Change in cation nonstoichiometry at interfaces during crystal growth in polycrystalline BaTiO3

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

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    Using an embedded single crystal in a polycrystalline matrix and quantitative electron energy loss spectroscopy, we have demonstrated that Ti-excess grain boundary nonstoichiometry can vary with the extent of boundary migration. While a slight excess in Ti was detected at the boundaries between small matrix grains, a large increase in Ti/Ba ratio, to as much as ∼1.50 compared to the stoichiometric value, was present at the interface between a growing single crystal and the matrix grains when the embedded crystal grew up to a few hundred micrometers. This change in nonstoichiometry was attributed to a continuous accumulation of excessive Ti at the moving boundary during crystal growth. The present result indicates that growth kinetics can critically affect the interface chemistry in polycrystals.

    Original languageEnglish
    Article number011909
    JournalApplied Physics Letters
    Volume88
    Issue number1
    DOIs
    Publication statusPublished - 2006

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

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