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2020 Fiscal Year Final Research Report

Complex point defect analysis by high temporal resolution STEM

Research Project

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Project/Area Number 18H01823
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 28030:Nanomaterials-related
Research InstitutionThe University of Tokyo

Principal Investigator

Ishikawa Ryo  東京大学, 大学院工学系研究科(工学部), 特任准教授 (20734156)

Project Period (FY) 2018-04-01 – 2021-03-31
Keywords高速電子顕微鏡法 / 拡散 / 複合点欠陥
Outline of Final Research Achievements

We have successfully developed a new high temporal-resolution scanning transmission electron microscopy (STEM). The developed scan coils have 200 times smaller inductances than that in the previous generation, and we can acquire 25 frames of atomic-resolution STEM images as per second (512×512 pixels), where the acquisition time is 83 nano seconds per pixel. Utilizing such high temporal- resolution, it becomes possible to directly observe dynamics of point defects within solids or on the surface. The present study could open the way to perform dynamic STEM observations at atomic-scale.

Free Research Field

材料科学

Academic Significance and Societal Importance of the Research Achievements

走査透過型電子顕微鏡は高い空間分解能を有することから,材料中に形成される点欠陥などの原子構造解析において重要な役割を果たしてきた.しかし,材料機能の本質的な理解には,材料やデバイスの実環境下における挙動を原子レベルで明らかにすることが要求される.本研究では,従来の原子分解能を保持しつつ時間分解能を改善することにより,原子レベルでのダイナミクスが観察可能な顕微鏡法の開発を行った.本顕微鏡法は,高温,ガス雰囲気,液中などの様々な環境下における動的観察の実現に向けて必要不可欠な手法であり,今後の材料開発での幅広い応用が期待される.

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Published: 2022-01-27  

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