Effects of microstructure on surface segregation: Role of grain boundaries

H. Téllez, J. Druce, T. Ishihara, J. A. Kilner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationIonic and Mixed Conducting Ceramics 10
EditorsX. D. Zhou, M. B. Mogensen, T. M. Gur, T. Kawada, A. Manivannan
PublisherElectrochemical Society Inc.
Pages57-69
Number of pages13
Edition7
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2016
EventSymposium on Ionic and Mixed Conducting Ceramics 10 - 229th ECS Meeting - San Diego, United States
Duration: May 29 2016Jun 2 2016

Publication series

NameECS Transactions
Number7
Volume72
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Other

OtherSymposium on Ionic and Mixed Conducting Ceramics 10 - 229th ECS Meeting
CountryUnited States
CitySan Diego
Period5/29/166/2/16

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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