Structure and oxygen stoichiometry of SrCo0.8Fe0.2O3-d and Ba0.5Sr0.5Co0.8Fe0.2O3-d

Steven McIntosh, Jaap F. Vente, Wim G. Haije, Dave H.A. Blank, Henny J.M. Bouwmeester

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Abstract

High temperature X-ray diffraction (HT-XRD), temperature programmed desorption (TPD), thermogravimetric analysis–differential thermal analysis (TGA/DTA) and neutron diffraction were combined to determine the structure and oxygen stoichiometry of SrCo0.8Fe0.2O3−δ (SCF) and Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) up to 1273 K in the pO2 range of 1 to 10−5 atm. Formation of the vacancy-ordered brownmillerite phase, SrCo0.8Fe0.2O2.5, was observed as a region of zero oxygen release in the TPD measurements and confirmed by HT-XRD and TGA/DTA. No ordering was observed in the BSCF system by any of the techniques utilized in this work. The oxygen vacancy concentration of BSCF was found to be considerably higher than that of SCF and always higher than that of the ordered brownmillerite phase of SCF, δ=0.5. The combination of a high vacancy concentration and absence of ordering leads to higher oxygen permeation fluxes through BSCF membranes in comparison to SCF.
Original languageEnglish
Pages (from-to)1737-1742
Number of pages6
JournalSolid state ionics
Volume177
Issue number19-25
DOIs
Publication statusPublished - 2006

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Stoichiometry
stoichiometry
Temperature programmed desorption
Oxygen
Thermoanalysis
Vacancies
oxygen
X ray diffraction
thermal analysis
desorption
Oxygen vacancies
Neutron diffraction
Permeation
thermal neutrons
diffraction
Fluxes
Membranes
neutron diffraction
Temperature
x rays

Cite this

McIntosh, Steven ; Vente, Jaap F. ; Haije, Wim G. ; Blank, Dave H.A. ; Bouwmeester, Henny J.M. / Structure and oxygen stoichiometry of SrCo0.8Fe0.2O3-d and Ba0.5Sr0.5Co0.8Fe0.2O3-d. In: Solid state ionics. 2006 ; Vol. 177, No. 19-25. pp. 1737-1742.
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title = "Structure and oxygen stoichiometry of SrCo0.8Fe0.2O3-d and Ba0.5Sr0.5Co0.8Fe0.2O3-d",
abstract = "High temperature X-ray diffraction (HT-XRD), temperature programmed desorption (TPD), thermogravimetric analysis–differential thermal analysis (TGA/DTA) and neutron diffraction were combined to determine the structure and oxygen stoichiometry of SrCo0.8Fe0.2O3−δ (SCF) and Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) up to 1273 K in the pO2 range of 1 to 10−5 atm. Formation of the vacancy-ordered brownmillerite phase, SrCo0.8Fe0.2O2.5, was observed as a region of zero oxygen release in the TPD measurements and confirmed by HT-XRD and TGA/DTA. No ordering was observed in the BSCF system by any of the techniques utilized in this work. The oxygen vacancy concentration of BSCF was found to be considerably higher than that of SCF and always higher than that of the ordered brownmillerite phase of SCF, δ=0.5. The combination of a high vacancy concentration and absence of ordering leads to higher oxygen permeation fluxes through BSCF membranes in comparison to SCF.",
author = "Steven McIntosh and Vente, {Jaap F.} and Haije, {Wim G.} and Blank, {Dave H.A.} and Bouwmeester, {Henny J.M.}",
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Structure and oxygen stoichiometry of SrCo0.8Fe0.2O3-d and Ba0.5Sr0.5Co0.8Fe0.2O3-d. / McIntosh, Steven; Vente, Jaap F.; Haije, Wim G.; Blank, Dave H.A.; Bouwmeester, Henny J.M.

In: Solid state ionics, Vol. 177, No. 19-25, 2006, p. 1737-1742.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Structure and oxygen stoichiometry of SrCo0.8Fe0.2O3-d and Ba0.5Sr0.5Co0.8Fe0.2O3-d

AU - McIntosh, Steven

AU - Vente, Jaap F.

AU - Haije, Wim G.

AU - Blank, Dave H.A.

AU - Bouwmeester, Henny J.M.

PY - 2006

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N2 - High temperature X-ray diffraction (HT-XRD), temperature programmed desorption (TPD), thermogravimetric analysis–differential thermal analysis (TGA/DTA) and neutron diffraction were combined to determine the structure and oxygen stoichiometry of SrCo0.8Fe0.2O3−δ (SCF) and Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) up to 1273 K in the pO2 range of 1 to 10−5 atm. Formation of the vacancy-ordered brownmillerite phase, SrCo0.8Fe0.2O2.5, was observed as a region of zero oxygen release in the TPD measurements and confirmed by HT-XRD and TGA/DTA. No ordering was observed in the BSCF system by any of the techniques utilized in this work. The oxygen vacancy concentration of BSCF was found to be considerably higher than that of SCF and always higher than that of the ordered brownmillerite phase of SCF, δ=0.5. The combination of a high vacancy concentration and absence of ordering leads to higher oxygen permeation fluxes through BSCF membranes in comparison to SCF.

AB - High temperature X-ray diffraction (HT-XRD), temperature programmed desorption (TPD), thermogravimetric analysis–differential thermal analysis (TGA/DTA) and neutron diffraction were combined to determine the structure and oxygen stoichiometry of SrCo0.8Fe0.2O3−δ (SCF) and Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) up to 1273 K in the pO2 range of 1 to 10−5 atm. Formation of the vacancy-ordered brownmillerite phase, SrCo0.8Fe0.2O2.5, was observed as a region of zero oxygen release in the TPD measurements and confirmed by HT-XRD and TGA/DTA. No ordering was observed in the BSCF system by any of the techniques utilized in this work. The oxygen vacancy concentration of BSCF was found to be considerably higher than that of SCF and always higher than that of the ordered brownmillerite phase of SCF, δ=0.5. The combination of a high vacancy concentration and absence of ordering leads to higher oxygen permeation fluxes through BSCF membranes in comparison to SCF.

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