis
Solid-state reaction
Mollusk shells
Electrical properties
description In this work, brownmillerite-type calcium ferrite (Ca2Fe2O5) ceramics were prepared by two distinct routes, namely by a proteic sol-gel synthesis using commercial flavorless gelatin, and by a solid-state reaction method using mollusk shells. XRD analyses revealed single phase brownmillerite-type calcium ferrites in both cases. SEMEDS analysis of sintered Ca2Fe2O5 ceramics revealed larger grain sizes for the samples prepared via the solid-state reaction. All samples possessed a p-type conduction mechanism, with the largest power factor of ~2 μW m-1 K 2 at 450 C observed for the samples obtained via the solid state reaction. The charge transport mechanism was found to depend on the preparation route. The obtained results demonstrated that the proposed synthesis routes can be successfully employed for the preparation of single-phase brownmillerite-type materials.
publishDate 2021
dc.date.none.fl_str_mv 2021-07
2021-07-01T00:00:00Z
2023-04-03T00:00:00Z
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/10773/31716
url http://hdl.handle.net/10773/31716
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0022-4596
10.1016/j.jssc.2021.122172
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)
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