Experimental study of gravitational instability using high power laser: Implication to early Earth differentiation

• Project/Area Number: 26610141
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Solid earth and planetary physics
• Research Institution: Osaka University
• Principal Investigator: Terasaki Hidenori 大阪大学, 理学(系)研究科(研究院), 准教授 (50374898)
• Co-Investigator(Renkei-kenkyūsha): SAKAIYA Tatsuhiro 大阪大学, 大学院理学研究科, 助教 (60452421)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 惑星核形成 / 重力不安定 / 鉄合金 / レーザー衝撃実験 / 核ーマントル分離 / 中心核 / 初期地球 / 核形成 / 衝撃圧縮 / 液体 / レーザー

Outline of Final Research Achievements

In order to clarify the core/mantle differentiation process controlled by gravitational instability, we have carried out in situ observation of gravitational instability of Fe-alloy under high pressure and temperature. By adding gravity to the sample using high power laser (GEKKO-XII), a surface perturbation of the sample was measured based on X-ray absorption imaging. It is found that an amplitude of the perturbation increased with time and that growth rate of the perturbation changed depending on the sample composition and existence of silicate layer on the sample. In this study, we successfully measured the perturbation growth of Fe-alloy samples caused by gravitational instability. The obtained results give us important information regarding terrestrial core formation mechanism and its time scale.

Research Products

• [Journal Article] Sound velocity and elastic properties of Fe-Ni and Fe-Ni-C liquids at high pressure (2016)
  • Author(s): Soma Kuwabara, Hidenori Terasaki, Keisuke Nishida, Yuta Shimoyama, Yusaku Takubo, Yuji Higo, Yuki Shibazaki, Satoru Urakawa, Kentaro Uesugi, Akihisa Takeuchi, Tadashi Kondo
  • Journal Title: Physics and Chemistry of Minerals Volume: 43 Issue: 3 Pages: 229-236
  • DOI: 10.1007/s00269-015-0789-y
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Compressional and shear wave velocities for polycrystalline bcc-Fe up to 6.3 GPa and 800 K (2016)
  • Author(s): Shibazaki, Y., K. Nishida, Y. Higo, M. Igarashi, M. Tahara, T. Sakamaki, H. Terasaki, Y. Shimoyama, S. Kuwabara, Y. Takubo, E. Ohtani
  • Journal Title: American Mineralogist Volume: -
  • Peer Reviewed
• [Journal Article] Density and Thermoelastic Properties of Liquid Fe-FeO at High Pressure (2016)
  • Author(s): Takubo Y., H. Terasaki, Y. Shimoyama, S. Kuwabara, S. Urakawa, T. Kondo, A. Suzuki, K. Nishida, E. Ohtani, T. Watanuki, Y. Katayama
  • Journal Title: SPring-8 Section A: Scientific Research Report Volume: 4 Pages: 53-57
  • Peer Reviewed
• [Journal Article] Mitigation of Laser Imprinting with Diamond Ablator for Direct-Drive Inertial Confinement Fusion Targets (2016)
  • Author(s): K. Shigemori, H. Kato, M. Nakai, R. Hosogi, T. Sakaiya, H. Terasaki, S. Fujioka, A. Sunahara, H. Azechi
  • Journal Title: Journal of Physics: Conference Series Volume: 688 Pages: 012107-012107
  • DOI: 10.1088/1742-6596/688/1/012107
  • Peer Reviewed
• [Journal Article] Physical properties of the outer core (2015)
  • Author(s): Terasaki, H.
  • Journal Title: In Deep Earth: Physics and Chemistry of the Lower Mantle and Core (Eds. H. Terasaki, R. Fischer), AGU monograph series Volume: 印刷中
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Repulsive Nature for Hydrogen Incorporation to Fe₃C up to 14 GPa (2014)
  • Author(s): Terasaki H., Shibazaki Y., Nishida K., Tateyama R., Takahashi S., Ishii M., Shimoyama Y., Ohtani E., Funakoshi K., Higo Y.
  • Journal Title: ISIJ International Volume: 54 Issue: 11 Pages: 2637-2642
  • DOI: 10.2355/isijinternational.54.2637
  • NAID: 130004705014
  • ISSN: 0915-1559, 1347-5460
  • Peer Reviewed / Open Access
• [Journal Article] High-pressure and high-temperature phase diagram for Fe0.9Ni0.1-Halloy (2014)
  • Author(s): Shibazaki Y., Terasaki H., Ohtani E., Tateyama R., Nishida K., Funakoshi K., Higo Y.
  • Journal Title: Physics of the Earth and Planetary Interiors Volume: 228 Pages: 192-201
  • DOI: 10.1016/j.pepi.2013.12.013
  • Peer Reviewed
• [Journal Article] Equation of state of Fe3S at room temperature up to 2 megabars (2014)
  • Author(s): Kamada S., Ohtani E., Terasaki H., Sakai T., Takahashi S., Hirao N., Ohishi Y.
  • Journal Title: Physics of the Earth and Planetary Interiors Volume: 228 Pages: 106-113
  • DOI: 10.1016/j.pepi.2013.11.001
  • Peer Reviewed
• [Journal Article] The sound velocity measurements of Fe3S (2014)
  • Author(s): eiji Kamada, Eiji Ohtani, Hiroshi Fukui, Takeshi Sakai, Hidenori Terasaki, Suguru Takahashi, Yuki Shibazaki, Satoshi Tsutsui, Alfred Q. R. Baron, Naohisa Hirao, Yasuo Ohishi
  • Journal Title: American Mineralogist Volume: 99 Issue: 1 Pages: 98-101
  • DOI: 10.2138/am.2014.4463
  • Peer Reviewed
• [Presentation] The effects of pressure and alloying Ni and C on sound velocity of liquid Fe-alloys (2015)
  • Author(s): Hidenori Terasaki, Soma Kuwabara, Keisuke Nishida, Yuta Shimoyama, Yusaku Takubo, Yuji Higo, Yuki Shibazaki, Satoru Urakawa, Tadashi Kondo
  • Organizer: American Geophysical Union 2015 Fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2015-12-14
  • Int'l Joint Research
• [Presentation] Thermal elastic properties of liquid Fe-C at high pressure (2015)
  • Author(s): Yuta Shimoyama, Hidenori Terasaki, Satoru Urakawa, Yusaka Takubo, Tetsu Watanuki, Yoshinori Katayama, Tadashi Kondo
  • Organizer: American Geophysical Union 2015 Fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2015-12-14
  • Int'l Joint Research
• [Presentation] Fe-NiおよびFe-Ni-C融体の音速の圧力依存性 (2015)
  • Author(s): 寺崎 英紀,桑原 荘馬,下山 裕太,西田 圭佑,肥後 祐司,田窪 勇作,柴崎 裕樹,浦川 啓,近藤 忠
  • Organizer: 日本高圧討論会
  • Place of Presentation: 広島
  • Year and Date: 2015-11-10
• [Presentation] Ｘ線マイクロＣＴを用いた高圧下の液体物性測定 (2015)
  • Author(s): 浦川 啓,寺崎英紀,桑原荘馬,田窪勇作,下山裕太,岸本俊八
  • Organizer: 日本高圧討論会
  • Place of Presentation: 広島
  • Year and Date: 2015-11-10
• [Presentation] Melting relationships of the Fe-light element systems under high pressures (2015)
  • Author(s): Seiji Kamada, Takanori Sakairi, Akihiro Takahata, Kota Kobayashi, Hiroto Takada, Suguru Takahashi, Hidenori Terasaki, Eiji Ohtani, Naohisa Hirao, Yasuo Ohishi
  • Organizer: 日本高圧討論会
  • Place of Presentation: 広島
  • Year and Date: 2015-11-10
• [Presentation] 外熱式DACを用いたX線イメージング吸収法によるInの密度測定 (2015)
  • Author(s): 田窪勇作，寺崎英紀, 近藤忠，三田井慎吾，亀卦川卓美
  • Organizer: 日本高圧討論会
  • Place of Presentation: 広島
  • Year and Date: 2015-11-10
• [Presentation] Fe-C系融体の密度-音速 同時測定による熱弾性的性質 の解明 (2015)
  • Author(s): 下山裕太,寺崎英紀,浦川啓,田窪勇作,岸本俊八,近藤忠,綿貫徹,片山芳則
  • Organizer: 日本高圧討論会
  • Place of Presentation: 広島
  • Year and Date: 2015-11-10
• [Presentation] 高温高圧下におけるFe-S-O-H系の反応関係 (2015)
  • Author(s): 三田井慎吾，近藤忠，田窪勇作，寺崎英紀, 山下智也，亀卦川卓美
  • Organizer: 日本高圧討論会
  • Place of Presentation: 広島
  • Year and Date: 2015-11-10
• [Presentation] 超音波法を用いた高温高圧下での固体鉄の弾性波速度・密度測定 (2015)
  • Author(s): 柴崎 裕樹, 西田 圭佑, 肥後 祐司, 五十嵐 愛子, 田原 政紀, 坂巻 竜也, 寺崎 英紀, 下山 裕太, 田窪 勇作, 桑原 荘馬, 大谷 栄治
  • Organizer: 日本高圧討論会
  • Place of Presentation: 広島
  • Year and Date: 2015-11-10
• [Presentation] Development of sound velocity and density measurement for liquid Fe-alloys using multi-anvil apparatus up to 11 GPa (2015)
  • Author(s): Hidenori Terasaki,Yuta Shimoyama, Yusaku Takubo, Soma Kuwabara, Keisuke Nishida, Yuji Higo, Satoru Urakawa, Shunpachi Kishimoto,Yuki Shibazaki, Tatsuya Sakamaki, Masaki Tahara, Mako Igarashi, Tetsu Watanuki, Akihiko Machida, Yoshinori Tange, Yoshinori Katayama, Tadashi Kondo
  • Organizer: Joint AIRAPT-25 & EHPRG-53 (International conference on High pressure science and technology)
  • Place of Presentation: Madrid, Spain
  • Year and Date: 2015-08-30
  • Int'l Joint Research
• [Presentation] Density measurement of indium using X-ray imaging absorption combined with external heated diamond anvil cell (2015)
  • Author(s): Yusaku Takubo, Hidenori Terasaki, Tadashi Kondo, Shingo Mitai, Takumi Kikegawa
  • Organizer: Joint AIRAPT-25 & EHPRG-53 (International conference on High pressure science and technology)
  • Place of Presentation: Madrid, Spain
  • Year and Date: 2015-08-30
  • Int'l Joint Research
• [Presentation] Density and sound velocity of liquid Fe-alloys under high pressure: Implication for Mercury core (2015)
  • Author(s): Hidenori Terasaki, Yuta Shimoyama, Soma Kuwabara, Yusaku Takubo, Satoru Urakawa, Shun-pachi Kishimoto, Tetsu Watanuki, Akihiko Machida, Yoshinori Katayama, Tadashi Kondo, Sho Sasaki
  • Organizer: Messenger-BepiColombo Joint Science Meeting
  • Place of Presentation: Berlin, Germany
  • Year and Date: 2015-06-16
  • Int'l Joint Research
• [Presentation] The effect of Ni and C on sound velocity of liquid Fe at high pressure (2015)
  • Author(s): Kuwabara Soma, Terasaki Hidenori, Shimoyama Yuta, Nishida Keisuke, Higo Yuji, Takubo Yusaku, Shibazaki Yuki, Tahara Masaki, Igarashi Mako, Sakamaki Tatsuya, Tange Yoshinori, Kondo Tadashi
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ、千葉
  • Year and Date: 2015-05-24
• [Presentation] 地球核条件下にレーザー衝撃圧縮されたFe-Si合金の音速 (2015)
  • Author(s): 境家 達弘, 細木 亮太, 近藤 忠, 寺崎 英紀, 重森 啓介, 弘中 陽一郎
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ、千葉
  • Year and Date: 2015-05-24
• [Presentation] Sound velocity measurements of solid iron under high pressure and high temperature using an ultrasonic method (2015)
  • Author(s): 柴崎 裕樹, 西田 圭佑, 肥後 祐司, 五十嵐 愛子, 田原 政紀, 坂巻 竜也, 寺崎 英紀, 下山 裕太, 桑原 荘馬, 田窪 勇作, 大谷 栄治
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ、千葉
  • Year and Date: 2015-05-24
• [Presentation] Sound velocity and density of liquid Fe-Ni-Si under pressure: Application to the composition of planetary molten core (2014)
  • Author(s): Terasaki, H., S. Kuwabara, Y. Shimoyama, Y. Takubo, S. Urakawa, K. Nishida, A. Takeuchi, Y. Suzuki, K. Uesugi, Y. Higo, T. Watanuki, Y. Katayama, T. Kondo
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2014-12-15 – 2014-12-19
• [Presentation] Simultaneous measurement of density and sound velocity of liquid Fe-C at high pressure (2014)
  • Author(s): Y. Shimoyama, H. Terasaki, Y. Takubo, S. Urakawa, S. Kuwabara, Y. Katayama
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2014-12-15 – 2014-12-19
• [Presentation] 地球型惑星の中心核形成プロセス (2014)
  • Author(s): 寺崎英紀、境家達弘、秋本耕作、細木亮太、重森啓介、加藤弘樹、近藤忠
  • Organizer: 第55回高圧討論会
  • Place of Presentation: 徳島大学、徳島
  • Year and Date: 2014-11-22 – 2014-11-24
  • Invited
• [Presentation] 超音波法及びX線CTを用いた高圧下におけるFe-Ni-C及びFe-Ni融体の音速、密度の同時測定 (2014)
  • Author(s): 桑原荘馬、寺崎英紀、西田圭佑、下山裕太、肥後祐司、田窪勇作、浦川啓、鈴木芳生、竹内晃久、上杉健太朗、近藤忠
  • Organizer: 第55回高圧討論会
  • Place of Presentation: 徳島大学、徳島
  • Year and Date: 2014-11-22 – 2014-11-24
• [Presentation] レーザー衝撃圧縮法によるFeSi融体中を伝わる音速の測定 (2014)
  • Author(s): 細木亮太、境家達弘、横山直也、近藤忠、寺崎英紀、重森啓介、弘中陽一郎
  • Organizer: 第55回高圧討論会
  • Place of Presentation: 徳島大学、徳島
  • Year and Date: 2014-11-22 – 2014-11-24
• [Presentation] 物質の硬さに着眼したレーザー核融合ターゲットの設計 (2014)
  • Author(s): 重森啓介、加藤弘樹、中井光男、境家達弘、寺崎英紀、弘中陽一郎、藤岡慎介、砂原淳、清水克哉、畦地宏
  • Organizer: 第55回高圧討論会
  • Place of Presentation: 徳島大学、徳島
  • Year and Date: 2014-11-22 – 2014-11-24
• [Presentation] X線CTと超音波法を用いた合金融体の弾性特性測定 (2014)
  • Author(s): 寺崎英紀、桑原荘馬、下山裕太、田窪勇作、浦川啓、西田圭佑、鈴木芳生、竹内晃久、上杉健太朗、肥後祐司、片山芳則、綿貫徹、近藤忠
  • Organizer: SPring-8 高圧物質科学研究会・地球惑星科学研究会合同研究会
  • Place of Presentation: 東京大学、東京
  • Year and Date: 2014-09-14
  • Invited
• [Presentation] 鉄合金融体の音速・密度に与える軽元素の効果：惑星外核の組成解明に向けて (2014)
  • Author(s): 寺崎英紀、桑原荘馬、下山裕太、田窪勇作、浦川啓、西田圭佑、鈴木芳生、竹内晃久、上杉健太朗、肥後祐司、片山芳則、近藤忠
  • Organizer: 月・火星・水星内部研究会
  • Place of Presentation: 大阪大学、大阪
  • Year and Date: 2014-09-08 – 2014-09-09
• [Presentation] 高温高圧下におけるFe-Sメルトの音速測定精度の現状 (2014)
  • Author(s): 西田圭佑、寺崎英紀、鈴木昭夫、若林大佑、柴崎裕樹、桑原荘馬、下山裕太、肥後祐司、船守展正
  • Organizer: 月・火星・水星内部研究会
  • Place of Presentation: 大阪大学、大阪
  • Year and Date: 2014-09-08 – 2014-09-09
• [Presentation] 高圧下でのFe-S-H系融点測定から探る火星核 (2014)
  • Author(s): 柴崎裕樹、大谷栄治、寺崎英紀、Yingwei Fei、肥後祐司
  • Organizer: 月・火星・水星内部研究会
  • Place of Presentation: 大阪大学、大阪
  • Year and Date: 2014-09-08 – 2014-09-09
• [Presentation] 惑星核中の水素について (2014)
  • Author(s): 近藤忠、山下智也、吉田祐基、寺崎英紀、亀卦川卓美
  • Organizer: 月・火星・水星内部研究会
  • Place of Presentation: 大阪大学、大阪
  • Year and Date: 2014-09-08 – 2014-09-09
• [Presentation] 高圧力下でのFe3Sの磁性的弾性的特徴：地球型惑星核への応用 (2014)
  • Author(s): 鎌田誠司，大谷栄治，平尾直久，鈴木那奈美，寺崎英紀，高橋豪，福井宏之，浜田麻希，Baron A.Q.，増田亮，三井隆也，大石泰生
  • Organizer: 月・火星・水星内部研究会
  • Place of Presentation: 大阪大学、大阪
  • Year and Date: 2014-09-08 – 2014-09-09
• [Presentation] 惑星深部条件における鉄合金の音速と密度 (2014)
  • Author(s): 境家達弘、横山直也、細木亮太、近藤忠、寺崎英紀、弘中陽一郎、重森啓介
  • Organizer: 月・火星・水星内部研究会
  • Place of Presentation: 大阪大学、大阪
  • Year and Date: 2014-09-08 – 2014-09-09
• [Presentation] 高圧下における鉄-炭素系融体の密度-弾性波同時測定と惑星外核への適用 (2014)
  • Author(s): 下山裕太、寺崎英紀、浦川啓、桑原荘馬、田窪勇作
  • Organizer: 月・火星・水星内部研究会
  • Place of Presentation: 大阪大学、大阪
  • Year and Date: 2014-09-08 – 2014-09-09
• [Presentation] 超音波法を用いた高圧下におけるFe-Ni及びFe-Ni-C融体の音速測定 (2014)
  • Author(s): 桑原荘馬、寺崎英紀、西田圭佑、下山裕太、肥後祐司、田窪勇作、浦川啓、鈴木芳生、竹内晃久、上杉健太朗、近藤忠
  • Organizer: 月・火星・水星内部研究会
  • Place of Presentation: 大阪大学、大阪
  • Year and Date: 2014-09-08 – 2014-09-09
• [Presentation] レーザー衝撃圧縮法によるFeSi融体の音速密度測定 (2014)
  • Author(s): 細木亮太、境家達弘、横山直也、近藤忠、寺崎英紀、重森啓介、弘中陽一郎
  • Organizer: 月・火星・水星内部研究会
  • Place of Presentation: 大阪大学、大阪
  • Year and Date: 2014-09-08 – 2014-09-09
• [Presentation] 高温高圧下における過剰炭素が存在するC-Mg-Fe-Si-O系の相平衡・融解関係：月サイズ天体内部への応用 (2014)
  • Author(s): 高橋豪，大谷栄治，寺崎英紀，伊藤嘉紀，柴崎裕樹，石井美帆，舟越賢一，肥後祐司
  • Organizer: 月・火星・水星内部研究会
  • Place of Presentation: 大阪大学、大阪
  • Year and Date: 2014-09-08 – 2014-09-09
• [Presentation] Relationship between sound velocity and density of liquid alloys under pressure (2014)
  • Author(s): Terasaki, H., K. Nishida, S. Urakawa, S. Kuwabara, Y. Shimoyama, Y. Takubo, K. Uesugi, A. Takeuchi, Y. Suzuki, Y. Kono, Y. Higo, Y. Katayama, T. Watanuki, T. Kondo
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: パシフィコ横浜、横浜
  • Year and Date: 2014-04-28 – 2014-05-02
• [Presentation] Simultaneous measurement of liquid Fe-C density and sound velocity at high pressure (2014)
  • Author(s): Y. Shimoyama, H. Terasaki, Y. Takubo, S. Urakawa, S. Kuwabara, Y. Katayama
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: パシフィコ横浜、横浜
  • Year and Date: 2014-04-28 – 2014-05-02
• [Presentation] Sound velocity and density measurement of liquid FeSi alloy by laser-shock compression (2014)
  • Author(s): R. Hosogi, N. Yokoyama, T. Sakaiya, T. Kondo, H. Terasaki, K. Shigemori, Y. Hironaka
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: パシフィコ横浜、横浜
  • Year and Date: 2014-04-28 – 2014-05-02
• [Presentation] Sound velocities of laser-shocked Fe-Ni alloys under Earth core conditions (2014)
  • Author(s): T. Sakaiya, N. Yokoyama, R. Hosogi, T. Kondo, H. Terasaki, K. Shigemori, Y. Hironaka
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: パシフィコ横浜、横浜
  • Year and Date: 2014-04-28 – 2014-05-02
• [Book] Deep Earth: Physics and Chemistry of the Lower Mantle and Core (2016)
  • Author(s): Terasaki, H., R.A. Fischer
  • Total Pages: 312
  • Publisher: American Geophysical Union / Wiley