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Grain boundary structure of ceramics

Research Project

Project/Area Number 26249088
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals/Metal-base materials
Research InstitutionNagoya University

Principal Investigator

Yamamoto Takahisa  名古屋大学, 工学研究科, 教授 (20220478)

Co-Investigator(Kenkyū-buntansha) 佐々木 勝寛  名古屋大学, 工学(系)研究科(研究院), 准教授 (00211938)
徳永 智春  名古屋大学, 工学(系)研究科(研究院), 助教 (90467332)
Co-Investigator(Renkei-kenkyūsha) MUTO Shunsuke  名古屋大学, 未来材料システム研究所, 教授 (20209985)
Project Period (FY) 2014-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥39,520,000 (Direct Cost: ¥30,400,000、Indirect Cost: ¥9,120,000)
Fiscal Year 2016: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
Fiscal Year 2015: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000)
Fiscal Year 2014: ¥21,840,000 (Direct Cost: ¥16,800,000、Indirect Cost: ¥5,040,000)
Keywords結晶粒界 / 原子構造 / TEM / STEM / EELS / 焼結 / 粒界構造 / 窒化 / 粒界 / 電子状態 / SrTiO3 / 構造ユニット / HRTEM / FAST / FLASH / HAADF
Outline of Final Research Achievements

Unique coordination polyhedral are formed at grain boundaries, which are different from those in grain interiors. These unique coordination polyhedral often affect physical properties of polycrtals. In this study, we investigated that the relationship between the grain boundary structures and phenomena due to the unique coordination polyhedras. For example, applied electric fields greatly enhance the shrinkage rate of ceramic green compacts. The electric fields tend to concentrate at grain boundaries. The concentration of the fileds were found to reduce at/near grain boundaries by using HR-TEM/STEM, EELS and so on. In order to use the reducing phenomena, we could successfully nitrize oxide ceramic in air. In addition, the reducing effects were revealed to depend on the grain orientation relationship.

Report

(4 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Annual Research Report
  • 2014 Annual Research Report

Research Products

(18 results)

All 2017 2016 2015 2014

All Journal Article (8 results) (of which Peer Reviewed: 8 results,  Acknowledgement Compliant: 7 results,  Open Access: 3 results) Presentation (10 results) (of which Invited: 1 results)

  • [Journal Article] Directly determining the polarity of WC grains in WC-12wt%Co alloy by ABF-STEM2017

    • Author(s)
      Y. Hayashi, T. Tokunaga, K. Sasaki, T. Yamamoto
    • Journal Title

      Inter. J. Refract. Met. Hard Mater.

      Volume: 62 Pages: 9-13

    • DOI

      10.1016/j.ijrmhm.2016.10.013

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Formation of grain boundary second phase in BaTiO<sub>3</sub> polycrystal under a high DC electric field at elevated temperatures2016

    • Author(s)
      Hidehiro Yoshida, Akinori Uehashi, Tomoharu Tokunaga, Katsuhiro Sasaki, Takahisa Yamamoto
    • Journal Title

      J. Ceram. Soc. Japan

      Volume: 124 Issue: 4 Pages: 388-392

    • DOI

      10.2109/jcersj2.15259

    • NAID

      130005142419

    • ISSN
      1348-6535, 1882-0743
    • Related Report
      2016 Annual Research Report 2015 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Direct observation of B-site ordering in LSAT: (La0.3Sr0.7)(Al0.65Ta0.35)O3 single crystal2016

    • Author(s)
      S. Okada, S. Kobayashi, K. Ohashi, N. Nishikawa, T. Tokunaga, K. Sasaki, T. Yamamoto
    • Journal Title

      Appl. Phys. Lett.

      Volume: 108 Pages: 251905-251905

    • DOI

      10.1063/1.4954945

    • Related Report
      2016 Annual Research Report 2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Reduction in sintering temperature for flash-sintering of yttria by nickel cation-doping2016

    • Author(s)
      Hidehiro Yoshida, Koji Morita, Byung-Nam Kim, Yoshio Sakka, Takahisa Yamamoto,
    • Journal Title

      Acta Mater.

      Volume: 106 Pages: 344-352

    • DOI

      10.1016/j.actamat.2016.01.037

    • Related Report
      2016 Annual Research Report 2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Synthesis of zirconium oxynitride in air under DC electric fields2016

    • Author(s)
      N. Morisaki, H. Yoshida, K. Matsui, T. Tokunaga, K. Sasaki, T. Yamamoto
    • Journal Title

      Appl. Phys. Lett.

      Volume: 109 Pages: 083104-083104

    • DOI

      10.1063/1.4961624

    • Related Report
      2016 Annual Research Report 2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Enhancement of sintering rates in BaTiO3 by controlling of DC electric current2015

    • Author(s)
      A. Uehashi, H. Yoshida, T. Tokunaga, K. Sasaki, T. Yamamoto
    • Journal Title

      JOURNAL OF JAPANESE CERAMIC SOCIETY

      Volume: 6 Pages: 1-4

    • NAID

      130005073337

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Spatially-resolved mapping of history-dependent coupled electrochemical and electronical behaviors of electroresistive NiO2014

    • Author(s)
      I. Sugiyama, Y. Kim, S. Jesse, E. Strelcov, A. Kumar, A. Tselev, E.K. Rahani, V. B. Shenoy, T. Yamamoto, N. Shibata, Y. Ikuhara, S.V. Kalinin
    • Journal Title

      SCIENTIFIC REPORTS

      Volume: 4 Pages: 6725-6725

    • DOI

      10.1038/srep06725

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Densification behaviour and microstructural development in undoped yttria prepared by flash-sintering2014

    • Author(s)
      H. Yoshida, Y. Sakka, T. Yamamoto, J.M. Lebrun, R. Raj
    • Journal Title

      JOURNAL OF THE EUROPEAN CERAMIC SOCIETY

      Volume: 34 Pages: 991-100

    • DOI

      10.1016/j.jeurceramsoc.2013.10.031

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] イットリア添加ジルコニアのフラッシュ焼結2016

    • Author(s)
      小林 哲朗、吉田 英弘、森崎 信博、徳永 智春、佐々木 勝寛、山本 剛久
    • Organizer
      日本金属学会第159回秋季大会
    • Place of Presentation
      大阪大学
    • Year and Date
      2016-09-21
    • Related Report
      2016 Annual Research Report
  • [Presentation] 酸化物セラミックスのフラッシュ焼結における酸素空孔の効果2016

    • Author(s)
      森崎 信博、中川 悠、小林 哲朗、吉田 英弘、徳永 智春、佐々木 勝寛、山本 剛久
    • Organizer
      日本セラミックス協会第29回秋季シンポジウム
    • Place of Presentation
      広島大学
    • Year and Date
      2016-09-09
    • Related Report
      2016 Annual Research Report
  • [Presentation] イットリア安定化ジルコニアのフラッシュ焼結時に生じる窒化現象2015

    • Author(s)
      森崎信博、徳永智春、佐々木勝寛、山本剛久、松井光二、吉田英弘
    • Organizer
      日本セラミック協会第28 回秋季シンポジウム
    • Place of Presentation
      富山大学
    • Year and Date
      2015-09-16
    • Related Report
      2015 Annual Research Report
  • [Presentation] BaTiO3の電流制御フラッシュ焼結2015

    • Author(s)
      森崎信博、徳永智春、佐々木勝寛、山本剛久、吉田英弘
    • Organizer
      日本セラミック協会第28 回秋季シンポジウム
    • Place of Presentation
      富山大学
    • Year and Date
      2015-09-16
    • Related Report
      2015 Annual Research Report
  • [Presentation] 複合酸化物薄膜の構造制御と微構造解析2015

    • Author(s)
      山本剛久
    • Organizer
      日本セラミック協会第28 回秋季シンポジウム
    • Place of Presentation
      富山大学
    • Year and Date
      2015-09-16
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] LSAT結晶の規則・不規則ドメイン構造2014

    • Author(s)
      岡田 俊介,佐々木 勝寛,徳永 智春,小林 俊介,山本 剛久
    • Organizer
      日本顕微鏡学会第70回記念学術講演会
    • Place of Presentation
      東京 幕張メッセ
    • Year and Date
      2014-05-11 – 2014-05-13
    • Related Report
      2014 Annual Research Report
  • [Presentation] チタン酸バリウムのフラッシュ焼結2014

    • Author(s)
      上橋彰教、佐々木勝寛、徳永智春、山本剛久、吉田英弘
    • Organizer
      日本顕微鏡学会第70回記念学術講演会
    • Place of Presentation
      東京 幕張メッセ
    • Year and Date
      2014-05-11 – 2014-05-13
    • Related Report
      2014 Annual Research Report
  • [Presentation] Domain structure of LSAT Single Crystal2014

    • Author(s)
      S. Okada, K. Sasaki, T. Tokunaga, S. Kobayashi, T. Yamamoto
    • Organizer
      The 4th International Symposium on Advanced Microscopy and Theoretical Calculations (AMTC4)
    • Place of Presentation
      浜松 アクトシティ浜松
    • Year and Date
      2014-05-08 – 2014-05-10
    • Related Report
      2014 Annual Research Report
  • [Presentation] Yttrium Segregation Behavior to Necks during Sinterring in Alumina Doped with Yttria2014

    • Author(s)
      T. Sako, T. Tokunaga, K. Sasaki, H. Yoshida, T. Yamamoto
    • Organizer
      The 4th International Symposium on Advanced Microscopy and Theoretical Calculations (AMTC4)
    • Place of Presentation
      浜松 アクトシティ浜松
    • Year and Date
      2014-05-08 – 2014-05-10
    • Related Report
      2014 Annual Research Report
  • [Presentation] Mechanism for the Precipitation of Carbon on the Surface of Ni Catalyst2014

    • Author(s)
      T. Tokunaga, H. Tasugi, N. Iwamoto, K. Sasaki, T. Yamamoto
    • Organizer
      The 4th International Symposium on Advanced Microscopy and Theoretical Calculations (AMTC4)
    • Place of Presentation
      浜松 アクトシティ浜松
    • Year and Date
      2014-05-08 – 2014-05-10
    • Related Report
      2014 Annual Research Report

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Published: 2014-04-04   Modified: 2018-03-22  

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