Assessment of Strain-Generated Oxygen Vacancies Using SrTiO3 Bicrystals

Si Young Choi, Sung Dae Kim, Minseok Choi, Hak Sung Lee, Jungho Ryu, Naoya Shibata, Teruyasu Mizoguchi, Eita Tochigi, Takahisa Yamamoto, Suk Joong L. Kang, Yuichi Ikuhara

研究成果: Article査読

47 被引用数 (Scopus)

抄録

Atomic-scale defects strongly influence the electrical and optical properties of materials, and their impact can be more pronounced in localized dimensions. Here, we directly demonstrate that strain triggers the formation of oxygen vacancies in complex oxides by examining the tilt boundary of SrTiO3 bicrystals. Through transmission electron microscopy and electron energy loss spectroscopy, we identify strains along the tilt boundary and oxygen vacancies in the strain-imposed regions between dislocation cores. First-principles calculations support that strains, irrespective of their type or sign, lower the formation energy of oxygen vacancies, thereby enhancing vacancy formation. Finally, current-voltage measurements confirm that such oxygen vacancies at the strained boundary result in a decrease of the nonlinearity of the I-V curve as well as the resistivity. Our results strongly indicate that oxygen vacancies are preferentially formed and are segregated at the regions where strains accumulate, such as heterogeneous interfaces and grain boundaries. (Graph Presented).

本文言語English
ページ(範囲)4129-4134
ページ数6
ジャーナルNano Letters
15
6
DOI
出版ステータスPublished - 2015 6 10
外部発表はい

ASJC Scopus subject areas

  • バイオエンジニアリング
  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学
  • 機械工学

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