Covalency of Valence Electrons in Liquid Silicon: A Direct X-ray Compton Scattering Measurement

• Project/Area Number: 20760504
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Metal making engineering
• Research Institution: Japan Aerospace Exploration Agency
• Principal Investigator: OKADA Junpei Japan Aerospace Exploration Agency, 宇宙科学研究本部, 助教 (90373282)
• Project Period (FY): 2008 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2009: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2008: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 融体 / 凝固 / 電子構造 / シリコン / コンプトン散乱測定 / 静電浮遊法 / コンプトン散乱 / 静電浮遊 / 電子運動量密度分布 / 共有結合

Research Abstract

We have measured a Compton profile of liquid silicon with an electrostatic levitator and found that the Compton profile is much the same as that of solid silicon. Despite its metallic nature, the obtained Compton profile is largely different from that of an interacting free-electron gas with the same valence-electron density. Analysis of the Compton profile of liquid Si using Car-Parrinello Molecular Dynamics simulation shows the existence of covalent bonds in liquid silicon, which has been predicted by first-principles molecular dynamics simulation.

Research Products

• [Journal Article] Viscosity of liquid boron (2010)
  • Author(s): J.T.Okada, T.Ishikawa, Y.Watanabe, P.-F.Paradis, K.Kimura
  • Journal Title: Physical Review B 81,140201R Pages: 4-4
  • Peer Reviewed
• [Journal Article] Surface tension and viscosity of molten vanadium measured with an electrostatic levitation furnace (2010)
  • Author(s): J.T.Okada, T.Ishikawa, Y.Watanabe, P.F.Paradis
  • Journal Title: Journal of Chemical Thermodynamics 42 Pages: 856-859
  • Peer Reviewed
• [Journal Article] Quasicrystalline Tenfold Symmetry Order in Boron Compounds (2010)
  • Author(s): Y.Miyazaki, J.Okada, E.Abe, Y.Yokoyama, K.Kimura
  • Journal Title: Journal of the Physical Society of Japan 79,073601 Pages: 4-4
  • NAID: 40017205428
  • Peer Reviewed
• [Journal Article] Supercooling of Homogeneous Liquid Phase of Liquid Metals and Alloys -Poor Supercooling around the Eutectic Composition of Liquid Ni-Nb System (2010)
  • Author(s): T.Itami, J.Okada, ., Y.Watanabe, T.Ishikawa, S.Yoda
  • Journal Title: Materials Transactions 51 Pages: 1510-1515
  • NAID: 120006832438
  • Peer Reviewed
• [Journal Article] Thermophysical Property Measurements of Liquid Gadolinium by Containerless Methods (2010)
  • Author(s): T.Ishikawa, J.T.Okada, P.F.Paradis, Y.Watanabe
  • Journal Title: International Journal of Thermophysics 31 Pages: 388-398
  • Peer Reviewed
• [Journal Article] Viscosity of liquid boron (2010)
  • Author(s): Junpei. T.Okada, T.Ishikawa, et al.
  • Journal Title: Physical Review B 81
  • Peer Reviewed
• [Journal Article] Surface tension and viscosity of molten vanadium measured with an electrostatic levitation furnace (2010)
  • Author(s): Junpei T.Okada, T.Ishikawa, et al.
  • Journal Title: The Journal of Chemical Thermodynamics (in press)
  • Peer Reviewed
• [Journal Article] Volume and viscosity of Zr-Cu-Al glass-forming liquid alloys (2009)
  • Author(s): Y.Yokoyama, T.Ishikawa, J.T.Okada, S.Nanao, A.Inoue.
  • Journal Title: J.Non-Crystal.Solids 355 Pages: 317-322
  • Peer Reviewed
• [Journal Article] Noncontact thermophysical property measurement of liquid cerium by electrostatic levitation (2009)
  • Author(s): J.Q.Li, T.Ishikawa, J.T.Okada, S.yoda.
  • Journal Title: J.MAT.RES. 24 Pages: 2449-2452
  • Peer Reviewed
• [Journal Article] Covalency of Valence Electrons in Liquid Silicon : A Direct X-ray Compton Scattering Measurement
  • Author(s): J.T.Okada, P.-L.Sit, Y.Watanabe, Takehiko Ishikawa, B.Barbiellini, A.Bansil, R.Wan, T.Masaki, P.-F.Paradis, M.Itou, Y.Sakurai, K.Kimura, Tetsuya Ishikawa, S.Nanao
  • Journal Title: submitted.
  • Peer Reviewed
• [Presentation] コンプトン散乱測定による液体シリコンの電子運動量密度分布の決定-共有結合性の検証- (2011)
  • Author(s): 岡田純平, P.-L.Sit, 渡辺康裕B, 石川毅彦, B.Barbiellini, A.Bansil, R.Wan, 正木匡彦, 伊藤真義, 櫻井吉晴, 木村薫, 七尾進
  • Organizer: 日本物理学会
  • Place of Presentation: 新潟
  • Year and Date: 2011-03-25
• [Presentation] Thermophysical property measurements of high temperature melts using an electrostatic levitation method (2010)
  • Author(s): T.Ishikawa, J.T.Okada, P.-F.Paradis, Y.Watanabe
  • Organizer: 2nd International symposium on thermal design and thermophysical property for electronics and energy, Invited talk
  • Place of Presentation: つくば
  • Year and Date: 2010-12-17
• [Presentation] 静電浮遊法による高温融体の熱物性測定 (2010)
  • Author(s): 石川毅彦、岡田純平、P.-F.Paradis, 渡邊勇基
  • Organizer: 第31回日本熱物性シンポジウム
  • Place of Presentation: 福岡
  • Year and Date: 2010-11-17
• [Presentation] Electrostatic Levitation Technique for Investigations of Physical Properties of Liquid States (2010)
  • Author(s): J.T.Okada, T.Ishikawa, P.-F.Paradis, S.Yoda
  • Organizer: 38th COSPAR Scientific Assembly
  • Place of Presentation: ドイツハンブルグ
  • Year and Date: 2010-07-24
• [Presentation] クラスター液体の構造と物性-正20面体準結晶と正20面体ボロン- (2009)
  • Author(s): 岡田純平
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-26
• [Presentation] クラスタ-液体の構造と物性-正20面体準結晶と正20面体ボロン- (2009)
  • Author(s): 岡田純平
  • Organizer: 日本物理学会シンポジウム招待講演
  • Place of Presentation: 熊本
  • Year and Date: 2009-09-25
• [Presentation] 静電浮遊法を用いた熔融ゲルマニウムのコンプトン散乱測定 (2008)
  • Author(s): 岡田純平、石川毅彦、依田真一、濱石光洋、渡辺康裕、木村薫、七尾進、伊藤真義、櫻井吉晴
  • Organizer: 日本金属学会
  • Place of Presentation: 熊本
  • Year and Date: 2008-09-23
• [Remarks]
  • URL: http://www.isas.jaxa.jp/home/iss/ISS_science_project_office.files/html_file/ishikawa/IshikawaLab.htm