First sharp diffraction mapping for oxide glasses

• Project/Area Number: 15K14116
• 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: Hirata Akihiko 東北大学, 原子分子材料科学高等研究機構, 准教授 (90350488)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: ガラス / 局所構造 / 電子顕微鏡 / 電子回折 / 解析・評価 / 回折

Outline of Final Research Achievements

We applied our angstrom-beam electron diffraction technique to oxide glasses or amorphous oxides and then characterized medium-range order structures based on so-called first sharp diffraction peaks. Consequently, we successfully obtained spatially-separated local structural information from the glassy samples. For amorphous SiO, we unveiled details of the disproportionated structure by constructing a model based on local structural information.

Research Products

• [Journal Article] Atomic-scale disproportionation in amorphous silicon monoxide (2016)
  • Author(s): A. Hirata,S. Kohara, T. Asada, M. Arao, C. Yogi, H. Imai, Y. Tan, T. Fujita, M. W. Chen
  • Journal Title: Nature communications 7 Volume: - Issue: 1 Pages: 11591-11591
  • DOI: 10.1038/ncomms11591
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Atomic-scale disproportionation in amorphous silicon monoxide (2016)
  • Author(s): Akihiko Hirata, Shinji Kohara, Toshihiro Asada, Masazumi Arao, Chihiro Yogi, Hideto Imai, Yongwen Tan, Takeshi Fujita, Mingwei Chen
  • Journal Title: Nature Communications Volume: 印刷中
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Distortion of Local Atomic Order in Metallic Glasses (2016)
  • Author(s): A. Hirata, T. Fujita, A. R. Yavari, and M. W. Chen
  • Organizer: 23rd International Symposium on Metastable, Amorphous and Nanostructured Materials
  • Place of Presentation: Nara
  • Year and Date: 2016-07-03
  • Int'l Joint Research / Invited
• [Presentation] Structural characterization of disproportionated amorphous silicon monoxide (2015)
  • Author(s): A. Hirata, T. Asada, M. Arao, H. Imai, S. Kohara, M. W. Chen
  • Organizer: STAC9
  • Place of Presentation: つくば国際会議場（茨城県・つくば市）
  • Year and Date: 2015-10-19
  • Int'l Joint Research / Invited