Effects of microstructure on surface segregation: role of grain boundaries
File(s)Tellez ECST 2016.doc (1.3 MB)
Accepted version
Author(s)
Tellez, H
Druce, J
Ishihara, T
Kilner, JA
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.
Editor(s)
Mogensen, MB
Kawada, T
Gur, TM
Zhou, XD
Manivannan, A
Date Issued
2016-05-29
Date Acceptance
2016-05-01
Citation
ECS Transactions, 2016, 72 (7), pp.57-69
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
Engineering & Physical Science Research Council (EPSRC)
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000403795400006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
EP/M014142/1
Source
229th Meeting of The-Electrochemical-Society / Symposium on Ionic and Mixed Conducting Ceramics
Subjects
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
Coverage Spatial
San Diego, CA