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Phonon scattering behavior at metal/insulator phase transition interfaces

Research Project

Project/Area Number 21K14092
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 19020:Thermal engineering-related
Research InstitutionNagaoka University of Technology

Principal Investigator

Baba Masaaki  長岡技術科学大学, 工学研究科, 助教 (10826176)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords金属ー絶縁体相転移 / 金属―絶縁体相転移材料 / 熱制御
Outline of Research at the Start

本研究の目的は,金属/絶縁相転移界面におけるフォノン挙動(伝熱特性)の解明である.二酸化バナジウム(VO2)は,室温付近で金属―絶縁体相転移をする材料であり,相転移前後で結晶構造が変化し,熱・電気物性が大きく変化する.我々はこれまでの研究で「VO2は材料内部に金属相と絶縁体相の界面がある時に熱伝導率が低下する」という現象を観察している.この現象は,金属/絶縁体界面におけるフォノン散乱(熱輸送の阻害)に起因していると考えられる.そこで本研究では,界面熱抵抗の測定を通して金属/絶縁体界面におけるフォノン散乱挙動を分析し,この現象を用いた熱制御素子の実現可能性を検討する.

Outline of Final Research Achievements

This study focuses on the phonon scattering behavior at metal/insulator interfaces. To achieve this, I established thin-film deposition techniques for VO2 and W-doped VO2 (W-VO2), and measured the thermophysical properties of bulk VO2. VO2 films deposited by sputtering method exhibited a resistance change of over three orders of magnitude. Furthermore, the phase transition temperature of the deposited W-VO2 was lower than that of pure VO2, indicating that the phase transition temperature can be controlled through W doping. I fabricated VO2 sintered bodies with a relative density exceeding 95% of the theoretical density. By measuring the latent heat, specific heat, and thermal conductivity of these sintered bodies, the thermophysical properties of the single-phase VO2 were clarified.

Academic Significance and Societal Importance of the Research Achievements

本研究で用いた成膜手法は,スパッタリング法によりアモロファス相のVO2を成膜し,熱処理によって結晶化させる手法である.この手法は,大面積の成膜が可能,成膜時に酸素の調整が不要,基板の加熱が不要という利点があり,他の成膜手法と比べて工業的に有利である.本研究では,この成膜手法で未知であった熱処理条件と膜の物性との関係を明らかにし,MITに伴う抵抗変化が大きいVO2膜を作製できる条件を明らかにした.この成果は,VO2膜を用いたデバイスの製品化に貢献すると考えられる.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (7 results)

All 2024 2023 2022 2021

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (5 results)

  • [Journal Article] Temperature-leveling performance comparison of solid–solid phase change materials for thermal management of electronic chips in thin devices2024

    • Author(s)
      Masaaki Baba、Hiroaki Ishiharajima、Koki Ishisaka、Noboru Yamada、Masatoshi Takeda
    • Journal Title

      Journal of Thermal Science and Technology

      Volume: 19 Issue: 1 Pages: 24-00014-24-00014

    • DOI

      10.1299/jtst.24-00014

    • ISSN
      1880-5566
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Output power leveling of on-chip thermoelectric generator using a solid?solid phase change material2022

    • Author(s)
      Nemoto Kosei、Takeuchi Ryosei、Baba Masaaki、Takeda Masatoshi、Yamada Noboru
    • Journal Title

      Journal of Energy Storage

      Volume: 56 Pages: 106119-106119

    • DOI

      10.1016/j.est.2022.106119

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] 電子機器の熱マネジメントに用いる固―固相変化材料の性能評価2023

    • Author(s)
      馬場将亮,石原島弘明,石坂洸樹,武田雅敏
    • Organizer
      第 60 回日本伝熱シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] スパッタ法で成膜した結晶VO2薄膜の物性に及ぼす熱処理条件の影響2023

    • Author(s)
      杉浦史生,馬場将亮,篠原維月,畑山祥吾,齊藤雄太,内田紀行,武田雅敏
    • Organizer
      日本金属学会2023年秋季講演大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] スパッタ法で成膜したVO2薄膜の物性に及ぼすWドープの影響2022

    • Author(s)
      石原島弘明,馬場将亮,畑山祥吾,齊藤雄太,内田紀行,武田雅敏
    • Organizer
      日本金属学会2022年秋季講演大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Crystallization behavior of sputter-grown amorphous VO2 thin films and the effects of W doping on physical properties2022

    • Author(s)
      H. Ishiharajima, M. Baba, S. Hatayama, Y. Saito, N. Uchida, M. Takeda
    • Organizer
      第33回 相変化研究会シンポジウム
    • Related Report
      2022 Research-status Report
  • [Presentation] 金属-絶縁体相転移材料VO2の熱電特性評価2021

    • Author(s)
      酒井諒二,馬場将亮,武田雅敏
    • Organizer
      日本金属学会2021年秋季講演大会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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