Localized strain and atomic structures of symmetrical tilt grain boundaries in Al2O3 bicrystals

Tomohiro Saito, Tsukasa Hirayama, Katsuyuki Matsunaga, Takahisa Yamamoto, Yuichi Ikuhara

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Residual strain and atomic structures in the vicinity of the grain boundaries were investigated for (23̄10) [0001] ∑21, (45̄10) [0001]∑7 and (011̄2) [2̄110]R∑7 symmetrical tilt grain boundaries of Al2O3 bicrystals using convergent beam electron diffraction (CBED) and high-resolution electron microscopy (HRTEM). CBED measurement clearly showed that the R∑7 grain boundary has a relatively small strain across the boundary. On the other hand, there is strain of about 0.06-0.07% in the area 10 nm from the grain boundaries in both the ∑21 and ∑7 grain boundaries. It was found that signs of strain distribution in the vicinity of the grain boundary observed in the ∑21 specimen were opposite to those observed in the ∑7 specimen. The interplanar distances of (2̄110) a-plane and (0001) c-plane in the ∑21 boundary were confirmed to increase and decrease, respectively, in the vicinity of the grain boundary. In contrast, the respective interplanar distances in the ∑7 boundary decrease and increase, respectively. The difference in the change of interplanar distance observed in the ∑21 and ∑7 boundaries is considered to be closely related to the atomic density at the respective grain boundaries.

    Original languageEnglish
    Pages (from-to)605-610
    Number of pages6
    JournalJournal of the Ceramic Society of Japan
    Volume113
    Issue number1321
    DOIs
    Publication statusPublished - 2005 Sep

    Keywords

    • Atomic density
    • Bicrystal
    • CBED
    • Grain boundary
    • HRTEM
    • Strain

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Chemistry(all)
    • Condensed Matter Physics
    • Materials Chemistry

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