Structure analysis of ferroelectric domain walls using coherent convergent-beam electron diffraction

• Project/Area Number: 25630272
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Inorganic materials/Physical properties
• Research Institution: Tohoku University
• Principal Investigator: TSUDA Kenji 東北大学, 多元物質科学研究所, 准教授 (00241274)
• Co-Investigator(Renkei-kenkyūsha): TERAUCHI Masami 東北大学, 多元物質科学研究所, 教授 (30192652) ; NISHIMATSU Takeshi 東北大学, 金属材料研究所, 助教 (70323095)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 電子顕微鏡 / 収束電子回折 / 界面構造解析 / 誘電体物性 / 強誘電ドメイン

Outline of Final Research Achievements

We have attempted to develop a method using the coherent CBED technique, which observes interference fringes appearing in overlapping areas of adjacent CBED disks. We performed coherent CBED experiments to observe ferroelectric domain boundaries of hexagonal YMnO3, using a TEM equipped with a cold-type field emission electron gun, a spherical aberration corrector and an Omega-type energy-filter. Phase differences due to the structure of the domain boundary have been first observed in the interference fringes. A software to simulate coherent CBED patterns at domain boundaries has been developed on the basis of the multiple scattering (dynamical diffraction) theory. Applications of the CBED method to phase transition materials were also conducted.

Research Products

• [Journal Article] Effects of W on microstructure of as-cast 28 wt.%Cr-2.6 wt.%C-(0-10) wt.%W irons (2015)
  • Author(s): S. Imurai, C. Thanachayanont, J.T.H. Pearce, K. Tsuda and T. Chairuangsri
  • Journal Title: Materials Characterization Volume: 99 Pages: 52-60
  • DOI: 10.1016/j.matchar.2014.11.012
  • Peer Reviewed
• [Journal Article] Effects of Mo on microstructure of as-cast 28 wt.% Cr-2.6 wt.% C-(0-10) wt.% Mo irons (2014)
  • Author(s): S. Imurai, C. Thanachayanont, J. T. H. Pearce, K. Tsuda and T. Chairuangsri
  • Journal Title: Materials Characterization Volume: 09 Pages: 99-112
  • DOI: 10.1016/j.matchar.2014.01.014
  • Peer Reviewed
• [Journal Article] Van der Waals epitaxial growth of topological insulator Bi2 x Sb x Te3 y Se y ultrathin nanoplate on electrically insulating fluorophlogopite mica (2014)
  • Author(s): Ngoc Han Tu, Yoichi Tanabe, Khuong Kim Huynh, Yohei Sato, Hidetoshi Oguro, Satoshi Heguri, Kenji Tsuda, Masami Terauchi, Kazuo Watanabe, and Katsumi Tanigaki
  • Journal Title: Appl. Phys. Lett. Volume: 105 Issue: 6
  • DOI: 10.1063/1.4892576
  • Peer Reviewed
• [Journal Article] A ferroelectric-like structural transition in a metal (2013)
  • Author(s): Y. Shi, Y. Guo, X. Wang, A.J. Princep, D. Khalyavin, P. Manuel, Y. Michiue, A. Sato, K. Tsuda, S. Yu, M. Arai, Y. Shirako, M. Akaogi, N. Wang, K. Yamaura, A.T. Boothroyd
  • Journal Title: Nature Materials Volume: 12 Issue: 11 Pages: 1024-1027
  • DOI: 10.1038/nmat3754
  • Peer Reviewed
• [Journal Article] High-quality AlN layer homoepitaxially grown on nitrided a-plane sapphire (2013)
  • Author(s): Masayoshi Adachi, Kenji Tsuda, Masashi Sugiyama, Junji Iida, Akikazu Tanaka, and Hiroyuki Fukuyama
  • Journal Title: Applied Physics Express Volume: 6 Issue: 9 Pages: 91001-3
  • DOI: 10.7567/apex.6.091001
  • Peer Reviewed
• [Presentation] 収束電子回折によるLiOsO3の静電ポテンシャル分布解析 (2014)
  • Author(s): 津田健治
  • Organizer: 日本結晶学会平成26年度年会
  • Place of Presentation: 東京大学，東京
  • Year and Date: 2014-11-01 – 2014-11-03
• [Presentation] Study of nanoscale local structural fluctuations in ferroelectrics using convergent-beam electron diffraction (2014)
  • Author(s): Kenji Tsuda
  • Organizer: RCBJSF-2014 -FM&NT
  • Place of Presentation: Riga, Latvia
  • Year and Date: 2014-09-29 – 2014-10-02
  • Invited
• [Presentation] 収束電子回折によるLiOsO3の静電ポテンシャル分布解析 (2014)
  • Author(s): 津田健治
  • Organizer: 第31回強誘電体応用会議 (FMA31)
  • Place of Presentation: コープイン京都，京都
  • Year and Date: 2014-05-28 – 2014-05-31
• [Presentation] 収束電子回折法によるLiOsO3の静電ポテンシャル分布解 (2013)
  • Author(s): 渡邊郁磨，津田健治，Youguo Shi，Yanfeng Guo，山浦一成
  • Organizer: 日本顕微鏡学会第57回シンポジウム
  • Place of Presentation: 名古屋
• [Presentation] Electrostatic potential analysis of ferroelectrics using convergent-beam electron diffraction (2013)
  • Author(s): Kenji Tsuda
  • Organizer: Electron Microscopy & Multiscale Modeling 2013 (EMMM2013)
  • Place of Presentation: Kyoto University, Kyoto
  • Invited
• [Book] やさしい電子回折と初等結晶学 -- 電子回折図形の指数付け，収束電子回折の使い方 -- 改訂新版 (2014)
  • Author(s): 田中通義、寺内正己、津田健治
  • Total Pages: 250
  • Publisher: 共立出版