Site-selectivity of 3d metal cation dopants and dielectric response in calcium copper titanate

Sung Yoon Chung, Si Young Choi, Takahisa Yamamoto, Yuichi Ikuhara, Suk Joong L. Kang

    Research output: Contribution to journalArticlepeer-review

    47 Citations (Scopus)

    Abstract

    By doping a few atomic percent of 3d -block cations, we demonstrate that the high dielectric response in Ca Cu3 Ti4 O12 can be reduced by a factor of ∼ 103 at room temperature. Each of the added dopants shows its own preferential substitution on either Cu or Ti sites. The dopants that act as acceptors have a critical impact on the disappearance of the electrostatic potential barrier at grain boundaries, resulting in drastically decreased permittivity values of <90 without voltage dependence. The present doping experiment directly shows that the potential barrier at internal interfaces is a key factor for the peculiar dielectric phenomena.

    Original languageEnglish
    Article number091917
    JournalApplied Physics Letters
    Volume88
    Issue number9
    DOIs
    Publication statusPublished - 2006 Feb 27

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

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