Oxygen transport in La1-xSrxFe1-yMnyO3-δ perovskites

L. Mikkelsen; I.G.K. Andersen; E.M. Skou

doi:10.1016/S0167-2738(02)00412-5

Oxygen transport in La₁_-_xSr_xFe₁_-_yMn_yO₃_-δ perovskites

L. Mikkelsen, I.G.K. Andersen, E.M. Skou

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

The oxygen transport in La1-xSrxFe1-yMnyO3-delta (LSFM) with 0 less than or equal to x less than or equal to 0.5 and y = 0.2 and 03 has been examined with a thermogravimetric method. As long as x less than or equal to y, the oxygen transport was found to be very slow while the oxygen transport increased several orders of magnitude when x > y. For two compositions-La0.5Sr0.5Fe0.7-Mn0.3O3-delta (1) and La0.6Sr0.4Fe0.8Mn0.2O3-delta (II)-oxygen chemical diffusion coefficients were determined and found to increase from 1.5 x 10(-5) to 5.6 x 10(-5) cm(2) s(-1) for composition (1) and from 1.4 x 10(-6) to 1.4 x 10(-4) cm(2) s(-1) for composition (11) in the temperature range 750-1000 degreesC. The activation energy for the oxygen chemical diffusion was found to be 66 U mol(-1) for La0.5Sr0.5Fe0.7Mn0.3O3-delta and 136 U mol(-1) for La0.6Sr0.4Fe0.8Mn0.2O3-delta. The oxygen surface exchange constants were found to vary between 2.5 x 10(-4) and 1.8 X 10(-2) cm s(-1). (C) 2002 Published by Elsevier Science B.V.

Original language	English
Journal	Solid State Ionics
Volume	152
Pages (from-to)	703-707
ISSN	0167-2738
DOIs	https://doi.org/10.1016/S0167-2738(02)00412-5
Publication status	Published - 2002

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@article{082fe0917e854c59996e263250ae076f,

title = "Oxygen transport in La1-xSrxFe1-yMnyO3-δ perovskites",

abstract = "The oxygen transport in La1-xSrxFe1-yMnyO3-delta (LSFM) with 0 less than or equal to x less than or equal to 0.5 and y = 0.2 and 03 has been examined with a thermogravimetric method. As long as x less than or equal to y, the oxygen transport was found to be very slow while the oxygen transport increased several orders of magnitude when x > y. For two compositions-La0.5Sr0.5Fe0.7-Mn0.3O3-delta (1) and La0.6Sr0.4Fe0.8Mn0.2O3-delta (II)-oxygen chemical diffusion coefficients were determined and found to increase from 1.5 x 10(-5) to 5.6 x 10(-5) cm(2) s(-1) for composition (1) and from 1.4 x 10(-6) to 1.4 x 10(-4) cm(2) s(-1) for composition (11) in the temperature range 750-1000 degreesC. The activation energy for the oxygen chemical diffusion was found to be 66 U mol(-1) for La0.5Sr0.5Fe0.7Mn0.3O3-delta and 136 U mol(-1) for La0.6Sr0.4Fe0.8Mn0.2O3-delta. The oxygen surface exchange constants were found to vary between 2.5 x 10(-4) and 1.8 X 10(-2) cm s(-1). (C) 2002 Published by Elsevier Science B.V. ",

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T1 - Oxygen transport in La1-xSrxFe1-yMnyO3-δ perovskites

AU - Mikkelsen, L.

AU - Andersen, I.G.K.

AU - Skou, E.M.

PY - 2002

Y1 - 2002

N2 - The oxygen transport in La1-xSrxFe1-yMnyO3-delta (LSFM) with 0 less than or equal to x less than or equal to 0.5 and y = 0.2 and 03 has been examined with a thermogravimetric method. As long as x less than or equal to y, the oxygen transport was found to be very slow while the oxygen transport increased several orders of magnitude when x > y. For two compositions-La0.5Sr0.5Fe0.7-Mn0.3O3-delta (1) and La0.6Sr0.4Fe0.8Mn0.2O3-delta (II)-oxygen chemical diffusion coefficients were determined and found to increase from 1.5 x 10(-5) to 5.6 x 10(-5) cm(2) s(-1) for composition (1) and from 1.4 x 10(-6) to 1.4 x 10(-4) cm(2) s(-1) for composition (11) in the temperature range 750-1000 degreesC. The activation energy for the oxygen chemical diffusion was found to be 66 U mol(-1) for La0.5Sr0.5Fe0.7Mn0.3O3-delta and 136 U mol(-1) for La0.6Sr0.4Fe0.8Mn0.2O3-delta. The oxygen surface exchange constants were found to vary between 2.5 x 10(-4) and 1.8 X 10(-2) cm s(-1). (C) 2002 Published by Elsevier Science B.V.

AB - The oxygen transport in La1-xSrxFe1-yMnyO3-delta (LSFM) with 0 less than or equal to x less than or equal to 0.5 and y = 0.2 and 03 has been examined with a thermogravimetric method. As long as x less than or equal to y, the oxygen transport was found to be very slow while the oxygen transport increased several orders of magnitude when x > y. For two compositions-La0.5Sr0.5Fe0.7-Mn0.3O3-delta (1) and La0.6Sr0.4Fe0.8Mn0.2O3-delta (II)-oxygen chemical diffusion coefficients were determined and found to increase from 1.5 x 10(-5) to 5.6 x 10(-5) cm(2) s(-1) for composition (1) and from 1.4 x 10(-6) to 1.4 x 10(-4) cm(2) s(-1) for composition (11) in the temperature range 750-1000 degreesC. The activation energy for the oxygen chemical diffusion was found to be 66 U mol(-1) for La0.5Sr0.5Fe0.7Mn0.3O3-delta and 136 U mol(-1) for La0.6Sr0.4Fe0.8Mn0.2O3-delta. The oxygen surface exchange constants were found to vary between 2.5 x 10(-4) and 1.8 X 10(-2) cm s(-1). (C) 2002 Published by Elsevier Science B.V.

KW - 2-E tekno

U2 - 10.1016/S0167-2738(02)00412-5

DO - 10.1016/S0167-2738(02)00412-5

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VL - 152

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EP - 707

JO - Solid State Ionics

JF - Solid State Ionics