Direct observation of the double Schottky barrier in niobium-doped barium titanate by the charge-collection current method

Noriyasu Kataoka, Katsuro Hayashi, Takahisa Yamamoto, Yoshihiro Sugawara, Yuichi Ikuhara, Taketo Sakuma

    Research output: Contribution to journalArticlepeer-review

    28 Citations (Scopus)

    Abstract

    Charge-collection (CC) current was measured at a single grain boundary, which exhibited positive temperature coefficient of resistivity (PTCR) effects, in 0.1-mol%-Nb-doped BaTiO3. The CC current systematically reversed across the grain boundary above the Curie point, which indicated the presence of a double Schottky barrier (DSB) at the grain boundary. In contrast, the CC current was constant across the grain boundary below the Curie temperature. The result obtained from the CC current measurement agrees with the classical DSB model in donordoped BaTiO3, indicating the PTCR effects.

    Original languageEnglish
    Pages (from-to)1961-1963
    Number of pages3
    JournalJournal of the American Ceramic Society
    Volume81
    Issue number7
    DOIs
    Publication statusPublished - 1998 Jul

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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