Effects of microstructure on surface segregation: Role of grain boundaries

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

    研究成果: Chapter in Book/Report/Conference proceedingConference contribution

    8 被引用数 (Scopus)

    抄録

    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.

    本文言語英語
    ホスト出版物のタイトルIonic and Mixed Conducting Ceramics 10
    編集者X. D. Zhou, M. B. Mogensen, T. M. Gur, T. Kawada, A. Manivannan
    出版社Electrochemical Society Inc.
    ページ57-69
    ページ数13
    7
    ISBN(電子版)9781607685395
    DOI
    出版ステータス出版済み - 2016
    イベントSymposium on Ionic and Mixed Conducting Ceramics 10 - 229th ECS Meeting - San Diego, 米国
    継続期間: 5 29 20166 2 2016

    出版物シリーズ

    名前ECS Transactions
    番号7
    72
    ISSN(印刷版)1938-6737
    ISSN(電子版)1938-5862

    その他

    その他Symposium on Ionic and Mixed Conducting Ceramics 10 - 229th ECS Meeting
    国/地域米国
    CitySan Diego
    Period5/29/166/2/16

    All Science Journal Classification (ASJC) codes

    • 工学(全般)

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