Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ

Autores
Grunbaum, Nicolas; Mogni, Liliana Verónica; Prado, Fernando Daniel; Caneiro, Alberto
Año de publicación
2004
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The phase diagram of the SrCo0.8Fe0.2O 3-δ compound has been determined at high temperatures (823≤T≤1223K) and in the oxygen partial pressure range (10 -5≤pO2≤1atm) by thermogravimetric measurements of the equilibrium pO2, high temperature X-ray diffraction and electrical conductivity measurements. The cubic perovskite phase SrCo 0.8Fe0.2O3-δ is stable in a broad range of oxygen content, while the orthorhombic brownmillerite phase SrCo 0.8Fe0.2O2.5 stabilizes within a small range around 3-δ=2.5 at temperatures below 1073K. Equilibrium pO2 measurements under isothermal conditions show chemical hysteresis at the perovskite to brownmillerite transition. The hysteresis loop decreases its amplitude in pO2 with decreasing temperature. This behavior is discussed considering the evolution from coherent intergrowth interfaces with elastic strain energy to incoherent interfaces without elastic strain energy as T decreases. The thermodynamic quantities hO2oxide and sO2oxide for the perovskite phase decrease when increasing the oxygen defects concentration. The electrical conductivity (σ) of the cubic phase exhibits a thermally activated behavior at high temperature. The variation of σ with the oxygen content is non-linear and the activation energy varies from 0.4 to 0.28eV as the oxygen content increases from 2.4 to 2.6. These results are interpreted in the frame of the small polaron model. © 2004 Elsevier Inc. All rights reserved.
Fil: Grunbaum, Nicolas. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Fil: Mogni, Liliana Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Fil: Prado, Fernando Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Fil: Caneiro, Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Materia
72.60
Electrical Transport
Mixed Conductors
Phase Diagram
Strontium Iron Cobalt Oxide
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/72546
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/72546
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δGrunbaum, NicolasMogni, Liliana VerónicaPrado, Fernando DanielCaneiro, Alberto72.60Electrical TransportMixed ConductorsPhase DiagramStrontium Iron Cobalt Oxidehttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The phase diagram of the SrCo0.8Fe0.2O 3-δ compound has been determined at high temperatures (823≤T≤1223K) and in the oxygen partial pressure range (10 -5≤pO2≤1atm) by thermogravimetric measurements of the equilibrium pO2, high temperature X-ray diffraction and electrical conductivity measurements. The cubic perovskite phase SrCo 0.8Fe0.2O3-δ is stable in a broad range of oxygen content, while the orthorhombic brownmillerite phase SrCo 0.8Fe0.2O2.5 stabilizes within a small range around 3-δ=2.5 at temperatures below 1073K. Equilibrium pO2 measurements under isothermal conditions show chemical hysteresis at the perovskite to brownmillerite transition. The hysteresis loop decreases its amplitude in pO2 with decreasing temperature. This behavior is discussed considering the evolution from coherent intergrowth interfaces with elastic strain energy to incoherent interfaces without elastic strain energy as T decreases. The thermodynamic quantities hO2oxide and sO2oxide for the perovskite phase decrease when increasing the oxygen defects concentration. The electrical conductivity (σ) of the cubic phase exhibits a thermally activated behavior at high temperature. The variation of σ with the oxygen content is non-linear and the activation energy varies from 0.4 to 0.28eV as the oxygen content increases from 2.4 to 2.6. These results are interpreted in the frame of the small polaron model. © 2004 Elsevier Inc. All rights reserved.Fil: Grunbaum, Nicolas. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; ArgentinaFil: Mogni, Liliana Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; ArgentinaFil: Prado, Fernando Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; ArgentinaFil: Caneiro, Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; ArgentinaAcademic Press Inc Elsevier Science2004-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/72546Grunbaum, Nicolas; Mogni, Liliana Verónica; Prado, Fernando Daniel; Caneiro, Alberto; Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ; Academic Press Inc Elsevier Science; Journal of Solid State Chemistry; 177; 7; 7-2004; 2350-23570022-4596CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.jssc.2004.03.026info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0022459604001379info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T12:03:23Zoai:ri.conicet.gov.ar:11336/72546instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 12:03:23.51CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ
title Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ
spellingShingle Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ
Grunbaum, Nicolas
72.60
Electrical Transport
Mixed Conductors
Phase Diagram
Strontium Iron Cobalt Oxide
title_short Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ
title_full Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ
title_fullStr Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ
title_full_unstemmed Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ
title_sort Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ
dc.creator.none.fl_str_mv Grunbaum, Nicolas
Mogni, Liliana Verónica
Prado, Fernando Daniel
Caneiro, Alberto
author Grunbaum, Nicolas
author_facet Grunbaum, Nicolas
Mogni, Liliana Verónica
Prado, Fernando Daniel
Caneiro, Alberto
author_role author
author2 Mogni, Liliana Verónica
Prado, Fernando Daniel
Caneiro, Alberto
author2_role author
author
author
dc.subject.none.fl_str_mv 72.60
Electrical Transport
Mixed Conductors
Phase Diagram
Strontium Iron Cobalt Oxide
topic 72.60
Electrical Transport
Mixed Conductors
Phase Diagram
Strontium Iron Cobalt Oxide
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The phase diagram of the SrCo0.8Fe0.2O 3-δ compound has been determined at high temperatures (823≤T≤1223K) and in the oxygen partial pressure range (10 -5≤pO2≤1atm) by thermogravimetric measurements of the equilibrium pO2, high temperature X-ray diffraction and electrical conductivity measurements. The cubic perovskite phase SrCo 0.8Fe0.2O3-δ is stable in a broad range of oxygen content, while the orthorhombic brownmillerite phase SrCo 0.8Fe0.2O2.5 stabilizes within a small range around 3-δ=2.5 at temperatures below 1073K. Equilibrium pO2 measurements under isothermal conditions show chemical hysteresis at the perovskite to brownmillerite transition. The hysteresis loop decreases its amplitude in pO2 with decreasing temperature. This behavior is discussed considering the evolution from coherent intergrowth interfaces with elastic strain energy to incoherent interfaces without elastic strain energy as T decreases. The thermodynamic quantities hO2oxide and sO2oxide for the perovskite phase decrease when increasing the oxygen defects concentration. The electrical conductivity (σ) of the cubic phase exhibits a thermally activated behavior at high temperature. The variation of σ with the oxygen content is non-linear and the activation energy varies from 0.4 to 0.28eV as the oxygen content increases from 2.4 to 2.6. These results are interpreted in the frame of the small polaron model. © 2004 Elsevier Inc. All rights reserved.
Fil: Grunbaum, Nicolas. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Fil: Mogni, Liliana Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Fil: Prado, Fernando Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Fil: Caneiro, Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
description The phase diagram of the SrCo0.8Fe0.2O 3-δ compound has been determined at high temperatures (823≤T≤1223K) and in the oxygen partial pressure range (10 -5≤pO2≤1atm) by thermogravimetric measurements of the equilibrium pO2, high temperature X-ray diffraction and electrical conductivity measurements. The cubic perovskite phase SrCo 0.8Fe0.2O3-δ is stable in a broad range of oxygen content, while the orthorhombic brownmillerite phase SrCo 0.8Fe0.2O2.5 stabilizes within a small range around 3-δ=2.5 at temperatures below 1073K. Equilibrium pO2 measurements under isothermal conditions show chemical hysteresis at the perovskite to brownmillerite transition. The hysteresis loop decreases its amplitude in pO2 with decreasing temperature. This behavior is discussed considering the evolution from coherent intergrowth interfaces with elastic strain energy to incoherent interfaces without elastic strain energy as T decreases. The thermodynamic quantities hO2oxide and sO2oxide for the perovskite phase decrease when increasing the oxygen defects concentration. The electrical conductivity (σ) of the cubic phase exhibits a thermally activated behavior at high temperature. The variation of σ with the oxygen content is non-linear and the activation energy varies from 0.4 to 0.28eV as the oxygen content increases from 2.4 to 2.6. These results are interpreted in the frame of the small polaron model. © 2004 Elsevier Inc. All rights reserved.
publishDate 2004
dc.date.none.fl_str_mv 2004-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/72546
Grunbaum, Nicolas; Mogni, Liliana Verónica; Prado, Fernando Daniel; Caneiro, Alberto; Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ; Academic Press Inc Elsevier Science; Journal of Solid State Chemistry; 177; 7; 7-2004; 2350-2357
0022-4596
CONICET Digital
CONICET
url http://hdl.handle.net/11336/72546
identifier_str_mv Grunbaum, Nicolas; Mogni, Liliana Verónica; Prado, Fernando Daniel; Caneiro, Alberto; Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ; Academic Press Inc Elsevier Science; Journal of Solid State Chemistry; 177; 7; 7-2004; 2350-2357
0022-4596
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jssc.2004.03.026
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0022459604001379
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Academic Press Inc Elsevier Science
publisher.none.fl_str_mv Academic Press Inc Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.982451

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