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dc.contributor.author
Mogni, Liliana Verónica
dc.contributor.author
Prado, Fernando Daniel
dc.contributor.author
Jimenez, Catalina
dc.contributor.author
Caneiro, Alberto
dc.date.available
2015-09-23T18:10:18Z
dc.date.issued
2013-06-01
dc.identifier.citation
Mogni, Liliana Verónica; Prado, Fernando Daniel; Jimenez, Catalina; Caneiro, Alberto; Oxygen order-disorder phase transition in layered GdBaCo2O 5+δ perovskite: Thermodynamic and transport properties; Elsevier Science; Solid State Ionics; 240; 1-6-2013; 19-28
dc.identifier.issn
0167-2738
dc.identifier.uri
http://hdl.handle.net/11336/2067
dc.description.abstract
The effects of the orthorhombic (O) to tetragonal (T) phase transition around 450/500 C on the thermodynamic and transport properties of the layered cobaltite GdBaCo2O5+δ have been investigated in detail using complementary techniques such as thermo-gravimetry (TG), differential scanning calorimetry (DSC), dilatometry, angle dispersive as well as energy dispersive high temperature X-ray diffraction (HT-XRD and ED-XRD). Experimental data show that the O/T transition temperature shifts to higher values when the pO2 of the experiment increases. The equilibrium pO2 data shows the presence of a narrow two-phase field around 5 + δ ≈ 5.42. The presence of a two-phase field together with an enthalpy change (â̂†H ≈ 4 J/g) and HT-XRD data showing coexistence of both phases confirms that this phase transition is first-order type. Oxygen partial molar enthalpy and entropy of both phases, the "ordered" O and the "disordered" T, are obtained from TG under controlled pO 2, and yield lower entropy and enthalpy values for the ordered O phase. The O/T phase transition at constant temperature involves a volume contraction and a density change of 0.3%. Isotherms of electrical conductivity as a function of pO2 show that this compound exhibits itinerant charge carrier behavior regardless of the crystal symmetry. The charge carrier mobility decreases for the T phase, which might be due to the shortening of CoOCo distance along a-direction.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
ELECTRON-HOLE TRANSPORT
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GDBACO2O5+Δ
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LAYERED PEROVSKITES
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ORDER-DISORDER
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PHASE TRANSITION
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THERMODYNAMIC PROPERTIES
dc.subject.classification
Física de los Materiales Condensados
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
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Físico-Química, Ciencia de los Polímeros, Electroquímica
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Ciencias Químicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Oxygen order-disorder phase transition in layered GdBaCo2O 5+δ perovskite: Thermodynamic and transport properties
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-03-30 10:35:44.97925-03
dc.journal.volume
240
dc.journal.pagination
19-28
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
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. Centro Científico Tecnológico - CONICET - Bahía Blanca. Instituto de Física del Sur; Argentina. Universidad Nacional del Sur; Argentina
dc.description.fil
Fil: Jimenez, Catalina. Helmholtz Centre Berlin; Alemania
dc.description.fil
Fil: Caneiro, Alberto. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Solid State Ionics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0167273813001495
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.ssi.2013.03.021
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