The Orientation Distributions of Lines, Surfaces, and Interfaces around Three-Phase Boundaries in Solid Oxide Fuel Cell Cathodes
Three‐dimensional electron backscatter diffraction was used to measure the crystallographic distribution of the electrochemically relevant triple phase boundary lines and surfaces near them in SOFC cathodes made up of a porous mixture of yttria‐stabilized zirconia and lanthanum strontium manganese o...
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Published in | Journal of the American Ceramic Society Vol. 94; no. 11; pp. 4045 - 4051 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Columbus
Blackwell Publishing Ltd
01.11.2011
Wiley Subscription Services, Inc American Ceramic Society |
Subjects | |
Online Access | Get full text |
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Summary: | Three‐dimensional electron backscatter diffraction was used to measure the crystallographic distribution of the electrochemically relevant triple phase boundary lines and surfaces near them in SOFC cathodes made up of a porous mixture of yttria‐stabilized zirconia and lanthanum strontium manganese oxide, both before and after mild electrochemical loading. All distributions were observed to be nearly isotropic, but non‐random textures above the detection threshold were observed. The distributions differ between the two cells, as do the phase fractions and the electrochemical history. The different distributions are interpreted as evidence that steady‐state distributions vary locally with phase fractions or that they evolve during the initial operation of the fuel cell. The rates at which triple lines, pore surfaces, and interface boundaries in the porous mixture approach a steady‐state value appear to decrease with the average amount of mass transport required to reorient that specific feature. This work provides initial insights into the crystallography of interfaces in a multiphase ceramic material. |
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Bibliography: | ark:/67375/WNG-XVZZLP78-6 ArticleID:JACE4673 istex:BD1A7934BF10E869BAEF1B1F228620016CEBD4A7 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 TPR-3480 FE0004000 The American Ceramic Society |
ISSN: | 0002-7820 1551-2916 |
DOI: | 10.1111/j.1551-2916.2011.04673.x |