Surface oxygen exchange of La0.3Sr0.7CoO3-d

René H.E. van Doorn; Ian C. Fullarton; Roger A. de Souza; John A. Kilner; Henny J.M. Bouwmeester; Anthonie J. Burggraaf

doi:10.1016/S0167-2738(97)00011-8

Surface oxygen exchange of La0.3Sr0.7CoO3-d

René H.E. van Doorn, Ian C. Fullarton, Roger A. de Souza, John A. Kilner, Henny J.M. Bouwmeester, Anthonie J. Burggraaf

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Abstract

The surface oxygen exchange of La0.3Sr0.7CoO3 − δ has been studied by 18O/16O exchange followed by dynamic SIMS analysis in the temperature region 700–;900 °C at a pO2 of 2.1 × 104 Pa. The activation energy for the surface exchange rate (k) is 28 ± 5 kJ mol−1 and for the oxygen tracer diffusion coefficient (D*) 56 ± 4 kJ mol−1. The absolute values for both k and D* are among the highest known in the literature. The characteristic thickness at a pO2 of 2.1 × 104 Pa is calculated to lie in the range 0.70 to 1.3 mm and is a function of temperature. The latter reflects the different activation energies for k and D*. The surface oxygen exchange coefficient is proportional to PO2n with N = 0.41 ± 0.02 at 800 °C, which has been explained by a rate determining step involving an adsorbed oxygen species and an oxygen vacancy. No oxygen pressure dependence for the tracer diffusion coefficient was observed at this temperature.

Original language	English
Pages (from-to)	1-7
Number of pages	7
Journal	Solid state ionics
Volume	96
Issue number	1-2
DOIs	https://doi.org/10.1016/S0167-2738(97)00011-8
Publication status	Published - 1997

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@article{843f36a4372a4df38428dd41399fb293,

title = "Surface oxygen exchange of La0.3Sr0.7CoO3-d",

abstract = "The surface oxygen exchange of La0.3Sr0.7CoO3 − δ has been studied by 18O/16O exchange followed by dynamic SIMS analysis in the temperature region 700–;900 °C at a pO2 of 2.1 × 104 Pa. The activation energy for the surface exchange rate (k) is 28 ± 5 kJ mol−1 and for the oxygen tracer diffusion coefficient (D*) 56 ± 4 kJ mol−1. The absolute values for both k and D* are among the highest known in the literature. The characteristic thickness at a pO2 of 2.1 × 104 Pa is calculated to lie in the range 0.70 to 1.3 mm and is a function of temperature. The latter reflects the different activation energies for k and D*. The surface oxygen exchange coefficient is proportional to PO2n with N = 0.41 ± 0.02 at 800 °C, which has been explained by a rate determining step involving an adsorbed oxygen species and an oxygen vacancy. No oxygen pressure dependence for the tracer diffusion coefficient was observed at this temperature.",

author = "{van Doorn}, {Ren{\'e} H.E.} and Fullarton, {Ian C.} and {de Souza}, {Roger A.} and Kilner, {John A.} and Bouwmeester, {Henny J.M.} and Burggraaf, {Anthonie J.}",

year = "1997",

doi = "10.1016/S0167-2738(97)00011-8",

language = "English",

volume = "96",

pages = "1--7",

journal = "Solid state ionics",

issn = "0167-2738",

publisher = "Elsevier B.V.",

number = "1-2",

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TY - JOUR

T1 - Surface oxygen exchange of La0.3Sr0.7CoO3-d

AU - van Doorn, René H.E.

AU - Fullarton, Ian C.

AU - de Souza, Roger A.

AU - Kilner, John A.

AU - Bouwmeester, Henny J.M.

AU - Burggraaf, Anthonie J.

PY - 1997

Y1 - 1997

N2 - The surface oxygen exchange of La0.3Sr0.7CoO3 − δ has been studied by 18O/16O exchange followed by dynamic SIMS analysis in the temperature region 700–;900 °C at a pO2 of 2.1 × 104 Pa. The activation energy for the surface exchange rate (k) is 28 ± 5 kJ mol−1 and for the oxygen tracer diffusion coefficient (D*) 56 ± 4 kJ mol−1. The absolute values for both k and D* are among the highest known in the literature. The characteristic thickness at a pO2 of 2.1 × 104 Pa is calculated to lie in the range 0.70 to 1.3 mm and is a function of temperature. The latter reflects the different activation energies for k and D*. The surface oxygen exchange coefficient is proportional to PO2n with N = 0.41 ± 0.02 at 800 °C, which has been explained by a rate determining step involving an adsorbed oxygen species and an oxygen vacancy. No oxygen pressure dependence for the tracer diffusion coefficient was observed at this temperature.

AB - The surface oxygen exchange of La0.3Sr0.7CoO3 − δ has been studied by 18O/16O exchange followed by dynamic SIMS analysis in the temperature region 700–;900 °C at a pO2 of 2.1 × 104 Pa. The activation energy for the surface exchange rate (k) is 28 ± 5 kJ mol−1 and for the oxygen tracer diffusion coefficient (D*) 56 ± 4 kJ mol−1. The absolute values for both k and D* are among the highest known in the literature. The characteristic thickness at a pO2 of 2.1 × 104 Pa is calculated to lie in the range 0.70 to 1.3 mm and is a function of temperature. The latter reflects the different activation energies for k and D*. The surface oxygen exchange coefficient is proportional to PO2n with N = 0.41 ± 0.02 at 800 °C, which has been explained by a rate determining step involving an adsorbed oxygen species and an oxygen vacancy. No oxygen pressure dependence for the tracer diffusion coefficient was observed at this temperature.

U2 - 10.1016/S0167-2738(97)00011-8

DO - 10.1016/S0167-2738(97)00011-8

M3 - Article

SN - 0167-2738

VL - 96

SP - 1

EP - 7

JO - Solid state ionics

JF - Solid state ionics

IS - 1-2

ER -

Surface oxygen exchange of La0.3Sr0.7CoO3-d

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