Current-voltage characteristics across small angle symmetric tilt boundaries in Nb-doped SrTio3 bicrystals

Takahisa Yamamoto, Fumiyasu Oba, Yuichi Ikuhara, Taketo Sakuma

    研究成果: Article査読

    9 被引用数 (Scopus)

    抄録

    Grain boundary structure and current-voltage (I-V) characteristics were investigated for Nb-doped SrTiO3 bicrystals having small angle tilt boundaries with misorientation angles of 2° and 4° against [001]. The bicrystals were fabricated by using hot-joining technique at 1400°C for 10 h under a pressure of 0.4 MPa. High resolution transmission electron microscopy study revealed that the joined boundaries are free from any secondary phases such as amorphous phases even on an atomic scale. The structures of the two boundaries are composed of edge type dislocations whose Burgers vector is [010]. But the density of boundary dislocations differs between the two boundaries. They exist at an interval of 10 nm in the 2°-boundary and 5.2 nm in the 4°-boundary. On the other hand, it was found that non-linearity in I-V relation across the boundary increases with an increase in the misorientation angle. This result clearly indicates that the potential barrier height is closely related to the density of boundary dislocations in the case of small angle type boundaries.

    本文言語English
    ページ(範囲)1537-1541
    ページ数5
    ジャーナルMaterials Transactions
    43
    7
    DOI
    出版ステータスPublished - 2002 7月

    ASJC Scopus subject areas

    • 材料科学(全般)
    • 凝縮系物理学
    • 材料力学
    • 機械工学

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