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Enhancement of room-temperature ductility of ceramic single crystals

Research Project

Project/Area Number 16K14414
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Structural/Functional materials
Research InstitutionNagoya University

Principal Investigator

NAKAMURA ATSUTOMO  名古屋大学, 工学研究科, 准教授 (20419675)

Project Period (FY) 2016-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2016: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Keywords格子欠陥 / 結晶塑性 / 低温脆性 / セラミックス / 電子構造制御 / 酸化物 / 単結晶 / 半導体 / 構造・機能材料 / イオン結晶 / 室温変形
Outline of Final Research Achievements

Most ceramics are brittle at room temperatures. This is believed to be because large translation vectors in crystal structures leads to the large Burgers vector of dislocations, resulting in the large Peierls stress. In contrast, strontium titanate single (SrTiO3) crystals exhibit ductility even at room temperature if they are deformed at slow strain-rate although SrTiO3 is a ceramic with the large translation vector. In this study, therefore, uniaxial deformation tests were conducted for SrTiO3 single crystals with different chemical compositions, in order to reveal the influence of point defects on room-temperature plastic deformation of SrTiO3. It was found that SrTiO3 single crystals grown from the powder with a particular Sr/Ti ratio exhibited lower deformation stress and larger failure strain, as compared to SrTiO3 crystals with the other ratio. It is remarkable that room-temperature ductility of ceramic crystals is dependent on the introduced point defects.

Report

(2 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • Research Products

    (14 results)

All 2017 2016 Other

All Journal Article (7 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 7 results,  Acknowledgement Compliant: 4 results) Presentation (6 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results) Remarks (1 results)

  • [Journal Article] First-principles calculations on slip system activation in the rock salt structure: Electronic origin of ductility in silver chloride2017

    • Author(s)
      A. Nakamura, M. Ukita, N. Shimoda, Y. Furushima, K. Toyoura, K. Matsunaga
    • Journal Title

      Philosophical Magazine

      Volume: 97 Issue: 16 Pages: 1281-1310

    • DOI

      10.1080/14786435.2017.1294270

    • NAID

      120006331821

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Dislocation structures and electrical conduction properties of low angle tilt grain boundaries in LiNbO32016

    • Author(s)
      Yuho Furushima, Atsutomo Nakamura, Eita Tochigi, Yuichi Ikuhara, Toyoura Kazuaki, Matsunaga Katsuyuki
    • Journal Title

      Journal of Applied Physics

      Volume: 120 Issue: 14 Pages: 142107-142107

    • DOI

      10.1063/1.4961706

    • NAID

      120006331828

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Pressure-induced phase transition of calcite and aragonite: A first principles study2016

    • Author(s)
      M. Ukita, K. Toyoura, A. Nakamura, K. Matsunaga
    • Journal Title

      Journal of Applied Physics

      Volume: 120 Issue: 14 Pages: 142118-142118

    • DOI

      10.1063/1.4961723

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Atomic Structure Characterization of Stacking Faults on the {1-100} plane in α-Alumina by Scanning Transmission Electron Microscopy2016

    • Author(s)
      Eita Tochigi, Scott D. Findlray, Eiji Okunishi, Teruyasu Mizoguchi, Atsutomo Nakamura, Naoya Shibata, Yuichi Ikuhara
    • Journal Title

      AIP Conference Proceedings

      Volume: 1763 Pages: 50003-50003

    • DOI

      10.1063/1.4961356

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Adsorption sites of single noble metal atoms on the rutile TiO2 (110) surface influenced by different surface oxygen vacancies2016

    • Author(s)
      K. Matsunaga, T.-Y. Chang, R. Ishikawa, Q. Dong, K. Toyoura, A. Nakamura, Y. Ikuhara and N. Shibata
    • Journal Title

      J. Phys.: Condens. Matter.

      Volume: 28 Issue: 17 Pages: 175002-175002

    • DOI

      10.1088/0953-8984/28/17/175002

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Room-temperature deformation behavior of SrTiO3 single crystals with different chemical compositions2016

    • Author(s)
      A. Nakamura, K. Yasufuku, Y. Furushima, K. Toyoura, K. Matsunaga
    • Journal Title

      AMTC Letters

      Volume: 5 Pages: 184-185

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Dislocation structures at (0001)/<112-0> low-angle tilt grain boundaries in lithium niobate2016

    • Author(s)
      Y. Furushima, A. Nakamura, E. Tochigi, Y. Ikuhara, K. Toyoura, K. Matsunaga
    • Journal Title

      AMTC Letters

      Volume: 5 Pages: 40-41

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Presentation] SrTiO3小角粒界における[012]転位の形成2017

    • Author(s)
      古嶋佑帆, 荒川 祐樹, 中村篤智, 栃木栄太, 松永克志
    • Organizer
      日本セラミックス協会 2017年会
    • Place of Presentation
      日本大学(駿河台キャンパス)
    • Year and Date
      2017-03-17
    • Related Report
      2016 Annual Research Report
  • [Presentation] マグネシアの(110)/[001]小傾角粒界における転位偏析挙動2016

    • Author(s)
      澤田康佑, 中村篤智, 栃木栄太, 豊浦和明, 幾原雄一, 松永克志
    • Organizer
      日本機械学会 M&M2016材料力学カンファレンス
    • Place of Presentation
      神戸大学
    • Year and Date
      2016-10-08
    • Related Report
      2016 Annual Research Report
  • [Presentation] Room Temperature Deformation Behavior of SrTiO3 Single Crystals2016

    • Author(s)
      A. Nakamura, K. Yasufuku, Y. Furushima, K. Toyoura, K. Matsunaga
    • Organizer
      The 9th Pacific Rim International Conference on Advanced Materials and Processing
    • Place of Presentation
      Kyoto, Japan
    • Year and Date
      2016-08-01
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Structures and properties of low angle grain boundaries in lithium niobate2016

    • Author(s)
      A. Nakamura
    • Organizer
      European Confarence on Fracture (ECF21)
    • Place of Presentation
      Catania, Italy
    • Year and Date
      2016-06-20
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Electric conductivity along lattice defects in lithium niobate2016

    • Author(s)
      A. Nakamura, Y. Furushima, E. Tochigi, Y. Ikuhara, K. Toyoura, K. Matsunaga
    • Organizer
      THERMEC 2016
    • Place of Presentation
      Graz, Austria
    • Year and Date
      2016-05-29
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Room-temperature deformation behavior of SrTiO3 single crystals with different chemical compositions2016

    • Author(s)
      A. Nakamura, K. Yasufuku, Y. Furushima, K. Toyoura, K. Matsunaga
    • Organizer
      AMTC5
    • Place of Presentation
      Nagoya, Japan
    • Year and Date
      2016-05-11
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Remarks] 名古屋大学大学院工学研究科物質科学専攻 材料設計工学研究グループ

    • URL

      http://www.numse.nagoya-u.ac.jp/matsunaga/

    • Related Report
      2016 Annual Research Report

URL: 

Published: 2016-04-21   Modified: 2018-03-22  

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