Formation of potential barrier related to grain-boundary character in semiconducting barium titanate

Katsuro Hayashi, Takahisa Yamamoto, Yuichi Ikuhara, Taketo Sakuma

    Research output: Contribution to journalArticlepeer-review

    39 Citations (Scopus)

    Abstract

    Resistance-temperature (R-T) characteristics were measured directly at single-grain boundaries in 0.1-mol%-niobium-doped barium titanate bicrystals that had been fabricated from polycrystalline sinters, to determine a geometrical grain-boundary character dependence of the positive temperature coefficient of resistivity (PTCR) effect. Both random boundaries and low-Σ boundaries exhibit a similar grain-boundary character dependence of the PTCR effect through a simple geometrical analysis, using the coincidence of reciprocal lattice points. Differences of the R-T characteristics in individual boundaries have been explained in terms of the formation of a potential barrier that is associated with the oxidation of grain boundaries during cooling, after sintering or annealing. The grain-boundary character is likely to affect the diffusivity of O2- ions and, hence, is crucial to the formation of the potential barrier.

    Original languageEnglish
    Pages (from-to)2684-2688
    Number of pages5
    JournalJournal of the American Ceramic Society
    Volume83
    Issue number11
    DOIs
    Publication statusPublished - 2000 Jan 1

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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