Oxygen order-disorder phase transition in layered GdBaCo2O 5+δ perovskite: Thermodynamic and transport properties

Autores
Mogni, Liliana Verónica; Prado, Fernando Daniel; Jimenez, Catalina; Caneiro, Alberto
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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.
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. Centro Científico Tecnológico - CONICET - Bahía Blanca. Instituto de Física del Sur; Argentina. Universidad Nacional del Sur; Argentina
Fil: Jimenez, Catalina. Helmholtz Centre Berlin; Alemania
Fil: Caneiro, Alberto. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
ELECTRON-HOLE TRANSPORT
GDBACO2O5+Δ
LAYERED PEROVSKITES
ORDER-DISORDER
PHASE TRANSITION
THERMODYNAMIC PROPERTIES
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/2067
Acceder
id CONICETDig_5f6e7724e3d19ed5794518bfc46f45f6
oai_identifier_str oai:ri.conicet.gov.ar:11336/2067
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Oxygen order-disorder phase transition in layered GdBaCo2O 5+δ perovskite: Thermodynamic and transport propertiesMogni, Liliana VerónicaPrado, Fernando DanielJimenez, CatalinaCaneiro, AlbertoELECTRON-HOLE TRANSPORTGDBACO2O5+ΔLAYERED PEROVSKITESORDER-DISORDERPHASE TRANSITIONTHERMODYNAMIC PROPERTIEShttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1https://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The 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.Fil: 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. Centro Científico Tecnológico - CONICET - Bahía Blanca. Instituto de Física del Sur; Argentina. Universidad Nacional del Sur; ArgentinaFil: Jimenez, Catalina. Helmholtz Centre Berlin; AlemaniaFil: Caneiro, Alberto. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaElsevier Science2013-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/2067Mogni, 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; 19-280167-2738enginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0167273813001495info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ssi.2013.03.021info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:53:19Zoai:ri.conicet.gov.ar:11336/2067instacron: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:34982025-09-03 09:53:19.516CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Oxygen order-disorder phase transition in layered GdBaCo2O 5+δ perovskite: Thermodynamic and transport properties
title Oxygen order-disorder phase transition in layered GdBaCo2O 5+δ perovskite: Thermodynamic and transport properties
spellingShingle Oxygen order-disorder phase transition in layered GdBaCo2O 5+δ perovskite: Thermodynamic and transport properties
Mogni, Liliana Verónica
ELECTRON-HOLE TRANSPORT
GDBACO2O5+Δ
LAYERED PEROVSKITES
ORDER-DISORDER
PHASE TRANSITION
THERMODYNAMIC PROPERTIES
title_short Oxygen order-disorder phase transition in layered GdBaCo2O 5+δ perovskite: Thermodynamic and transport properties
title_full Oxygen order-disorder phase transition in layered GdBaCo2O 5+δ perovskite: Thermodynamic and transport properties
title_fullStr Oxygen order-disorder phase transition in layered GdBaCo2O 5+δ perovskite: Thermodynamic and transport properties
title_full_unstemmed Oxygen order-disorder phase transition in layered GdBaCo2O 5+δ perovskite: Thermodynamic and transport properties
title_sort Oxygen order-disorder phase transition in layered GdBaCo2O 5+δ perovskite: Thermodynamic and transport properties
dc.creator.none.fl_str_mv Mogni, Liliana Verónica
Prado, Fernando Daniel
Jimenez, Catalina
Caneiro, Alberto
author Mogni, Liliana Verónica
author_facet Mogni, Liliana Verónica
Prado, Fernando Daniel
Jimenez, Catalina
Caneiro, Alberto
author_role author
author2 Prado, Fernando Daniel
Jimenez, Catalina
Caneiro, Alberto
author2_role author
author
author
dc.subject.none.fl_str_mv ELECTRON-HOLE TRANSPORT
GDBACO2O5+Δ
LAYERED PEROVSKITES
ORDER-DISORDER
PHASE TRANSITION
THERMODYNAMIC PROPERTIES
topic ELECTRON-HOLE TRANSPORT
GDBACO2O5+Δ
LAYERED PEROVSKITES
ORDER-DISORDER
PHASE TRANSITION
THERMODYNAMIC PROPERTIES
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv 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.
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. Centro Científico Tecnológico - CONICET - Bahía Blanca. Instituto de Física del Sur; Argentina. Universidad Nacional del Sur; Argentina
Fil: Jimenez, Catalina. Helmholtz Centre Berlin; Alemania
Fil: Caneiro, Alberto. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description 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.
publishDate 2013
dc.date.none.fl_str_mv 2013-06-01
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/11336/2067
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
0167-2738
url http://hdl.handle.net/11336/2067
identifier_str_mv 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
0167-2738
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0167273813001495
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ssi.2013.03.021
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv 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
_version_ 1842269216362725376
score 12.885934

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