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
    Country/TerritoryUnited States
    CitySan Diego
    Period5/29/166/2/16

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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