First-principles study on structures and energetics of intrinsic vacancies in SrTiO3

Tomohito Tanaka, Katsuyuki Matsunaga, Yuichi Ikuhara, Takahisa Yamamoto

    Research output: Contribution to journalArticle

    Abstract

    We have performed first-principles plane-wave pseudopotential calculations to study the electronic structures, structural optimization, and formation energies of intrinsic vacancies in bulk SrTiO3. The anion and cation vacancy-induced levels appeared near the valence- and conduction-band edges in the band gap. The formation energies of isolated vacancies with different charge states were obtained, and the defect reaction energies, such as Sr partial Schottky (VSr2- + VO2+), Ti partial Schottky (VTi4- + 2VO+), and full Schottky (VSr2- + VTi4- + 3 VO2+) were also evaluated. It was found that depending on the atomic chemical potentials, the relative stability of the defect species or reactions is different. The overall trend of the stable defect structures can explain the electrical conductivity of SrTiO3 for different chemical environments experimentally observed.

    Original languageEnglish
    Article number205213
    Pages (from-to)2052131-2052138
    Number of pages8
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume68
    Issue number20
    Publication statusPublished - 2003 Nov 1

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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    Tanaka, T., Matsunaga, K., Ikuhara, Y., & Yamamoto, T. (2003). First-principles study on structures and energetics of intrinsic vacancies in SrTiO3. Physical Review B - Condensed Matter and Materials Physics, 68(20), 2052131-2052138. [205213].