Current-voltage characteristics of Σ1 boundaries with and without cobalt ions in niobium-doped SrTiO3 bicrystals

Takahisa Yamamoto, Katsuro Hayashi, Yuichi Ikuhara, Taketo Sakuma

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    13 Citations (Scopus)


    Current-voltage (I-V) characteristics across Σ1 boundaries of Nb-doped SrTiO3 bicrystals were investigated with a special interest in the effect of an impurity ion, cobalt. The Σ1 boundary with cobalt ions was fabricated by hot-joining technique after evaporating metallic cobalt onto the (001) plane used for a contact plane. High-resolution transmission electron microscopy (HREM) study associated with X-ray energy dispersive spectroscopy (EDS) revealed that cobalt solved and distributed around the Σ1 boundary which was perfectly joined without any second films. It was found that the Σ1 boundary with cobalt ions exhibited a nonlinear I-V relationship while the Σ1 boundary without cobalt ions showed a linear I-V relationship. This result indicates that the presence of cobalt itself at the boundary can form a potential barrier irrespective of grain boundary coherency.

    Original languageEnglish
    Pages (from-to)1527-1529
    Number of pages3
    JournalJournal of the American Ceramic Society
    Issue number6
    Publication statusPublished - 2000 Jan 1

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Geology
    • Geochemistry and Petrology
    • Materials Chemistry

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