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The clarified origin of the excess thermodynamic functions by XAFS

Research Project

Project/Area Number 20K22464
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0401:Materials engineering, chemical engineering, and related fields
Research InstitutionTokyo Institute of Technology

Principal Investigator

Watanabe Manabu  東京工業大学, 物質理工学院, 助教 (50880283)

Project Period (FY) 2020-09-11 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsXAFS / Levitation / 規則ー不規則合金 / 電磁浮遊法 / 静電浮遊法 / 規則ー不規則変態 / 蛍光XAFS / 電子状態 / 構造 / 電子物性 / 溶融金属 / XAFS
Outline of Research at the Start

本研究では、X線吸収微細構造分析(XAFS)により、電子構造および内部構造を解明し溶融規則―不規則変態合金の過剰量の起源を解明することを目的とする。過剰量XEは、溶液における物理量Xの理想溶液からの尺度である。我々は、過剰ギブズエネルギーを用いて過剰体積を整理した。その結果、従来の溶液論(正の相関)に従う合金の他に、規則―不規則変態を生ずる合金系では負の相関を生じ、さらに、負の相関は電子数に従うことを明らかにした。本研究では、この相関を解明する為、新たなアプローチとして、電子状態および内部構造の観点から考察することにより、新たな金属溶液論を構築することを目的とする。

Outline of Final Research Achievements

XAFS measurements of Fe-Pd alloys were performed at BL01BU of the Japan Synchrotron Radiation Research Center "SPring-8" in order to clarify the origin of the thermodynamic and thermophysical excesses functions of molten metals. We were able to maintain the molten state using the gas floating jet furnace owned by SPring-8. XAFS measurements of the K-edge of Pd were successful in both solid and liquid states, however, the measurement of Fe was difficult due to the absorption of Ar gas used for floating sample. Therefore, we reexamined the inert gas for XAFS measurement and measured the thermophysical properties of the order-random transformation.

Academic Significance and Societal Importance of the Research Achievements

本研究では、規則ー不規則変態を生じる合金の溶融状態の過剰体積と過剰ギブズエネルギーとの間の負の依存性について、高輝度光科学研究センターSPring-8にてXAFS測定および浮遊法により熱物性測定を行った。XAFS測定では電子状態と構造情報の取得を目的に研究を行った。浮遊法を用いた熱物性測定は順調に行うことができ、溶融Fe-Pd、Ni-Ti合金、Au系合金などの密度、放射率、熱容量、熱伝導率および粘性測定を行うことができ、これらの物性値から過剰量との相関性について議論し、新たな溶液モデルの提唱に成功した。このような溶液モデルは、従来報告がなく学術的意味がある。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (8 results)

All 2023 2022 2021

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (4 results) (of which Int'l Joint Research: 1 results,  Invited: 3 results)

  • [Journal Article] Normal spectral emissivity and heat capacity of Pd-Fe melts measured at constant pressure under electromagnetic levitation with a static magnetic field2023

    • Author(s)
      Manabu Watanabe, Masayoshi Adachi, Masahito Uchikoshi, Hiroyuki Fukuyama
    • Journal Title

      High temperatures-High pressures

      Volume: in press

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Densities of Au-X (X=Cu, Ni and Pd) binary melts and thermodynamic correlations2022

    • Author(s)
      Watanabe Manabu、Adachi Masayoshi、Fukuyama Hiroyuki
    • Journal Title

      Journal of Molecular Liquids

      Volume: 348 Pages: 118050-118050

    • DOI

      10.1016/j.molliq.2021.118050

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Density and viscosity of Ni-Ti melts measured by an electrostatic levitation technique2022

    • Author(s)
      WATANABE Manabu、KOYAMA Chihiro、WATANABE Yuki、ISHIKAWA Takehiko
    • Journal Title

      International Journal of Heat and Mass Transfer

      Volume: 198 Pages: 123435-123435

    • DOI

      10.1016/j.ijheatmasstransfer.2022.123435

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Heat capacities and thermal conductivities of palladium and titanium melts and correlation between thermal diffusivity and density of states for transition metals in a liquid state2021

    • Author(s)
      Watanabe Manabu、Adachi Masayoshi、Fukuyama Hiroyuki
    • Journal Title

      Journal of Molecular Liquids

      Volume: 324 Pages: 115138-115138

    • DOI

      10.1016/j.molliq.2020.115138

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 熱力学過剰量に基づいた新たな金属溶液論の展開2023

    • Author(s)
      渡邉学
    • Organizer
      2023年春季(第185回)日本鉄鋼協会講演大会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 溶融状態における規則―不規則合金系の過剰関数の検討2023

    • Author(s)
      渡邉学
    • Organizer
      高温物性値フォーラム
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 熱力学過剰量に基づく新たな金属溶液論の展開2022

    • Author(s)
      渡邉学
    • Organizer
      2022年秋期(第171回)日本金属学会講演大会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Thermophysical property measurements of Ti melt using EML with a static magnetic field2022

    • Author(s)
      Manabu Watanabe, Masayoshi Adachi, Hiroyuki Fukuyama
    • Organizer
      the 13th Asian Thermophysical Properties Conference, ATPC2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research

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Published: 2020-09-29   Modified: 2024-01-30  

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