Grain-boundary plane orientation dependence of electrical barriers at Σ5 boundaries in SrTiO3

Sung Bo Lee, Jong Heun Lee, Yoon Ho Cho, Doh Yeon Kim, Wilfried Sigle, Fritz Phillipp, Peter A. van Aken

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    11 Citations (Scopus)

    Abstract

    Dependence of the electrical properties on grain-boundary plane orientation is examined by a combination of high-resolution transmission electron microscopy, impedance spectroscopy, and electron energy-loss spectrometry using two kinds of SrTiO3 Σ5 ([1 0 0]/36.8°) bicrystalline grain boundaries: symmetric (3 1 0) (18.4°/18.4°) and asymmetric (8.4°/28.4°). While the symmetric grain boundary is observed to be straight with the symmetric (3 1 0)//(3 1 0) plane orientation, the asymmetric grain boundary is faceted into symmetric (3 1 0)//(3 1 0) and (2 1 0)//(2 1 0), and asymmetric (1 0 0)//(4 3 0). Grain-boundary impedance is observed only in the asymmetric grain boundary, and the electron energy-loss spectrometry quantification indicates that the asymmetric (1 0 0)//(4 3 0) facets are more oxygen-deficient than the symmetric ones. The results suggest that the asymmetric (1 0 0)//(4 3 0) facets are the most resistive among the three different facets.

    Original languageEnglish
    Pages (from-to)4993-4997
    Number of pages5
    JournalActa Materialia
    Volume56
    Issue number18
    DOIs
    Publication statusPublished - 2008 Oct

    Bibliographical note

    Funding Information:
    We thank Mrs. Ute Salzberger for the TEM specimen preparation. The help at the ARM of Mr. Rainer Höschen is acknowledged. This work was supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2007-314-D00107).

    Keywords

    • Annealing
    • Electron energy-loss spectroscopy
    • Grain-boundary structure
    • Strontium titanate
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Ceramics and Composites
    • Polymers and Plastics
    • Metals and Alloys

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