Prospects for electrical performance tuning in Ca3Co4O9 materials by metallic Fe and Ni particles additions

Detalhes bibliográficos
Autor(a) principal: Constantinescu, Gabriel
Data de Publicação: 2021
Outros Autores: Mikhalev, Sergey M., Lisenkov, Aleksey D., Lopes, Daniela V., Sarabando, Artur R., Ferro, Marta C., Silva, Tiago F. da, Sergiienko, Sergii A., Kovalevski, Andrei V.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/30705
Resumo: This work further explores the possibilities for designing the high-temperature electrical performance of the thermoelectric Ca3Co4O9 phase, by a composite approach involving separate metallic iron and nickel particles additions, and by employing two different sintering schemes, capable to promote the controlled interactions between the components, encouraged by our recent promising results obtained for similar cobalt additions. Iron and nickel were chosen because of their similarities with cobalt. The maximum power factor value of around 200 µWm−1K−2 at 925 K was achieved for the composite with the nominal nickel content of 3% vol., processed via the twostep sintering cycle, which provides the highest densification from this work. The effectiveness of the proposed approach was shown to be strongly dependent on the processing conditions and added amounts of metallic particles. Although the conventional one-step approach results in Feand Ni-containing composites with the major content of the thermoelectric Ca3Co4O9 phase, their electrical performance was found to be significantly lower than for the Co-containing analogue, due to the presence of less-conducting phases and excessive porosity. In contrast, the relatively high performance of the composite with a nominal nickel content of 3% vol. processed via a two-step approach is related to the specific microstructural features from this sample, including minimal porosity and the presence of the Ca2Co2O5 phase, which partially compensate the complete decomposition of the Ca3Co4O9 matrix. The obtained results demonstrate different pathways to tailor the phase composition of Ca3Co4O9 -based materials, with a corresponding impact on the thermoelectric performance, and highlight the necessity of more controllable approaches for the phase composition tuning, including lower amounts and different morphologies of the dispersed metallic phases.
id RCAP_76b8e559e3342175048d8505436c11cd
oai_identifier_str oai:ria.ua.pt:10773/30705
network_acronym_str RCAP
network_name_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository_id_str 7160
spelling Prospects for electrical performance tuning in Ca3Co4O9 materials by metallic Fe and Ni particles additionsThermoelectric cobaltitesElectrical performanceComposite approachTransition metals additionsControlled interactionsThis work further explores the possibilities for designing the high-temperature electrical performance of the thermoelectric Ca3Co4O9 phase, by a composite approach involving separate metallic iron and nickel particles additions, and by employing two different sintering schemes, capable to promote the controlled interactions between the components, encouraged by our recent promising results obtained for similar cobalt additions. Iron and nickel were chosen because of their similarities with cobalt. The maximum power factor value of around 200 µWm−1K−2 at 925 K was achieved for the composite with the nominal nickel content of 3% vol., processed via the twostep sintering cycle, which provides the highest densification from this work. The effectiveness of the proposed approach was shown to be strongly dependent on the processing conditions and added amounts of metallic particles. Although the conventional one-step approach results in Feand Ni-containing composites with the major content of the thermoelectric Ca3Co4O9 phase, their electrical performance was found to be significantly lower than for the Co-containing analogue, due to the presence of less-conducting phases and excessive porosity. In contrast, the relatively high performance of the composite with a nominal nickel content of 3% vol. processed via a two-step approach is related to the specific microstructural features from this sample, including minimal porosity and the presence of the Ca2Co2O5 phase, which partially compensate the complete decomposition of the Ca3Co4O9 matrix. The obtained results demonstrate different pathways to tailor the phase composition of Ca3Co4O9 -based materials, with a corresponding impact on the thermoelectric performance, and highlight the necessity of more controllable approaches for the phase composition tuning, including lower amounts and different morphologies of the dispersed metallic phases.MDPI2021-03-01T15:45:04Z2021-02-19T00:00:00Z2021-02-19info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/30705eng1996-194410.3390/ma14040980Constantinescu, GabrielMikhalev, Sergey M.Lisenkov, Aleksey D.Lopes, Daniela V.Sarabando, Artur R.Ferro, Marta C.Silva, Tiago F. daSergiienko, Sergii A.Kovalevski, Andrei V.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:RCAAP2024-02-22T11:59:14Zoai:ria.ua.pt:10773/30705Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:02:42.314926Repositório 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 Prospects for electrical performance tuning in Ca3Co4O9 materials by metallic Fe and Ni particles additions
title Prospects for electrical performance tuning in Ca3Co4O9 materials by metallic Fe and Ni particles additions
spellingShingle Prospects for electrical performance tuning in Ca3Co4O9 materials by metallic Fe and Ni particles additions
Constantinescu, Gabriel
Thermoelectric cobaltites
Electrical performance
Composite approach
Transition metals additions
Controlled interactions
title_short Prospects for electrical performance tuning in Ca3Co4O9 materials by metallic Fe and Ni particles additions
title_full Prospects for electrical performance tuning in Ca3Co4O9 materials by metallic Fe and Ni particles additions
title_fullStr Prospects for electrical performance tuning in Ca3Co4O9 materials by metallic Fe and Ni particles additions
title_full_unstemmed Prospects for electrical performance tuning in Ca3Co4O9 materials by metallic Fe and Ni particles additions
title_sort Prospects for electrical performance tuning in Ca3Co4O9 materials by metallic Fe and Ni particles additions
author Constantinescu, Gabriel
author_facet Constantinescu, Gabriel
Mikhalev, Sergey M.
Lisenkov, Aleksey D.
Lopes, Daniela V.
Sarabando, Artur R.
Ferro, Marta C.
Silva, Tiago F. da
Sergiienko, Sergii A.
Kovalevski, Andrei V.
author_role author
author2 Mikhalev, Sergey M.
Lisenkov, Aleksey D.
Lopes, Daniela V.
Sarabando, Artur R.
Ferro, Marta C.
Silva, Tiago F. da
Sergiienko, Sergii A.
Kovalevski, Andrei V.
author2_role author
author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Constantinescu, Gabriel
Mikhalev, Sergey M.
Lisenkov, Aleksey D.
Lopes, Daniela V.
Sarabando, Artur R.
Ferro, Marta C.
Silva, Tiago F. da
Sergiienko, Sergii A.
Kovalevski, Andrei V.
dc.subject.por.fl_str_mv Thermoelectric cobaltites
Electrical performance
Composite approach
Transition metals additions
Controlled interactions
topic Thermoelectric cobaltites
Electrical performance
Composite approach
Transition metals additions
Controlled interactions
description This work further explores the possibilities for designing the high-temperature electrical performance of the thermoelectric Ca3Co4O9 phase, by a composite approach involving separate metallic iron and nickel particles additions, and by employing two different sintering schemes, capable to promote the controlled interactions between the components, encouraged by our recent promising results obtained for similar cobalt additions. Iron and nickel were chosen because of their similarities with cobalt. The maximum power factor value of around 200 µWm−1K−2 at 925 K was achieved for the composite with the nominal nickel content of 3% vol., processed via the twostep sintering cycle, which provides the highest densification from this work. The effectiveness of the proposed approach was shown to be strongly dependent on the processing conditions and added amounts of metallic particles. Although the conventional one-step approach results in Feand Ni-containing composites with the major content of the thermoelectric Ca3Co4O9 phase, their electrical performance was found to be significantly lower than for the Co-containing analogue, due to the presence of less-conducting phases and excessive porosity. In contrast, the relatively high performance of the composite with a nominal nickel content of 3% vol. processed via a two-step approach is related to the specific microstructural features from this sample, including minimal porosity and the presence of the Ca2Co2O5 phase, which partially compensate the complete decomposition of the Ca3Co4O9 matrix. The obtained results demonstrate different pathways to tailor the phase composition of Ca3Co4O9 -based materials, with a corresponding impact on the thermoelectric performance, and highlight the necessity of more controllable approaches for the phase composition tuning, including lower amounts and different morphologies of the dispersed metallic phases.
publishDate 2021
dc.date.none.fl_str_mv 2021-03-01T15:45:04Z
2021-02-19T00:00:00Z
2021-02-19
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/10773/30705
url http://hdl.handle.net/10773/30705
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 1996-1944
10.3390/ma14040980
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 MDPI
publisher.none.fl_str_mv MDPI
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
_version_ 1799137682448711680