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Electrical Conductivity Relaxation Study of Solid Oxide Fuel Cell Cathodes using Epitaxial (001)-Oriented Strontium-Doped Lanthanum Manganite Thin Films

Published online by Cambridge University Press:  01 February 2011

Lu Yan ,
Balasubramaniam Kavaipatti ,
Shanling Wang ,
Hui Du  and
Paul Salvador
Lu Yan
Affiliation:
luyan@andrew.cmu.edu, Carnegie Mellon University, Materials Sci and Eng, Pittsburgh, Pennsylvania, United States
Balasubramaniam Kavaipatti
Affiliation:
bk@andrew.cmu.edu, Carnegie Mellon University, Materials Sci and Eng, Pittsburgh, Pennsylvania, United States
Shanling Wang
Affiliation:
shanling@andrew.cmu.edu, Carnegie Mellon University, Materials Sci and Eng, Pittsburgh, Pennsylvania, United States
Hui Du
Affiliation:
hdu@andrew.cmu.edu, Carnegie Mellon University, Materials Sci and Eng, Pittsburgh, Pennsylvania, United States
Paul Salvador
Affiliation:
paul7@andrew.cmu.edu, Carnegie Mellon University, Materials Sci and Eng, Pittsburgh, Pennsylvania, United States
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Abstract

Epitaxial single-crystal films of La0.7Sr0.3MnO3 (100) having smooth surface morphology were deposited on SrTiO3 (100) substrates by pulsed laser deposition (PLD). Electrical conductivity relaxation (ECR) measurements were carried out at elevated temperatures over a range of absolute oxygen pressures to determine the oxygen surface exchange coefficient. Steady-state conductivity data of the thin films show good agreement with the bulk material's properties. The values of the oxygen exchange coefficients (Kchem) are found to be similar for both oxidation and reduction process between 50 and 500 mTorr O2. The activation energy (Ea) of Kchem is 1.00±0.27 eV at temperatures above 600 °C and Kchem (T=612°C)≈1.2×10-6 cm/s.

Keywords

catalyticsurface reactionthin film
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1255: Symposium M – Structure-Function Relations at Perovskite Surfaces and Interfaces , 2010 , 1255-M02-02
Copyright
Copyright © Materials Research Society 2010

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