Strain Effects on the Surface Chemistry of La[subscript 0.7]Sr[subscript 0.3]MnO[subscript 3]
Name
Yildiz_Strain effects.pdf
Size
650.63 KB
Format
Adobe PDF
Checksum (MD5)
53c5d621614b87d1456d72ef51bf41f5
Author(s)
Han, Jeong Woo
Jalili, Helia
Kuru, Yener
Cai, Zhuhua
Yildiz, Bilge
Alternative Title
Strain Effects on the Surface Chemistry of La0.7Sr0.3MnO3
Date Issued
April 2011
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
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.
MIT Department
MIT Materials Research Laboratory
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
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.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1149/1.3570200
