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Development of novel actuator materials by control of rare earth 4f electron number

Research Project

Project/Area Number 18K19019
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 29:Applied condensed matter physics and related fields
Research InstitutionNagoya University

Principal Investigator

Takenaka Koshi  名古屋大学, 工学研究科, 教授 (60283454)

Project Period (FY) 2018-06-29 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2018: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Keywordsアクチュエータ / 硫化サマリウム / 価数揺動 / 金属絶縁体転移 / 体積変化 / 負熱膨張
Outline of Final Research Achievements

Sintered bodies of SmS containing various dopants (Y, Ce, Nd, etc.) has been successfully grown by an original method, which is a solid-phase reaction method that enables growth at low temperature and in a short time compared with the conventional method. It was found that these sintered bodies develop a large isotropic negative thermal expansion from a higher temperature than previously reported. Moreover, the difference in the temperature at which the valence transition occurs between the pressure-induced and element-substituted cases was explained from the viewpoint of the electronic state by reflectivity spectroscopy using the single crystals. Furthermore, the system that enables simultaneous measurement of nonlinear conduction and strain induced by an electric field was constructed. Using this system, direct measurement of the strain associated with the valence transition by the electric field was verified for the first time for SmS.

Academic Significance and Societal Importance of the Research Achievements

「価数揺動」という、基礎物理学の概念を活用し、負熱膨張や体積変化アクチュエータといった、革新的な体積機能を創出する基礎を築いた点で、画期的である。鉛フリーのアクチュエータ材料創出につながるもので、材料学分野に大きな波及効果をもたらすと期待される。
精密な反射分光測定により、Sm1-xRxS系の伝導状態の特異性を示すことができた。この知見は、長い研究の歴史を有する価数揺動の研究でもこれまで明確に意識されてこなかったものであり、価数揺動の理解に貢献するものと考えられる。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (11 results)

All 2020 2019 2018

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 1 results,  Invited: 5 results)

  • [Journal Article] Effects of Y substitution on the electronic structure and charge dynamics of SmS2019

    • Author(s)
      Yokoyama Y.、Hasegawa H.、Mizuno Y.、Asai D.、Okamoto Y.、Suzuki H. S.、Takehana K.、Imanaka Y.、Takenaka K.
    • Journal Title

      Physical Review B

      Volume: 100 Issue: 24

    • DOI

      10.1103/physrevb.100.245143

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Valence fluctuations and giant isotropic negative thermal expansion in Sm1-xRxS (R=Y, La, Ce, Pr, Nd)2019

    • Author(s)
      D. Asai, Y. Mizuno, H. Hasegawa, Y. Yokoyama, Y. Okamoto, N. Katayama, H. S. Suzuki, Y. Imanaka, and K. Takenaka
    • Journal Title

      Applied Physics Letters

      Volume: 114 Issue: 14

    • DOI

      10.1063/1.5090546

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Giant isotropic negative thermal expansion in Y-doped samarium monosulfides by intra-atomic charge transfer2019

    • Author(s)
      K. Takenaka, A. Asai, R. Kaizu, Y. Mizuno, Y. Yokoyama, Y. Okamoto, N. Katayama, H. S. Suzuki, and Y. Imanaka
    • Journal Title

      Scientific Reports

      Volume: 9 Issue: 1

    • DOI

      10.1038/s41598-018-36568-w

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Sm1-xRxS (R=Y, Ce, Nd)の電子状態と電荷ダイナミクス2020

    • Author(s)
      長谷川遥加、水野陽介、横山泰範、岡本佳比古、鈴木博之、竹端寛治、今中康貴、竹中康司
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Fine particles showing giant negative thermal expansion2019

    • Author(s)
      K. Takenaka
    • Organizer
      3rd International Symposium on Negative Thermal Expansion and Related Materials
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 負熱膨張性微粒子による電子デバイスのサーマル・マネジメント2019

    • Author(s)
      竹中康司
    • Organizer
      粉体粉末冶金協会令和元年度秋季大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Sm1-xRxS(R:希土類元素)における価数揺動と体積変化機能2019

    • Author(s)
      水野陽介、長谷川遥加、浅井大悟、横山泰範、岡本佳比古、片山尚幸、鈴木博之、今中康隆、竹中康司
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 負熱膨張性微粒子による電子デバイスのサーマル・マネジメント2019

    • Author(s)
      竹中康司
    • Organizer
      ニューセラミックス懇話会第238回研究会「セラミックス材料の新規合成法」
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 巨大負熱膨張材料による熱膨張制御2018

    • Author(s)
      竹中康司
    • Organizer
      日本金属学会2018年秋期(第163回)講演大会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] 巨大負熱膨張材料による熱膨張制御2018

    • Author(s)
      竹中康司
    • Organizer
      日本セラミックス協会第31回秋季シンポジウム
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Sm1-xRxS (R : Y, Ce, Nd) の負熱膨張特性2018

    • Author(s)
      浅井 大悟, 竹中 康司 他
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Research-status Report

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Published: 2018-07-25   Modified: 2021-12-27  

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