Reactive sintering of yttrium-doped barium zirconate (BaZr0.8Y0.2O3-δ) without sintering aids

Detalhes bibliográficos
Autor(a) principal: Goulart, Celso Antonio
Data de Publicação: 2021
Outros Autores: Villas-Boas, Lúcia Adriana [UNESP], Morelli, Márcio Raymundo, Souza, Dulcina Pinatti Ferreira de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.ceramint.2020.09.102
http://hdl.handle.net/11449/205225
Resumo: The effects of Yttrium-doped Barium Zirconate (BZY) synthesis steps by solid-state reaction and the number of starting reactants (2 or 3) on the characteristics of the synthesized ceramic powders were investigated. The slow diffusion rate associated with this synthesis route and the calcination steps used in this work lead to an incomplete synthesis reaction. This condition proved to be useful to improve densification during sintering for undoped samples by emulating the reactive sintering technique with transient reactions originating from the residual BaCO3 reactant. The effects of a low concentration (1 mol%) of ZnO as sintering aid on microstructure and electrical conductivity were also investigated and used for comparison to undoped samples. Electrical properties were analyzed and correlated with microstructural and compositional characteristics. Dense undoped BZY samples (99% of relative density) with high proton conductivity (2.4×10−2S/cm at 600 °C) were obtained by sintering at 1500 °C, while ZnO-doped samples achieved high relative density (97%) at only 1300 °C, but with lower electrical conductivity (7.8×10−3 S/cm at 600 °C).
id UNSP_54e7100f2a1291ebbdcc5e11cc38afb8
oai_identifier_str oai:repositorio.unesp.br:11449/205225
network_acronym_str UNSP
network_name_str Repositório Institucional da UNESP
repository_id_str 2946
spelling Reactive sintering of yttrium-doped barium zirconate (BaZr0.8Y0.2O3-δ) without sintering aidsCeramic processingPCFCProtonic conductivitySolid-state reactionYttrium-doped barium zirconateThe effects of Yttrium-doped Barium Zirconate (BZY) synthesis steps by solid-state reaction and the number of starting reactants (2 or 3) on the characteristics of the synthesized ceramic powders were investigated. The slow diffusion rate associated with this synthesis route and the calcination steps used in this work lead to an incomplete synthesis reaction. This condition proved to be useful to improve densification during sintering for undoped samples by emulating the reactive sintering technique with transient reactions originating from the residual BaCO3 reactant. The effects of a low concentration (1 mol%) of ZnO as sintering aid on microstructure and electrical conductivity were also investigated and used for comparison to undoped samples. Electrical properties were analyzed and correlated with microstructural and compositional characteristics. Dense undoped BZY samples (99% of relative density) with high proton conductivity (2.4×10−2S/cm at 600 °C) were obtained by sintering at 1500 °C, while ZnO-doped samples achieved high relative density (97%) at only 1300 °C, but with lower electrical conductivity (7.8×10−3 S/cm at 600 °C).Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Graduate Program in Materials Science and Engineering Department of Materials Engineering Federal University of São Carlos (UFSCar)São Paulo State University (UNESP) School of Sciences and EngineeringSão Paulo State University (UNESP) School of Sciences and EngineeringCAPES: 001CAPES: 88882.332711/2019–01Universidade Federal de São Carlos (UFSCar)Universidade Estadual Paulista (Unesp)Goulart, Celso AntonioVillas-Boas, Lúcia Adriana [UNESP]Morelli, Márcio RaymundoSouza, Dulcina Pinatti Ferreira de2021-06-25T10:11:57Z2021-06-25T10:11:57Z2021-01-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article2565-2571http://dx.doi.org/10.1016/j.ceramint.2020.09.102Ceramics International, v. 47, n. 2, p. 2565-2571, 2021.0272-8842http://hdl.handle.net/11449/20522510.1016/j.ceramint.2020.09.1022-s2.0-85091612340Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengCeramics Internationalinfo:eu-repo/semantics/openAccess2021-10-23T12:19:07Zoai:repositorio.unesp.br:11449/205225Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-06T00:06:45.662927Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Reactive sintering of yttrium-doped barium zirconate (BaZr0.8Y0.2O3-δ) without sintering aids
title Reactive sintering of yttrium-doped barium zirconate (BaZr0.8Y0.2O3-δ) without sintering aids
spellingShingle Reactive sintering of yttrium-doped barium zirconate (BaZr0.8Y0.2O3-δ) without sintering aids
Goulart, Celso Antonio
Ceramic processing
PCFC
Protonic conductivity
Solid-state reaction
Yttrium-doped barium zirconate
title_short Reactive sintering of yttrium-doped barium zirconate (BaZr0.8Y0.2O3-δ) without sintering aids
title_full Reactive sintering of yttrium-doped barium zirconate (BaZr0.8Y0.2O3-δ) without sintering aids
title_fullStr Reactive sintering of yttrium-doped barium zirconate (BaZr0.8Y0.2O3-δ) without sintering aids
title_full_unstemmed Reactive sintering of yttrium-doped barium zirconate (BaZr0.8Y0.2O3-δ) without sintering aids
title_sort Reactive sintering of yttrium-doped barium zirconate (BaZr0.8Y0.2O3-δ) without sintering aids
author Goulart, Celso Antonio
author_facet Goulart, Celso Antonio
Villas-Boas, Lúcia Adriana [UNESP]
Morelli, Márcio Raymundo
Souza, Dulcina Pinatti Ferreira de
author_role author
author2 Villas-Boas, Lúcia Adriana [UNESP]
Morelli, Márcio Raymundo
Souza, Dulcina Pinatti Ferreira de
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade Federal de São Carlos (UFSCar)
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Goulart, Celso Antonio
Villas-Boas, Lúcia Adriana [UNESP]
Morelli, Márcio Raymundo
Souza, Dulcina Pinatti Ferreira de
dc.subject.por.fl_str_mv Ceramic processing
PCFC
Protonic conductivity
Solid-state reaction
Yttrium-doped barium zirconate
topic Ceramic processing
PCFC
Protonic conductivity
Solid-state reaction
Yttrium-doped barium zirconate
description The effects of Yttrium-doped Barium Zirconate (BZY) synthesis steps by solid-state reaction and the number of starting reactants (2 or 3) on the characteristics of the synthesized ceramic powders were investigated. The slow diffusion rate associated with this synthesis route and the calcination steps used in this work lead to an incomplete synthesis reaction. This condition proved to be useful to improve densification during sintering for undoped samples by emulating the reactive sintering technique with transient reactions originating from the residual BaCO3 reactant. The effects of a low concentration (1 mol%) of ZnO as sintering aid on microstructure and electrical conductivity were also investigated and used for comparison to undoped samples. Electrical properties were analyzed and correlated with microstructural and compositional characteristics. Dense undoped BZY samples (99% of relative density) with high proton conductivity (2.4×10−2S/cm at 600 °C) were obtained by sintering at 1500 °C, while ZnO-doped samples achieved high relative density (97%) at only 1300 °C, but with lower electrical conductivity (7.8×10−3 S/cm at 600 °C).
publishDate 2021
dc.date.none.fl_str_mv 2021-06-25T10:11:57Z
2021-06-25T10:11:57Z
2021-01-15
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://dx.doi.org/10.1016/j.ceramint.2020.09.102
Ceramics International, v. 47, n. 2, p. 2565-2571, 2021.
0272-8842
http://hdl.handle.net/11449/205225
10.1016/j.ceramint.2020.09.102
2-s2.0-85091612340
url http://dx.doi.org/10.1016/j.ceramint.2020.09.102
http://hdl.handle.net/11449/205225
identifier_str_mv Ceramics International, v. 47, n. 2, p. 2565-2571, 2021.
0272-8842
10.1016/j.ceramint.2020.09.102
2-s2.0-85091612340
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Ceramics International
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 2565-2571
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
_version_ 1808129584450764800