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dc.contributor.author
Grunbaum, Nicolas
dc.contributor.author
Mogni, Liliana Verónica
dc.contributor.author
Prado, Fernando Daniel
dc.contributor.author
Caneiro, Alberto
dc.date.available
2019-03-26T16:02:41Z
dc.date.issued
2004-07
dc.identifier.citation
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
dc.identifier.issn
0022-4596
dc.identifier.uri
http://hdl.handle.net/11336/72546
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Academic Press Inc Elsevier Science
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
72.60
dc.subject
Electrical Transport
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Mixed Conductors
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Phase Diagram
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Strontium Iron Cobalt Oxide
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Otras Ciencias Químicas
dc.subject.classification
Ciencias Químicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Phase equilibrium and electrical conductivity of SrCo0.8Fe 0.2O3-δ
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-03-15T19:23:07Z
dc.journal.volume
177
dc.journal.number
7
dc.journal.pagination
2350-2357
dc.journal.pais
Estados Unidos
dc.journal.ciudad
San Diego
dc.description.fil
Fil: Grunbaum, Nicolas. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
dc.description.fil
Fil: Mogni, Liliana Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
dc.description.fil
Fil: Prado, Fernando Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
dc.description.fil
Fil: Caneiro, Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
dc.journal.title
Journal of Solid State Chemistry
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1016/j.jssc.2004.03.026
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0022459604001379
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