Effects of microstructure on oxygen transport in perovskite-type oxides

Qinghua Yin; Zhaohui Yang; Jerry Lin

doi:10.1007/s10853-006-0002-2

Effects of microstructure on oxygen transport in perovskite-type oxides

Qinghua Yin, Zhaohui Yang, Jerry Lin

Chemical Engineering

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

La_0.1Sr_0.9Co_0.9Fe_0.1O _3-δ (LSCF) particulates with different microstructures were prepared and oxygen sorption kinetics on these particulates was studied by a gravimetric method. The surface reaction on the crystallite surface is the rate-limiting step for oxygen sorption in loosely packed LSCF powders. In this case the sorption kinetics can be described by a linear driving force model with crystalline size independent sorption and desorption surface reaction rate constants. Oxygen sorption and transport rates are affected by the intercrystalline (grain boundary) resistance for LSCF particulates prepared with a press-sintering step, and in these cases both crystalline and particulate sizes determine the oxygen sorption rates. Sorption rate constant increases when increases the oxygen partial pressure of the atmosphere surrounding the LSCF samples.

Original language	English (US)
Pages (from-to)	4865-4870
Number of pages	6
Journal	Journal of Materials Science
Volume	41
Issue number	15
DOIs	https://doi.org/10.1007/s10853-006-0002-2
State	Published - Aug 2006

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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10.1007/s10853-006-0002-2

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title = "Effects of microstructure on oxygen transport in perovskite-type oxides",

abstract = "La0.1Sr0.9Co0.9Fe0.1O 3-δ (LSCF) particulates with different microstructures were prepared and oxygen sorption kinetics on these particulates was studied by a gravimetric method. The surface reaction on the crystallite surface is the rate-limiting step for oxygen sorption in loosely packed LSCF powders. In this case the sorption kinetics can be described by a linear driving force model with crystalline size independent sorption and desorption surface reaction rate constants. Oxygen sorption and transport rates are affected by the intercrystalline (grain boundary) resistance for LSCF particulates prepared with a press-sintering step, and in these cases both crystalline and particulate sizes determine the oxygen sorption rates. Sorption rate constant increases when increases the oxygen partial pressure of the atmosphere surrounding the LSCF samples.",

author = "Qinghua Yin and Zhaohui Yang and Jerry Lin",

note = "Funding Information: Acknowledgements The authors acknowledge the support of the NSF (CTS-0132694) on this project.",

year = "2006",

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doi = "10.1007/s10853-006-0002-2",

language = "English (US)",

volume = "41",

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journal = "Journal of Materials Science",

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TY - JOUR

T1 - Effects of microstructure on oxygen transport in perovskite-type oxides

AU - Yin, Qinghua

AU - Yang, Zhaohui

AU - Lin, Jerry

N1 - Funding Information: Acknowledgements The authors acknowledge the support of the NSF (CTS-0132694) on this project.

PY - 2006/8

Y1 - 2006/8

N2 - La0.1Sr0.9Co0.9Fe0.1O 3-δ (LSCF) particulates with different microstructures were prepared and oxygen sorption kinetics on these particulates was studied by a gravimetric method. The surface reaction on the crystallite surface is the rate-limiting step for oxygen sorption in loosely packed LSCF powders. In this case the sorption kinetics can be described by a linear driving force model with crystalline size independent sorption and desorption surface reaction rate constants. Oxygen sorption and transport rates are affected by the intercrystalline (grain boundary) resistance for LSCF particulates prepared with a press-sintering step, and in these cases both crystalline and particulate sizes determine the oxygen sorption rates. Sorption rate constant increases when increases the oxygen partial pressure of the atmosphere surrounding the LSCF samples.

AB - La0.1Sr0.9Co0.9Fe0.1O 3-δ (LSCF) particulates with different microstructures were prepared and oxygen sorption kinetics on these particulates was studied by a gravimetric method. The surface reaction on the crystallite surface is the rate-limiting step for oxygen sorption in loosely packed LSCF powders. In this case the sorption kinetics can be described by a linear driving force model with crystalline size independent sorption and desorption surface reaction rate constants. Oxygen sorption and transport rates are affected by the intercrystalline (grain boundary) resistance for LSCF particulates prepared with a press-sintering step, and in these cases both crystalline and particulate sizes determine the oxygen sorption rates. Sorption rate constant increases when increases the oxygen partial pressure of the atmosphere surrounding the LSCF samples.

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JO - Journal of Materials Science

JF - Journal of Materials Science

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ER -

Effects of microstructure on oxygen transport in perovskite-type oxides

Abstract

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