First principles study on intrinsic vacancies in cubic and orthorhombic CaTiO3

Haksung Lee, Teruyasu Mizoguchi, Takahisa Yamamoto, Yuichi Ikuhara

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    The structural relaxations and the formation energies of intrinsic defects in cubic and orthorhombic CaTiO3 were investigated by a first principles projector-augmented wave method. It was found that cations and oxygen vacancies in both phases cause extra levels near the valence band maximum and the conduction band minimum, respectively, and the Ti-vacancy induced level in orthorhombic CaTiO3 is closer to the valence band maximum than that in cubic CaTiO3. Among the neutral defect species, including neutral isolated vacancy, partial Schottky, and full Schottky, it was found that the Vca2- + Vo2+ and Vo 0 are the most preferable defect species for orthorhombic CaTiO 3 under reduction and oxidization conditions, respectively, whereas the Vca2- + Vo2+ partial Schottky is always stable in any atmosphere in cubic CaTiO3. As compared to cubic CaTiO3, it was found that orthorhombic CaTiO3 shows higher defect formation energies.

    Original languageEnglish
    Pages (from-to)977-983
    Number of pages7
    JournalMaterials Transactions
    Volume50
    Issue number5
    DOIs
    Publication statusPublished - 2009 May 1

    Keywords

    • Calcium titanate
    • Calculation
    • Defect energetics

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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