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Effects of microstructure on surface segregation: role of grain boundaries

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Title: Effects of microstructure on surface segregation: role of grain boundaries
Authors: Tellez, H
Druce, J
Ishihara, T
Kilner, JA
Item Type: Conference Paper
Abstract: The effects of microstructure on the kinetics of strontium segregation in La0.6Sr0.4CoO3-δ ceramic samples are investigated. A faster segregation of the Sr cations towards the surface was observed after annealing for 1 h at 600 °C in dry oxygen (pO2= 200 mbar) as the density of grain boundaries at the surface increases (i.e. with a decrease of the grain size). The presence of surface impurities, such as Na, partially inhibits the Sr segregation towards the surface. Optical micrographs and ToF-SIMS chemical imaging showed that the segregation and precipitation of Sr starts at the grain boundaries, with an apparent enrichment of the surface around the grain boundary via Sr surface diffusion.
Editors: Mogensen, MB
Kawada, T
Gur, TM
Zhou, XD
Manivannan, A
Issue Date: 29-May-2016
Date of Acceptance: 1-May-2016
URI: http://hdl.handle.net/10044/1/53548
DOI: https://dx.doi.org/10.1149/07207.0057ecst
ISSN: 1938-5862
Publisher: Electrochemical Society
Start Page: 57
End Page: 69
Journal / Book Title: ECS Transactions
Volume: 72
Issue: 7
Copyright Statement: © 2016 ECS - The Electrochemical Society.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/M014142/1
Conference Name: 229th Meeting of The-Electrochemical-Society / Symposium on Ionic and Mixed Conducting Ceramics
Keywords: YTTRIA-STABILIZED ZIRCONIA
OXYGEN-EXCHANGE
THIN-FILMS
LA0.6SR0.4COO3-DELTA
PEROVSKITES
DIFFUSION
KINETICS
Publication Status: Published
Start Date: 2016-05-29
Finish Date: 2016-06-02
Conference Place: San Diego, CA
Appears in Collections:Materials
Faculty of Engineering