Grain boundary character dependence of oxygen grain boundary diffusion in α-Al2O3 bicrystals

Tsubasa Nakagawa, Hitoshi Nishimura, Isao Sakaguchi, Naoya Shibata, Katsuyuki Matsunaga, Takahisa Yamamoto, Yuichi Ikuhara

    Research output: Contribution to journalArticlepeer-review

    24 Citations (Scopus)

    Abstract

    We measured oxygen diffusion coefficients (Dgb) along five grain boundaries (GBs) in alumina bicrystals by tracing 18O by secondary ion mass spectrometry. Although all boundaries are classified as coincident site lattice boundaries with relatively ordered structures, Dgb varied up to 103 times among them. On the other hand, the boundaries with identical boundary planes had relatively similar diffusivities as well as similar structures, regardless of Σ values. These results suggest that Dgb are related to GB atomic structures and hence the GB character, especially GB planes.

    Original languageEnglish
    Pages (from-to)544-547
    Number of pages4
    JournalScripta Materialia
    Volume65
    Issue number6
    DOIs
    Publication statusPublished - 2011 Sep 1

    Keywords

    • Alumina
    • Bicrystal
    • Grain boundary diffusion
    • HREM
    • SIMS

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys

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