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Strain Effects on the Surface Chemistry of La[subscript 0.7]Sr[subscript 0.3]MnO[subscript 3]

Author(s)
Han, Jeong Woo; Jalili, Helia; Kuru, Yener; Cai, Zhuhua; Yildiz, Bilge
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Alternative title
Strain Effects on the Surface Chemistry of La0.7Sr0.3MnO3
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
We report on the mechanistic effects of epitaxial strain on the surface chemistry, in particular the segregation of Sr cations on La0.7Sr0.3MnO3 (LSM) model dense thin films. Our results show that the LSM film surfaces are layered and exhibit strain-dependent nanoscale lateral structures. All surfaces examined here were Sr-rich. X-ray photoelectron spectroscopy shows a larger Sr segregation tendency for the tensile strained LSM films. This result is in good agreement with our first principles-based calculations, which predict lower Sr segregation energy on the tensile strained LSM surface. Our findings suggest the importance of lattice strain as a key parameter to tune the surface chemistry for facilitating oxygen reduction kinetics on transition metal perovskite cathode surfaces for solid oxide fuel cells.
Date issued
2011-04
URI
http://hdl.handle.net/1721.1/81420
Department
Massachusetts Institute of Technology. Materials Processing Center; Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Laboratory for Electrochemical Interfaces; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
ECS Transactions
Publisher
Electrochemical Society
Citation
Han, Jeong Woo, Helia Jalili, Yener Kuru, Zhuhua Cai, and Bilge Yildiz. “Strain Effects on the Surface Chemistry of La0.7Sr0.3MnO3.” ECS Transactions, 35 (1). pp.2097-2104. © The Electrochemical Society, 2011.
Version: Final published version
ISSN
1938-5862
1938-6737

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