Direct determination of dopant site selectivity in ordered perovskite CaCu3Ti4O12 polycrystals by aberration-corrected STEM

Si Young Choi, Sung Yoon Chung, Takahisa Yamamoto, Yuichi Ikuhara

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    18 Citations (Scopus)

    Abstract

    A direct determination of dopant site selectivity in ordered perovskite CaCu3Ti4O12 polycrystals was reported. Scanning Transmission Electron Microscopy (STEM) with a spherical aberration corrector and Electron Energy Loss Spectroscopy (EELS) analysis were utilized for direct visualization and chemical identification of each atomic column. Image simulation was carried out before the observation of CaCu3Ti 4O12 doped with 5% La in STEM, to predict the variations in the intensity of each atomic column by doping. Considering CaCu 3Ti4O12 as a complex perovskite oxide showed that doped aliovalent La cations are substituted for Ca, even though 75% of A sites are composed of Cu. The results reveals that La cations are preferentially substituted for Ca sites in CaCu3Ti4O12 indicating an ordered behavior of occupations.

    Original languageEnglish
    Pages (from-to)885-889
    Number of pages5
    JournalAdvanced Materials
    Volume21
    Issue number8
    DOIs
    Publication statusPublished - 2009 Feb 23

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

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