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

Tomohito Tanaka, Katsuyuki Matsunaga, Yuichi Ikuhara, Takahisa Yamamoto

    研究成果: Article査読

    抄録

    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.

    本文言語English
    論文番号205213
    ページ(範囲)2052131-2052138
    ページ数8
    ジャーナルPhysical Review B - Condensed Matter and Materials Physics
    68
    20
    出版ステータスPublished - 2003 11月 1

    ASJC Scopus subject areas

    • 電子材料、光学材料、および磁性材料
    • 凝縮系物理学

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