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Extraordinary plastic deformation of ionic inorganic crystals based on dislocation quantum structures

Research Project

Project/Area Number 18H03838
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 26:Materials engineering and related fields
Research InstitutionNagoya University

Principal Investigator

Matsunaga Katsuyuki  名古屋大学, 工学研究科, 教授 (20334310)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥44,850,000 (Direct Cost: ¥34,500,000、Indirect Cost: ¥10,350,000)
Fiscal Year 2020: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2019: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2018: ¥20,150,000 (Direct Cost: ¥15,500,000、Indirect Cost: ¥4,650,000)
Keywords転位 / 移動度 / 電子構造 / すべり変形 / 易動度
Outline of Final Research Achievements

In this study, first-principles calculations were performed for glide dislocations in ZnS and ZnTe, in order to reveal a physical origin of experimentally observed light-dependent plasticity. It was experimentally reported that glide dislocations in ZnS are dissociated into two partial dislocations with stacking faults in between. The present calculations revealed that glide partial dislocations in ZnS tend to have unreconstructed core structures in their ground state. However, atomic structures of the glide dislocations can be reconstructed in the presence of carriers. Since atomic reconstruction of dislocation cores leads to decreased dislocation mobilities, the glide dislocations in ZnS can be strongly restricted in their motion when ZnS is exposed to external visible lights. It was also found that ZnTe also exhibits the similar results.

Academic Significance and Societal Importance of the Research Achievements

セラミックスは、他の材料にない優れた物性を持つ材料であるが、その脆い機械的性質がさらなる応用を阻んできた。しかし最近の研究で、光の有無によって、機械的性質が劇的に変化する無機結晶が存在することが判明した。本研究では、その代表例である硫化亜鉛結晶を主たる対象とし研究を進めたところ、その現象の起源がすべり転位という格子欠陥の局所的な電子状態にあることを明らかにした。この知見を活かした、材料合成や加工方法への応用とそれに伴う新たな展開が期待できる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (6 results)

All 2021 2019 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results,  Invited: 5 results)

  • [Journal Article] Theoretical Calculations of Characters and Stability of Glide Dislocations in Zinc Sulfide2019

    • Author(s)
      M. Ukita, R.Nagahara, Y.Oshima, A. Nakamura, T. Yokoi, Matsunaga
    • Journal Title

      MATERIALS TRANSACTIONS

      Volume: 60 Issue: 1 Pages: 99-104

    • DOI

      10.2320/matertrans.M2018253

    • NAID

      130007550007

    • ISSN
      1345-9678, 1347-5320
    • Year and Date
      2019-01-01
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] ZnSの転位ナノ構造と光照射硬化2021

    • Author(s)
      松永克志
    • Organizer
      日本金属学会 2021年春期講演大会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Electronic and atomic structures of dislocations and their related mechanical properties in II-VI group semiconducting materials2019

    • Author(s)
      松永克志
    • Organizer
      The International Conference on High-Performance Ceramics (CICC-11)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Electronic Mechanism of Room-Temperature Large Plasticity of Inorganic Compounds2019

    • Author(s)
      K. Matsunaga
    • Organizer
      43rd International Conference and Exposition on Advanced Ceramics and Composites (ICACC 2019)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] イオン性無機結晶の転位量子構造と塑性2018

    • Author(s)
      松永克志
    • Organizer
      日本金属学会 2018年秋期(第163回)講演大会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 暗室環境下における硫化亜鉛結晶の大塑性変形能と転位構造2018

    • Author(s)
      松永克志、大島優、中村篤智
    • Organizer
      日本顕微鏡学会 第61回シンポジウム
    • Related Report
      2018 Annual Research Report
    • Invited

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Published: 2018-04-23   Modified: 2022-01-27  

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