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透過型電子顕微鏡による、セラミックス粒界構造解析

Research Project

Project/Area Number 12F02783
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section外国
Research Field Inorganic materials/Physical properties
Research InstitutionTohoku University

Principal Investigator

幾原 雄一  東北大学, 原子分子材料科学高等研究機構, 教授 (70192474)

Co-Investigator(Kenkyū-buntansha) MENG Fanzhi  東北大学, 原子分子材料科学高等研究機構, 外国人特別研究員
FANZHI Meng  東北大学, 原子分子材料科学高等研究機構, 外国人特別研究員
FANZHI Meng  東北大学, 原子分子材料科学高等研究機構, 外国人特別研究員
Project Period (FY) 2012-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2014: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2013: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2012: ¥600,000 (Direct Cost: ¥600,000)
Keywordsgrain boundary / electron microscopy / ceramics / 走査透過型電子顕微鏡 / セラミックス / 界面原子構造 / 構造解析
Outline of Annual Research Achievements

In this study, we fabricated a bicrystal, possessing bi-crystallographic relations of (310)[001]||(310)[001] between upper and lower crystals. Analysis of diffraction patterns confirms these orientations to within a small misfit tilt angle, and high-resolution TEM(HRTEM) reveals a perfect joining at atomic level. The HRTEM image of the grain boundary(GB) of the MgO bicrystal shows that MgO atoms were arranged symmetrically on the GB and the stronger bright spots are arranged periodically at intervals of 0.62 nm on the GB. Since this periodic arrangement of atoms is the very property of the Σ5 GB, we can confirm that a Σ5 symmetric tilt GB is manufactured. In addition, from the HAADF (High-Angle-Annular-Dark-Field) and EELS (Electron Energy-Loss Spectroscopy) mapping images, the very small amount impurities of calcium (Ca) and titanium (Ti) atoms are segregated at the GB at the same time, and formed the ordered array at the atomic scale which was not present in the natural three-dimensional structure. According to the theoretical calculations, the defects and the charge were strongly combined and formed a complex stable structure. This structure results in a significant change in properties of the sintered material. The strongly bound grain boundary which has such a stable structure, will increase the strength of the bulk material. It was found that the trace amounts of impurities in the ceramic grain boundary will make the ordered superstructure self-assembled, and greatly affect the physical properties of the ceramics materials.

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

Report

(3 results)
  • 2014 Annual Research Report
  • 2013 Annual Research Report
  • 2012 Annual Research Report
  • Research Products

    (2 results)

All 2014

All Presentation (2 results)

  • [Presentation] Copper Oxidation Investigation with TEM and HRTEM2014

    • Author(s)
      F. Z. Meng, Z. C. Wang, C. L. Chen, M. Saito, and Y. Ikuhara
    • Organizer
      The Second International Conference of Young Researchers on Advanced Materials (IUMRS-ICYRAM2014)
    • Place of Presentation
      Haikou, China
    • Year and Date
      2014-10-24 – 2014-10-29
    • Related Report
      2014 Annual Research Report
  • [Presentation] TEM Investigation of the Oxidation of Copper2014

    • Author(s)
      F. Z. Meng, Z. C. Wang, M. Saito, C. L. Chen, and Y. Ikuhara
    • Organizer
      The 4th International Symposium on Advanced Microscopy and Theoretical Calculations (AMTC4)
    • Place of Presentation
      静岡県浜松市
    • Year and Date
      2014-05-08 – 2014-05-10
    • Related Report
      2014 Annual Research Report

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Published: 2013-04-25   Modified: 2024-03-26  

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