Grain boundary atomic structures in SrTiO3 and BaTiO3

T. Yamamoto, T. Mizoguchi, S. Y. Choi, Y. Sato, N. Shibata, Y. Ikuhara

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

SrTiO3 bicrystals with various types of grain boundaries were prepared by joining two single crystals at high temperature. By using the bicrystals, we examined their current-voltage characteristics across single grain boundaries from a viewpoint of point defect segregation in the vicinity of the grain boundaries. Current-voltage property in SrTiO3 bicrystals was confirmed to show a cooling rate dependency from annealing temperature, indicating that cation vacancies accumulate due to grain boundary oxidation. The theoretical results obtained by ab-initio calculation clearly showed that the formation energy of Sr vacancies is the lowest comparing with Ti and O vacancies in oxidized atomosphere. The formation of a double Schottky barrier (DSB) in n-type SrTiO3 is considered to be closely related to the accumulation of the charged Sr vacancies. Meanwhile, by using three types of low angle boundaries, the excess charges related to one grain boundary dislocation par unit length was estimated. In this study, we summarized our results obtained in our group.

本文言語English
ホスト出版物のタイトルRecrystallization and Grain Growth III - Proceedings of the Third International Conference on Recrystallization and Grain Growth, ReX and GG III
出版社Trans Tech Publications Ltd
ページ851-856
ページ数6
PART 2
ISBN(印刷版)087849443X, 9780878494439
DOI
出版ステータスPublished - 2007
外部発表はい
イベント3rd International Conference on Recrystallization and Grain Growth, ReX GG III - Jeju Island, Korea, Republic of
継続期間: 2007 6月 102007 6月 15

出版物シリーズ

名前Materials Science Forum
番号PART 2
558-559
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

Other

Other3rd International Conference on Recrystallization and Grain Growth, ReX GG III
国/地域Korea, Republic of
CityJeju Island
Period07/6/1007/6/15

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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