Updated on 2025/10/13

写真a

 
TERASAKI Hidenori
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
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Degree

  • 理学博士 ( 筑波大学 )

Research Interests

  • Iron alloy

  • Core

  • Physical properties of liquids

  • High Pressure Experiments

  • Planetary interior structure

  • Differentiation of planetary interiors

Research Areas

  • Natural Science / Solid earth sciences

Education

  • University of Tsukuba   大学院地球科学研究科  

    1997.4 - 2002.3

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  • University of Tsukuba   第一学群自然学類  

    1993.4 - 1997.3

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Research History

  • Okayama University   The Graduate School of Natural Science and Technology   Professor

    2020.4

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    Country:Japan

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  • Osaka University   Graduate school of Science, Department of Earth and Space Science   Associate Professor

    2011.4 - 2020.3

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  • Tohoku University   Graduate school of Science, Department of Earth and Planetary Materials Science   Assistant Professor

    2004.4 - 2011.3

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  • University of Bayreuth   Bayerisches Geoinstitut   Postdoctoral fellow

    2002.4 - 2004.3

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Professional Memberships

  • THE JAPAN SOCIETY OF HIGH PRESSURE SCIENCE AND TECHNOLOGY

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  • American Geophysical Union

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  • THE IRON AND STEEL INSTITUTE OF JAPAN

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  • THE JAPANESE SOCIETY FOR PLANETARY SCIENCES

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  • Japan Association of Mineralogical Sciences

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Committee Memberships

  • 日本鉱物科学会   Elements委員会副委員長  

    2024.9   

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  • 日本高圧力学会   会計幹事・評議員  

    2023.9   

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  • 日本高圧力学会   渉外幹事・評議員  

    2014.9 - 2016.8   

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  • 日本高圧力学会   高圧討論会実行委員  

    2011.11 - 2012.11   

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  • 日本鉱物科学会   行事委員  

    2011.10   

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  • 日本鉱物科学会   Elements委員  

    2011.10 - 2024.8   

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  • 日本高圧力学会   高圧討論会実行委員  

    2009.11 - 2010.11   

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Papers

  • GHz ultrasonics in a diamond anvil cell (DAC) to investigate the elasticity of the lower mantle constituents Reviewed

    Akira Yoneda, Ryo Tsuruoka, Takuto Kato, Seiji Kamada, Hidenori Terasaki, Tadashi Kondo, Daisuke Yamazaki

    High Pressure Research   45 ( 3 )   234 - 255   2025.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/08957959.2025.2540825

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  • Development of density measurement at high pressure and high temperature using the x-ray absorption method combined with laser-heated diamond anvil cell Reviewed

    Hidenori Terasaki, Hiroyuki Kamina, Saori I. Kawaguchi, Tadashi Kondo, Ko Morioka, Ryo Tsuruoka, Moe Sakurai, Akira Yoneda, Seiji Kamada, Naohisa Hirao

    Review of Scientific Instruments   96 ( 3 )   033907   2025.3

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    The densities of liquid materials at high pressures and high temperatures are important information to understand the elastic behavior of liquids at extreme conditions, which is closely related to the formation and evolution processes of the Earth and planetary interiors. The x-ray absorption method is an effective method to measure the density of non-crystalline materials at high pressures. However, the temperature condition of the x-ray absorption method using a diamond anvil cell (DAC) has been limited to 720 K to date. To significantly expand the measurable temperature condition of this method, in this study, we developed a density measurement technique using the x-ray absorption method in combination with a laser-heated DAC. The density of solid Ni was measured up to 26 GPa and 1800 K using the x-ray absorption method and evaluated by comparison with the density obtained from the x-ray diffraction. The density of solid Ni with a thickness >17 μm was determined with an accuracy of 0.01%–2.2% (0.001–0.20 g/cm3) and a precision of 0.8%–1.8% (0.07–0.16 g/cm3) in the x-ray absorption method. The density of liquid Ni was also determined to be 8.70 ± 0.15–8.98 ± 0.38 g/cm3 at 16–23 GPa and 2230–2480 K. Consequently, the temperature limit of the x-ray absorption method can be expanded from 720 to 2480 K by combining it with a laser-heated DAC in this study.

    DOI: 10.1063/5.0223133

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  • The extent of liquid immiscibility in planetesimal cores Reviewed

    G.D. Bromiley, M. Varnam, H. Terasaki, T. Komabayashi, J. Barosch

    Geochemical Perspectives Letters   33   7 - 12   2024.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:European Association of Geochemistry  

    DOI: 10.7185/geochemlet.2445

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  • Wetting property of Fe–S melt in solid core: Implication for the core crystallization process in planetesimals Reviewed International journal

    Shiori Matsubara, Hidenori Terasaki, Takashi Yoshino, Satoru Urakawa, Daisuke Yumitori

    Meteoritics and Planetary Science   2024.3

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1111/maps.14149

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  • Deuterium Content and Site Occupancy in Iron Sulfide at High Pressure and Temperature Determined Using In Situ Neutron Diffraction Measurements Reviewed International coauthorship International journal

    Sumith Abeykoon, Christopher Howard, Serena Dominijanni, Lisa Eberhard, Alexander Kurnosov, Daniel J. Frost, Tiziana Boffa Ballaran, Hidenori Terasaki, Tatsuya Sakamaki, Akio Suzuki, Eiji Ohtani, Asami Sano‐Furukawa, Jun Abe

    Journal of Geophysical Research: Solid Earth   128 ( 9 )   2023.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Geophysical Union (AGU)  

    Abstract

    We have performed in situ time‐of‐flight neutron diffraction experiments to examine the uptake of deuterium in iron monosulfide at pressures up to 11.4 GPa and temperatures to 1300 K. A D2 fluid was formed in the experiments through the decomposition of ND3BD3, resulting in an oxygen fugacity of approximately 1.2 log units below the iron‐wüstite buffer. Deuterium positions and site occupancies were determined in FeS V, using Rietveld refinements of the powder neutron diffraction patterns. Our structural model indicates that two normally unoccupied sites in the P63/mmc FeS V structure, at Wyckoff positions 6h and 4f, are partially occupied by D atoms, with the latter being more dominant. The deuterium content Dx in FeSDX increases with both pressure and temperature over the experimental conditions explored, from 0.126 (14) at 2.3 GPa and 787 K to 1.20 (16) at 9.7 GPa and 1300 K. The unit‐cell volume expansion per deuterium atom is 1.53 ± 0.16 Å3 at 6.9 GPa and 960 K, which is smaller than that determined for metallic iron phases at similar conditions. The variation in unit‐cell volume indicates that most deuterium is lost from FeS V upon temperature quenching at high‐pressures. By fitting the obtained FeS V deuterium site occupancies to a thermodynamic model, estimates for the hydrogen contents of iron monosulfide at conditions and oxygen fugacities consistent with the base of the cratonic lithosphere can be made. This results in values in the range of 1,700–2,700 ppm, which contribute to approximately 2–3 ppm hydrogen in the bulk mantle.

    DOI: 10.1029/2023jb026710

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  • Density Measurements of Fe-Ni-S Liquids at High Pressure Reviewed

    Satoru Urakawa, Hidenori Terasaki, Syun-pachi Kishimoto, Naonori Inoue, Yuta Shimoyama, Yusaku Takubo, Akihiko Machida

    SPring-8/SACLA Research Report   11   218 - 220   2023.8

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    Language:English  

    DOI: 10.18957/rr.11.4.218

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  • Sound velocity and elastic properties of Fe–Ni–S–Si liquid: the effects of pressure and multiple light elements Reviewed International journal

    Iori Yamada, Hidenori Terasaki, Satoru Urakawa, Tadashi Kondo, Akihiko Machida, Yoshinori Tange, Yuji Higo

    Physics and Chemistry of Minerals   50 ( 3 )   2023.7

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    Fe–Ni–S–Si alloy is considered to be one of the plausible candidates of Mercury core material. Elastic properties of Fe–Ni–S–Si liquid are important to reveal the density profile of the Mercury core. In this study, we measured the P-wave velocity (VP) of Fe–Ni–S–Si (Fe73Ni10S10Si7, Fe72Ni10S5Si13, and Fe67Ni10S10Si13) liquids up to 17 GPa and 2000 K to study the effects of pressure, temperature, and multiple light elements (S and Si) on the VP and elastic properties.

    The VP of Fe–Ni–S–Si liquids are less sensitive to temperature. The effect of pressure on the VP are close to that of liquid Fe and smaller than those of Fe–Ni–S and Fe–Ni–Si liquids. Obtained elastic properties are KS0 = 99.1(9.4) GPa, KS’ = 3.8(0.1) and ρ0 =6.48 g/cm3 for S-rich Fe73Ni10S10Si7 liquid and KS0 = 112.1(1.5) GPa, KS’ = 4.0(0.1) and ρ0=6.64 g/cm3 for Si-rich Fe72Ni10S5Si13 liquid. The VP of Fe–Ni–S–Si liquids locate in between those of Fe–Ni–S and Fe–Ni–Si liquids. This suggests that the effect of multiple light element (S and Si) on the VP is suppressed and cancel out the effects of single light elements (S and Si) on the VP. The effect of composition on the EOS in the Fe–Ni–S–Si system is indispensable to estimate the core composition combined with the geodesy data of upcoming Mercury mission.

    DOI: 10.1007/s00269-023-01243-8

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    Other Link: https://link.springer.com/article/10.1007/s00269-023-01243-8/fulltext.html

  • Density and elastic properties of liquid gallium up to 10 GPa using X-ray absorption method combined with externally heated diamond anvil cell Reviewed International journal

    Ryo Tsuruoka, Hidenori Terasaki, Seiji Kamada, Fumiya Maeda, Tadashi Kondo, Naohisa Hirao, Saori I. Kawaguchi, Iori Yamada, Satoru Urakawa, Akihiko Machida

    High Pressure Research   41 ( 4 )   379 - 391   2021.10

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    DOI: 10.1080/08957959.2021.1998478

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  • In situ observation of the Rayleigh–Taylor instability of liquid Fe and Fe–Si alloys under extreme conditions: Implications for planetary core formation Reviewed International journal

    Hidenori Terasaki, Tatsuhiro Sakaiya, Keisuke Shigemori, Kosaku Akimoto, Hiroki Kato, Yoichiro Hironaka, Tadashi Kondo

    Matter and Radiation at Extremes   6 ( 5 )   054403 - 054403   2021.9

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    DOI: 10.1063/5.0029448

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  • Precise determination of the effect of temperature on the density of solid and liquid iron, nickel, and tin Reviewed International journal

    Asaka Kamiya, Hidenori Terasaki, Tadashi Kondo

    American Mineralogist   106 ( 7 )   1077 - 1082   2021.7

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Mineralogical Society of America  

    <title>Abstract</title>
    Density and thermal expansion coefficient of metals are fundamental characteristics to describe the equation of state. Especially for liquid metals, the reported data for density and thermal expansion coefficient vary in the literature, even at ambient pressure. To determine the density of solid and liquid metals precisely at high temperatures and ambient pressure, we have developed a high-temperature furnace. The densities of solid Sn, Ni, and Fe were determined from the sample image with an uncertainty of 0.11–0.7% in the temperature range of 285–1803 K with increments of 1–10 K. The density of solid Sn decreased linearly with increasing temperature up to 493 K, and then the decrease became drastic until the melting temperature (Tm) was reached. By contrast, for solid Ni and Fe, the densities decreased linearly with increasing temperature up to the Tm (1728 and 1813 K) without any drastic density drop near Tm. This suggests that Ni and Fe do not exhibit the “premelting effect.”


    The density of liquid Fe was determined with an uncertainty of 0.4–0.7% in the range of 1818–1998 K with temperature increments of 5 K. The obtained thermal expansion coefficient (α) of liquid Fe was well approximated as either a constant value of α = 2.42(1) × 10–4 K–1 or a linear function of temperature (T); α = 1.37(10) × 10–3 – [6.0(6) × 10–7]T [K–1] up to at least 2000 K.

    DOI: 10.2138/am-2021-7509

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  • Thermocapillary effects in two-phase medium and applications to metal-silicate separation Reviewed International coauthorship International journal

    Yanick Ricard, Stéphane Labrosse, Hidenori Terasaki, David Bercovici

    Physics of the Earth and Planetary Interiors   311   106640 - 106640   2021.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.pepi.2020.106640

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  • Effect of sulfur on sound velocity of liquid iron under Martian core conditions Reviewed International journal

    Keisuke Nishida, Yuki Shibazaki, Hidenori Terasaki, Yuji Higo, Akio Suzuki, Nobumasa Funamori, Kei Hirose

    Nature Communications   11 ( 1 )   2020.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1038/s41467-020-15755-2

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    Other Link: http://www.nature.com/articles/s41467-020-15755-2

  • Surface structure on diamond foils generated by spatially nonuniform laser irradiation Reviewed International journal

    Hiroki Kato, Hideo Nagatomo, Mitsuo Nakai, Tatsuhiro Sakaiya, Hidenori Terasaki, Tadashi Kondo, Yoichiro Hironaka, Katsuya Shimizu, Keisuke Shigemori

    Scientific Reports   10 ( 1 )   2020.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    <title>Abstract</title>Here we report on the effects of material strength factors on the generation of surface structure due to nonuniform laser irradiation. The influence of material strength on the generation of perturbation on a diamond surface subjected to nonuniform laser irradiation was experimentally investigated. Our previous investigations suggested that stiffer and denser materials reduce surface perturbation due to spatially nonuniform laser irradiation, which was reproduced well by calculations with multi-dimensional hydrodynamic simulation code. In this work, we found that local fractures due to yield strength failure are generated by high degrees of irradiation non-uniformity. A characteristic crack-like surface structure was observed, which was not reproduced by the 2D simulation code calculations at all. The 2D simulations showed that the pressure at the diamond surface locally exceeds the Hugoniot elastic limit due to nonuniform irradiation, implying the potential for development of surface perturbations. We also measured the areal-density distribution of perturbations for single-crystal diamond and diamond with a thin high atomic number (high-Z) coating on its surface. The experimental results imply that the combination of a stiff material and thin high-Z coating can suppress the solid-strength effects caused by large irradiation non-uniformity. The knowledge given here is applicable to inertial confinement fusion target design, laser material processing, and universal problems involving solids and high-energy-density plasmas.

    DOI: 10.1038/s41598-020-66036-3

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    Other Link: http://www.nature.com/articles/s41598-020-66036-3

  • Physical Properties and Composition of Cores of Terrestrial Planets Reviewed

    Hidenori TERASAKI

    The Review of High Pressure Science and Technology   30 ( 2 )   111 - 117   2020

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of High Pressure Science and Technology  

    DOI: 10.4131/jshpreview.30.111

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  • Pressure and composition effects on sound velocity and density of core-forming liquids: Implication to core compositions of terrestrial planets Reviewed International coauthorship

    H. Terasaki, A. Rivoldini, Y. Shimoyama, K. Nishida, S. Urakawa, M. Maki, F. Kurokawa, Y. Takubo, Y. Shibazaki, T. Sakamaki, A. Machida, Y. Higo, K. Uesugi, A. Takeuchi, T. Watanuki, T. Kondo

    Journal of Geophysical Research: Planets   124   2272 - 2293   2019.9

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  • Interstitial hydrogen atoms in face-centered cubic iron in the Earth's core Reviewed

    Ikuta Daijo, Ohtani Eiji, Sano-Furukawa Asami, Shibazaki Yuki, Terasaki Hidenori, Yuan Liang, Hattori Takanori

    SCIENTIFIC REPORTS   9 ( 1 )   2019.5

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    DOI: 10.1038/s41598-019-43601-z

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    Other Link: https://www.nature.com/articles/s41598-019-43601-z

  • Sound velocity and density of liquid Ni68S32 under pressure using ultrasonic and X-ray absorption with tomography methods Reviewed

    Terasaki Hidenori, Nishida Keisuke, Urakawa Satoru, Takubo Yusaku, Kuwabara Soma, Shimoyama Yuta, Uesugi Kentaro, Kono Yoshio, Takeuchi Akihisa, Suzuki Yoshio, Higo Yuji, Kondo Tadashi

    COMPTES RENDUS GEOSCIENCE   351 ( 2-3 )   163 - 170   2019.2

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    DOI: 10.1016/j.crte.2018.04.005

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  • Measurements of Rayleigh–Taylor instability growth of laser-shocked iron–silicon alloy Reviewed

    Tatsuhiro Sakaiya, Hidenori Terasaki, Kosaku Akimoto, Hiroki Kato, Taichi Ueda, Ryota Hosogi, Takashi Fujikawa, Tadashi Kondo, Yoichiro Hironaka, Keisuke Shigemori

    High Pressure Research   39 ( 1 )   150 - 159   2019.1

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1080/08957959.2019.1575966

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  • Density and elasticity measurements for liquid materials

    Hidenori Terasaki, Keisuke Nishida

    Magmas Under Pressure: Advances in High-Pressure Experiments on Structure and Properties of Melts   237 - 260   2018.1

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    Language:English   Publishing type:Part of collection (book)   Publisher:Elsevier  

    DOI: 10.1016/B978-0-12-811301-1.00009-5

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  • Variations of lattice constants and thermal expansion coefficients of indium at high pressure and high temperature Reviewed

    Takubo Yusaku, Terasaki Hidenori, Kondo Tadashi, Mitai Shingo, Kamada Seiji, Kikegawa Takumi, Machida Akihiko

    HIGH PRESSURE RESEARCH   38 ( 4 )   406 - 413   2018

  • Development of density measurement for metals at high pressures and high temperatures using X-ray absorption imaging combined with externally heated diamond anvil cell Reviewed

    Yusaku Takubo, Hidenori Terasaki, Tadashi Kondo, Shingo Mitai, Seiji Kamada, Takumi Kikegawa, Akihiko Machida

    Comptes Rendus - Geoscience   351 ( 2-3 )   182 - 189   2018

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    DOI: 10.1016/j.crte.2018.04.002

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  • 形成期の惑星内部における鉄合金メルトとケイ酸塩の分離過程 Reviewed

    岸本俊八, 浦川啓, 寺﨑英紀, 桑原荘馬, 西田圭佑, 坂巻竜也, 竹内晃久, 上杉健太朗

    SPring-8/SACLA利用研究成果集   25   208 - 211   2018

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    Language:Japanese  

    DOI: 10.18957/rr.6.2.208

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  • Elastic wave velocity measurements of iron-silicon alloy under high pressure and temperature conditions Reviewed

    Sakamaki Tatsuya, Terasaki Hidenori, Shibazaki Yuki, Tobe Hiromu, Shimoyama Yuta, Higo Yuji, Suzuki Akio

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences   2017 ( 0 )   103 - 103   2017

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    Language:Japanese   Publisher:Japan Association of Mineralogical Sciences  

    Elastic wave velocities and density of iron-silicon alloys were determined experimentally up to 6 GPa and 1873 K using ultrasonic and X-ray diffraction methods. We suceeded in determining the pressure- and temperature-dependences of the properties, and also found the difference between bcc and fcc structures.

    DOI: 10.14824/jakoka.2017.0_103

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  • Simultaneous sound velocity and density measurements of iron-silicon alloys under core conditions of Mercury and Mars

    Sakamaki, T, Terasaki, H, Shibazaki, Y, Suzuki, A, Tobe, H, Higo, Y, Kurokawa, F, Maki, M, Shimoyama, Y, Saito, R

    SPring-8 User Experiment Report 2016B   2016B1111   2017

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  • Thermoelastic properties of liquid Fe-C revealed by sound velocity and density measurements at high pressure Reviewed

    Yuta Shimoyama, Hidenori Terasaki, Satoru Urakawa, Yusaku Takubo, Soma Kuwabara, Shunpachi Kishimoto, Tetsu Watanuki, Akihiko Machida, Yoshinori Katayama, Tadashi Kondo

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   121 ( 11 )   7984 - 7995   2016.11

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    DOI: 10.1002/2016JB012968

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  • Towards a consensus on the pressure and composition dependence of sound velocity in the liquid Fe-S system Reviewed

    Keisuke Nishida, Akio Suzuki, Hidenori Terasaki, Yuki Shibazaki, Yuji Higo, Souma Kuwabara, Yuta Shimoyama, Moe Sakurai, Masashi Ushioda, Eiichi Takahashi, Takumi Kikegawa, Daisuke Wakabayashi, Nobumasa Funamori

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   257   230 - 239   2016.8

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    DOI: 10.1016/j.pepi.2016.06.009

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  • Compressional and shear wave velocities for polycrystalline bcc-Fe up to 6.3 GPa and 800 K Reviewed

    Yuki Shibazaki, Keisuke Nishida, Yuji Higo, Mako Igarashi, Masaki Tahara, Tatsuya Sakamaki, Hidenori Terasaki, Yuta Shimoyama, Soma Kuwabara, Yusaku Takubo, Eiji Ohtani

    AMERICAN MINERALOGIST   101 ( 5-6 )   1150 - 1160   2016.5

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    DOI: 10.2138/am-2016-5545

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  • Sound velocity and elastic properties of Fe-Ni and Fe-Ni-C liquids at high pressure Reviewed

    Soma Kuwabara, Hidenori Terasaki, Keisuke Nishida, Yuta Shimoyama, Yusaku Takubo, Yuji Higo, Yuki Shibazaki, Satoru Urakawa, Kentaro Uesugi, Akihisa Takeuchi, Tadashi Kondo

    PHYSICS AND CHEMISTRY OF MINERALS   43 ( 3 )   229 - 236   2016.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00269-015-0789-y

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  • Physical Properties of the Outer Core Reviewed

    Hidenori Terasaki

    Deep Earth: Physics and Chemistry of the Lower Mantle and Core   129 - 142   2015.1

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    Language:English   Publishing type:Part of collection (book)   Publisher:wiley  

    DOI: 10.1002/9781118992487.ch11

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  • Equation of state of Fe3S at room temperature up to 2 megabars Reviewed

    Seiji Kamada, Eiji Ohtani, Hidenori Terasaki, Takeshi Sakai, Suguru Takahashi, Naohisa Hirao, Yasuo Ohishi

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   228   106 - 113   2014.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.pepi.2013.11.001

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  • High-pressure and high-temperature phase diagram for Fe0.9Ni0.1-H alloy Reviewed

    Yuki Shibazaki, Hidenori Terasaki, Eiji Ohtani, Ryuji Tateyama, Keisuke Nishida, Ken-ichi Funakoshi, Yuji Higo

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   228   192 - 201   2014.3

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    DOI: 10.1016/j.pepi.2013.12.013

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  • The sound velocity measurements of Fe3S Reviewed

    Seiji Kamada, Eiji Ohtani, Hiroshi Fukui, Takeshi Sakai, Hidenori Terasaki, Suguru Takahashi, Yuki Shibazaki, Satoshi Tsutsui, Alfred Q. R. Baron, Naohisa Hirao, Yasuo Ohishi

    AMERICAN MINERALOGIST   99 ( 1 )   98 - 101   2014.1

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    DOI: 10.2138/am.2014.4463

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  • Repulsive Nature for Hydrogen Incorporation to Fe3C up to 14 GPa Reviewed

    Hidenori Terasaki, Yuki Shibazaki, Keisuke Nishida, Ryuji Tateyama, Suguru Takahashi, Miho Ishii, Yuta Shimoyama, Eiji Ohtani, Ken-ichi Funakoshi, Yuji Higo

    ISIJ INTERNATIONAL   54 ( 11 )   2637 - 2642   2014

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2355/isijinternational.54.2637

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  • Ponded melt at the boundary between the lithosphere and asthenosphere Reviewed

    Tatsuya Sakamaki, Akio Suzuki, Eiji Ohtani, Hidenori Terasaki, Satoru Urakawa, Yoshinori Katayama, Ken-ichi Funakoshi, Yanbin Wang, John W. Hernlund, Maxim D. Ballmer

    NATURE GEOSCIENCE   6 ( 12 )   1041 - 1044   2013.12

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    DOI: 10.1038/NGEO1982

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  • Density of Fe-3.5 wt% C liquid at high pressure and temperature and the effect of carbon on the density of the molten iron Reviewed

    Yuta Shimoyama, Hidenori Terasaki, Eiji Ohtani, Satoru Urakawa, Yusaku Takubo, Keisuke Nishida, Akio Suzuki, Yoshinori Katayama

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   224   77 - 82   2013.11

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  • Phase relations in the carbon-saturated C-Mg-Fe-Si-O system and C and Si solubility in liquid Fe at high pressure and temperature: Implications for planetary interiors Reviewed

    Suguru Takahashi, Eiji Ohtani, Hidenori Terasaki, Yoshinori Ito, Yuki Shibazaki, Miho Ishii, Ken ichi Funakoshi, Yuji Higo

    Physics and Chemistry of Minerals   40 ( 8 )   647 - 657   2013.9

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  • Sound velocity measurements in liquid Fe-S at high pressure: Implications for Earth's and lunar cores Reviewed

    Keisuke Nishida, Yoshio Kono, Hidenori Terasaki, Suguru Takahashi, Miho Ishii, Yuta Shimoyama, Yuji Higo, Ken-ichi Funakoshi, Tetsuo Irifune, Eiji Ohtani

    EARTH AND PLANETARY SCIENCE LETTERS   362   182 - 186   2013.1

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    DOI: 10.1016/j.epsl.2012.11.042

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  • Melting relationships in the Fe-Fe3S system up to the outer core conditions Reviewed

    Seiji Kamada, Eiji Ohtani, Hidenori Terasaki, Takeshi Sakai, Masaaki Miyahara, Yasuo Ohishi, Naohisa Hirao

    EARTH AND PLANETARY SCIENCE LETTERS   359   26 - 33   2012.12

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    DOI: 10.1016/j.epsl.2012.09.038

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  • Density of liquids in Fe-FeO system at high pressure

    Terasaki, H, Takubo, Y, Shimoyama, Y, Suzuki, A, Nishida, K, Ohtani, E, Urakawa, S, Kondo, T, Katayama, Y

    SPring-8 User Experiment Report No.29 (2012A)   29   2012A3782   2012.11

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  • Interfacial tension of Fe-Si liquid at high pressure: Implications for liquid Fe-alloy droplet size in magma oceans Reviewed

    Hidenori Terasaki, Satoru Urakawa, David C. Rubie, Ken-ichi Funakoshi, Tatsuya Sakamaki, Yuki Shibazaki, Shin Ozawa, Eiji Ohtani

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   202   1 - 6   2012.8

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    DOI: 10.1016/j.pepi.2012.05.002

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  • In-Situ Observations of Martensitic Transformation in Blast-Resistant Steel Reviewed

    Xinghua Yu, Sudarsanam Suresh Babu, John C. Lippold, Hidenori Terasaki, Yu-ichi Komizo

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   43A ( 5 )   1538 - 1546   2012.5

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  • Stability of Fe-Ni hydride after the reaction between Fe-Ni alloy and hydrous phase (delta-AlOOH) up to 1.2 Mbar: Possibility of H contribution to the core density deficit Reviewed

    Hidenori Terasaki, Eiji Ohtani, Takeshi Sakai, Seiji Kamada, Hidetoshi Asanuma, Yuki Shibazaki, Naohisa Hirao, Nagayoshi Sata, Yasuo Ohishi, Tatsuya Sakamaki, Akio Suzuki, Ken-ichi Funakoshi

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   194   18 - 24   2012.3

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  • Compression of Fe88.1Ni9.1S2.8 alloy up to the pressure of Earth's inner core Reviewed

    Takeshi Sakai, Eiji Ohtani, Seiji Kamada, Hidenori Terasaki, Naohisa Hirao

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   117   2012.2

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    DOI: 10.1029/2011JB008745

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  • Density measurements of liquid Fe-Si alloys at high pressure using the sink-float method Reviewed

    Ryuji Tateyama, Eiji Ohtani, Hidenori Terasaki, Keisuke Nishida, Yuki Shibazaki, Akio Suzuki, Takumi Kikegawa

    PHYSICS AND CHEMISTRY OF MINERALS   38 ( 10 )   801 - 807   2011.12

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  • Phase stability and compression study of (Fe-0.89,Ni-0.11)(3)S up to pressure of the Earth&apos;s core Reviewed

    Takeshi Sakai, Eiji Ohtani, Hidenori Terasaki, Seiji Kamada, Naohisa Hirao, Masaaki Miyahara, Masahiko Nishijima

    AMERICAN MINERALOGIST   96 ( 10 )   1490 - 1494   2011.10

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    DOI: 10.2138/am.2011.3822

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  • Static compression of Fe0.83Ni0.09Si0.08 alloy to 374 GPa and Fe0.93Si0.07 alloy to 252 GPa: Implications for the Earth's inner core Reviewed

    Hidetoshi Asanuma, Eiji Ohtani, Takeshi Sakai, Hidenori Terasaki, Seiji Kamada, Naohisa Hirao, Yasuo Ohishi

    EARTH AND PLANETARY SCIENCE LETTERS   310 ( 1-2 )   113 - 118   2011.10

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  • Density measurement of liquid FeS at high pressures using synchrotron X-ray absorption Reviewed

    Keisuke Nishida, Eiji Ohtani, Satoru Urakawa, Akio Suzuki, Tatsuya Sakamaki, Hidenori Terasaki, Yoshinori Katayama

    AMERICAN MINERALOGIST   96 ( 5-6 )   864 - 868   2011.5

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    DOI: 10.2138/am.2011.3616

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  • Density of carbonated peridotite magma at high pressure using an X-ray absorption method Reviewed

    Tatsuya Sakamaki, Eiji Ohtani, Satoru Urakawa, Hidenori Terasaki, Yoshinori Katayama

    AMERICAN MINERALOGIST   96 ( 4 )   553 - 557   2011.4

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    DOI: 10.2138/am.2011.3577

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  • Pressure and temperature dependence of the viscosity of a NaAlSi2O6 melt Reviewed

    Akio Suzuki, Eiji Ohtani, Hidenori Terasaki, Keisuke Nishida, Hiromi Hayashi, Tatsuya Sakamaki, Yuki Shibazaki, Takumi Kikegawa

    PHYSICS AND CHEMISTRY OF MINERALS   38 ( 1 )   59 - 64   2011.1

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  • Hydrogenation of FeSi under high pressure Reviewed

    Hidenori Terasaki, Yuki Shibazaki, Tatsuya Sakamaki, Ryuji Tateyama, Eiji Ohtani, Ken-ichi Funakoshi, Yuji Higo

    AMERICAN MINERALOGIST   96 ( 1 )   93 - 99   2011.1

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    DOI: 10.2138/am.2011.3628

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  • Effect of hydrogen on the melting temperature of FeS at high pressure: Implications for the core of Ganymede Reviewed

    Yuki Shibazaki, Eiji Ohtani, Hidenori Terasaki, Ryuji Tateyama, Tatsuya Sakamaki, Taku Tsuchiya, Ken-ichi Funakoshi

    EARTH AND PLANETARY SCIENCE LETTERS   301 ( 1-2 )   153 - 158   2011.1

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  • Hydrogenation of FeSi and FeS alloys at high pressure and high temperature Reviewed

    Hidenori Terasaki, Yuki Shibazaki

    Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu   21 ( 3 )   197 - 205   2011

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  • Liquidus and solidus temperatures of a Fe-O-S alloy up to the pressures of the outer core: Implication for the thermal structures of the Earth’s core. Reviewed

    Terasaki H, Kamada S, Sakai T, Ohtani E, Hirao N, Ohishi Y

    Earth and Planetary Science Letters   304 ( 3-4 )   559 - 564   2011

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  • X-ray imaging of melts and its application to Earth and planetary interior.

    Ohtani, E, Suzuki, A, Terasaki, H, Nishida, K, Shiraishi, R, Tateyama, R

    Photon Factory Activity Report 2009 (KEK Progress Report 2010-4)   27   188   2010.12

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  • Stress relaxation experiments of olivine under conditions of subducted slab in Earth's deep upper mantle Reviewed

    Yu Nishihara, Ken-ichi Funakoshi, Yuji Higo, Noriyoshi Tsujino, Takaaki Kawazoe, Tomoaki Kubo, Akira Shimojuku, Hidenori Terasaki, Norimasa Nishiyama

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   183 ( 1-2 )   164 - 174   2010.11

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  • Stress relaxation experiments of olivine under conditions of subducted slab in Earth's deep upper mantle Reviewed

    Yu Nishihara, Ken-ichi Funakoshi, Yuji Higo, Noriyoshi Tsujino, Takaaki Kawazoe, Tomoaki Kubo, Akira Shimojuku, Hidenori Terasaki, Norimasa Nishiyama

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   183 ( 1-2 )   164 - 174   2010.11

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  • Fe-Mg partitioning between post-perovskite and ferropericlase in the lowermost mantle Reviewed

    Takeshi Sakai, Eiji Ohtani, Hidenori Terasaki, Masaaki Miyahara, Masahiko Nishijima, Naohisa Hirao, Yasuo Ohishi, Nagayoshi Sata

    PHYSICS AND CHEMISTRY OF MINERALS   37 ( 7 )   487 - 496   2010.7

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    DOI: 10.1007/s00269-009-0349-4

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  • Density measurement of Fe3C liquid using X-ray absorption image up to 10 GPa and effect of light elements on compressibility of liquid iron Reviewed

    H. Terasaki, K. Nishida, Y. Shibazaki, T. Sakamaki, A. Suzuki, E. Ohtani, T. Kikegawa

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   115 ( B6 )   B06207   2010.6

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    DOI: 10.1029/2009JB006905

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  • Melting of iron-silicon alloy up to the core-mantle boundary pressure: implications to the thermal structure of the Earth&apos;s core Reviewed

    Hidetoshi Asanuma, Eiji Ohtani, Takeshi Sakai, Hidenori Terasaki, Seiji Kamada, Tadashi Kondo, Takumi Kikegawa

    PHYSICS AND CHEMISTRY OF MINERALS   37 ( 6 )   353 - 359   2010.6

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    DOI: 10.1007/s00269-009-0338-7

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  • Density measurement of Fe<inf>3</inf>C liquid using X-ray absorption image up to 10 GPa and effect of light elements on compressibility of liquid iron Reviewed

    H. Terasaki, K. Nishida, Y. Shibazaki, T. Sakamaki, A. Suzuki, E. Ohtani, T. Kikegawa

    Journal of Geophysical Research: Solid Earth   115 ( 6 )   2010.6

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    DOI: 10.1029/2009JB006905

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  • Phase relationships of the Fe-FeS system in conditions up to the Earth's outer core Reviewed

    Seiji Kamada, Hidenori Terasaki, Eiji Ohtani, Takeshi Sakai, Takumi Kikegawa, Yasuo Ohishi, Naohisa Hirao, Nagayoshi Sata, Tadashi Kondo

    EARTH AND PLANETARY SCIENCE LETTERS   294 ( 1-2 )   94 - 100   2010.5

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  • Superconducting properties of SmFeAsO1-x prepared under high-pressure condition Reviewed

    Jing Ju, Khuong Huynh, Jun Tang, Zhaofei Li, Masanori Watahiki, Kazumi Sato, Hidenori Terasaki, Eiji Ohtani, Hirotsugu Takizawa, Katsumi Tanigaki

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS   71 ( 4 )   491 - 494   2010.4

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    DOI: 10.1016/j.jpcs.2009.12.019

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  • In situ observation of the formation of intragranular acicular ferrite at non-metallic inclusions in C-Mn steel Reviewed

    Di Zhang, Hidenori Terasaki, Yu-ichi Komizo

    ACTA MATERIALIA   58 ( 4 )   1369 - 1378   2010.2

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    DOI: 10.1016/j.actamat.2009.10.043

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  • Density measurement of silicate melt by X-ray absorption method at high pressures and high temperatures.

    Ohtani, E, Suzuki, A, Terasaki, H, Sakamaki, T, Urakawa, S, Katayama, Y

    SPring-8 User Experiment Report No.23 (2009A)   23   2009A3785   2010.1

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  • Viscosity of lunar high-Ti magma at high pressure.

    Suzuki, A, Ohtani, E, Nishida, K, Tateyama, R, Terasaki, H, Shibazaki, Y, Shiraishi, R, Kikegawa, T

    Photon Factory Activity Report 2008 (KEK Progress Report 2009-3)   26 ( Part B )   181   2010.1

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  • Density measurements of liquid Fe-S at high pressure using sink-float method.

    Tateyama, R, Suzuki, A, Ohtani, E, Terasaki, H, Nishida, K, Shimazaki, Y, Kikegawa, T

    Photon Factory Activity Report 2008 (KEK Progress Report 2009-3)   26 ( Part B )   178   2010.1

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  • Density measurements of liquid FeS at high pressure using X-ray absorption image.

    Nishida, K, Suzuki, A, Ohtani, E, Terasaki, H, Sakamaki, T, Shibazaki, Y, Hayashi, H, Funayama, M, Kikegawa, T

    Photon Factory Activity Report 2008 (KEK Progress Report 2009-3)   26 ( Part B )   179   2010.1

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  • Structure of basaltic magma at high pressures and high temperatures.

    Sakamaki, T, Ohtani, E, Suzuki, A, Terasaki, H, Shibazaki, Y, Hayashi, H, Funakoshi, K, Tateyama, R

    SPring-8 User Experiment Report No.23 (2009A)   23   2009A1661   2010.1

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  • Report on "Global network symposium on earth's dynamics" Reviewed

    Hidenori Terasaki

    Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu   20 ( 2 )   181 - 182   2010

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    DOI: 10.4131/jshpreview.20.181

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  • Performance of semi-sintered ceramics as pressure-transmitting media up to 30 GPa Reviewed

    Anton Shatskiy, Konstantin D. Litasov, Hidenori Terasaki, Tomoo Katsura, Eiji Ohtani

    HIGH PRESSURE RESEARCH   30 ( 3 )   443 - 450   2010

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    DOI: 10.1080/08957959.2010.515079

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  • Development of high pressure apparatus for X-ray microtomography at SPring-8 Reviewed

    S. Urakawa, H. P. Terasaki, K. Funakoshi, K. Uesugi, S. Yamamoto

    INTERNATIONAL CONFERENCE ON HIGH PRESSURE SCIENCE AND TECHNOLOGY, JOINT AIRAPT-22 AND HPCJ-50   215   012026-   2010

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    DOI: 10.1088/1742-6596/215/1/012026

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  • Pressure and temperature dependence of the viscosity of a NaAlSi2O6 melt Reviewed

    Suzuki A, E. Ohtani, H. Terasaki, K. Nishida,H. Hayashi, T. Sakamaki, Y. Shibazaki, K. Funakoshi, T. Kikegawa

    Physics and Chemistry of Minerals   10.1007/s00269-010-0381-4-   2010

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  • Stress measurement under high pressure using Kawai-type multi-anvil apparatus combined with synchrotron radiation Reviewed

    Nishihara Yu, Funakoshi Ken-ichi, Higo Yuji, Terasaki Hidenori, Nishiyama Norimasa, Kubo Tomoaki, Shimojuku Akira, Tsujino Noriyoshi

    JOURNAL OF SYNCHROTRON RADIATION   16 ( 6 )   757 - 761   2009.11

  • Stress measurement under high pressure using Kawai-type multi-anvil apparatus combined with synchrotron radiation Reviewed

    Yu Nishihara, Ken-ichi Funakoshi, Yuji Higo, Hidenori Terasaki, Norimasa Nishiyama, Tomoaki Kubo, Akira Shimojuku, Noriyoshi Tsujino

    JOURNAL OF SYNCHROTRON RADIATION   16   757 - 761   2009.11

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    DOI: 10.1107/S0909049509034955

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  • Hydrogen partitioning between iron and ringwoodite: Implications for water transport into the Martian core Reviewed

    Yuki Shibazaki, Eiji Ohtani, Hidenori Terasaki, Akio Suzuki, Ken ichi Funakoshi

    Earth and Planetary Science Letters   287 ( 3-4 )   463 - 470   2009.10

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    DOI: 10.1016/j.epsl.2009.08.034

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  • The partitioning of Pt-Re-Os between solid and liquid metal in the Fe-Ni-S system at high pressure: Implications for inner core fractionation Reviewed

    Hiromi Hayashi, Eiji Ohtani, Hidenori Terasaki, Yoshinori Ito

    GEOCHIMICA ET COSMOCHIMICA ACTA   73 ( 16 )   4836 - 4842   2009.8

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    DOI: 10.1016/j.gca.2009.05.055

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  • Fe-Mg partitioning between perovskite and ferropericlase in the lower mantle Reviewed

    Takeshi Sakai, Eiji Ohtani, Hidenori Terasaki, Naoki Sawada, Yusuke Kobayashi, Masaaki Miyahara, Masahiko Nishijima, Naohisa Hirao, Yasuo Ohishi, Takumi Kikegawa

    AMERICAN MINERALOGIST   94 ( 7 )   921 - 925   2009.7

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    DOI: 10.2138/am.2009.3123

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  • Density measurement of liquid FeS using X-ray absorption image.

    Nishida, K, Ohtani E, Suzuki, A, Terasaki, H, Sakamaki, T, Shibazaki, Y, Kikegawa, T

    Special Issue of the Review of High Pressure Science and Technology   19   448   2009.7

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  • Density and structure of basaltic magma under high pressure and high temperature.

    Sakamaki, T, Ohtani E, Urakawa, S, Suzuki, A, Terasaki, H, Katayama, Y, Funakoshi, K

    Special Issue of the Review of High Pressure Science and Technology   19   287   2009.7

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  • Density measurement of Fe-C liquid using X-ray absorption image under high pressure.

    Terasaki, H, Nishida, K, Suzuki, A, Ohtani E, Shibazaki, Y, Sakamaki, T, Kikegawa, T

    Special Issue of the Review of High Pressure Science and Technology   19   292   2009.7

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  • Effect of water on post-spinel transition and implication for 660 km seismic discontinuity at the Earth's mantle.

    Ghosh, S, Ohtani E, Suzuki, A, Litasov, K.D, Terasaki, H, Funakoshi, K

    Special Issue of the Review of High Pressure Science and Technology   19   461   2009.7

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  • Viscosity minimum of lunar high-Ti magma at high pressure and high temperature.

    Suzuki, A, Ohtani E, Nishida, K, Terasaki, H, Tateyama, R, Shiraishi, R, Kikegawa, T

    Special Issue of the Review of High Pressure Science and Technology   19   377   2009.7

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  • Hydrogen incorporation to the Earth's core Reviewed

    Hidenori Terasaki, Eiji Ohtani, Takeshi Sakai, Seiji Kamada, Yuki Shibazaki, Hidetoshi Asanuma, Hirao Naohisa, Yasuo Ohishi, Nagayoshi Sata, Tatsuya Sakamaki, Akio Suzuki, Ken-ichi Funakoshi

    GEOCHIMICA ET COSMOCHIMICA ACTA   73 ( 13 )   A1321 - A1321   2009.6

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  • Measurement of sound velocity of Fe-Ni-Si alloys at the ultrahigh pressure.

    Ohtani, E, Sakai, T, Terasaki, H, Murakami, M, Kamada, S, Suzuki, A, Hirao, N

    SPring-8 User Experiment Report No.22 (2008B)   22   2008B1584   2009.6

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  • Viscosities of depolymerized komatiite liquids at high pressure.

    Lesher, C, ODwyer-Brown, L, Terasaki, H, Suzuki, A, Ohtani, E, Yamada, A, Funakoshi, K

    SPring-8 User Experiment Report No.22 (2008B)   22   2008B1319   2009.6

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  • 高温高圧下における鉄-水素-軽元素系の相平衡関係.

    Terasaki, H, Shibazaki, Y, Sakamaki, T, Tateyama, R, Nishitani, N, ODwyer-Brown, L, Lesher, C, Yamada, A, Suzuki, A

    SPring-8 User Experiment Report No.22 (2008B)   22   2008B1439   2009.6

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  • Viscosity of basaltic magma at high pressure.

    Suzuki, A, Ohtani E, Terasaki, H, Sakamaki, T, Shibazaki, Y. Tateyama, R, Funakoshi, K

    SPring-8 User Experimental Report No.22 (2008B)   22   2008B1613   2009.6

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  • Solidus of carbonated peridotite from 10 to 20 GPa and origin of magnesiocarbonatite melt in the Earth&apos;s deep mantle Reviewed

    Sujoy Ghosh, Eiji Ohtani, Konstantin D. Litasov, Hidenori Terasaki

    CHEMICAL GEOLOGY   262 ( 1-2 )   17 - 28   2009.5

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    DOI: 10.1016/j.chemgeo.2008.12.030

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  • In situ measurement of interfacial tension of Fe-S and Fe-P liquids under high pressure using X-ray radiography and tomography techniques Reviewed

    H. Terasaki, S. Urakawa, K. Funakoshi, N. Nishiyama, Y. Wang, K. Nishida, T. Sakamaki, A. Suzuki, E. Ohtani

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   174 ( 1-4 )   220 - 226   2009.5

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    DOI: 10.1016/j.pepi.2009.01.004

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  • Density measurements of liquid FeS at high pressure using X-ray absorption image.

    Nishida, K, Suzuki, A, Terasaki, H, Ohtani, E, Sakamaki, T, Shibazaki, Y, Hayashi, H, Funayama, M, Kikegawa, T

    Photon Factory Activity Report 2007   25   198   2009.2

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  • Percolative core formation model in planet interiors Reviewed

    Hidenori Terasaki

    Japanese Magazine of Mineralogical and Petrological Sciences   38 ( 1 )   9 - 12   2009

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    DOI: 10.2465/gkk.38.9

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  • Physical properties of liquid iron-alloy under high pressure: Implications to planetary core Reviewed

    Hidenori Terasaki

    Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu   19 ( 2 )   156 - 162   2009

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    DOI: 10.4131/jshpreview.19.156

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  • Solidus of Carbonated Peridotite and petrogenesis of Magnesio-carbonatite in the Earth’s Upper Mantle and Transition Zone Reviewed

    Ghosh, S, Ohtani, E, K. Litasov, H. Terasaki

    Chemical Geology   2009

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    DOI: 10.1016/j.chemgeo.2008.12.030

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  • In situ X-ray experiment on the structure of basaltic magma under high pressure and high temperature.

    Sakamaki, T, Suzuki, A, Ohtani, E, Terasaki, H, Funakoshi, K

    SPring-8 User Experiment Report No.21 (2008A)   21   2008A1118   2008.11

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  • 高温高圧X線その場観察実験による鉄-マントル鉱物間の水素分配;火星の核-マントル境界における水素挙動の解明.

    Terasaki, H, Shibazaki, Y, Ohtani, E, Suzuki, A, Sakamaki, T, Ghosh, S, Nishida, K

    SPring-8 User Experiment Report No.21 (2008A)   21   2008A1145   2008.11

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  • X線吸収法によるペリドタイトマグマの密度測定.

    Ohtani, E, Suzuki, A, Terasaki, H, Sakamaki, T, Urakawa, S, Katayama, Y, Hayashi, H, Nakano, Y

    SPring-8 User Experiment Report No.21 (2008A)   21   2008A3722   2008.11

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  • The effect of sulfur content on density of the liquid Fe-S at high pressure Reviewed

    K. Nishida, H. Terasaki, E. Ohtani, A. Suzuki

    PHYSICS AND CHEMISTRY OF MINERALS   35 ( 7 )   417 - 423   2008.8

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    DOI: 10.1007/s00269-008-0236-4

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  • Percolative core formation in planetesimals Reviewed

    Hidenori Terasaki, Daniel J. Frost, David C. Rubie, Falko Langenhorst

    EARTH AND PLANETARY SCIENCE LETTERS   273 ( 1-2 )   132 - 137   2008.8

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    DOI: 10.1016/j.epsl.2008.06.019

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  • Phase relations of Fe-Si alloy up to core conditions: Implications for the Earth inner core Reviewed

    Hidetoshi Asanuma, Eiji Ohtani, Takeshi Sakai, Hidenori Terasaki, Seiji Kamada, Naohisa Hirao, Nagayoshi Sata, Yasuo Ohishi

    GEOPHYSICAL RESEARCH LETTERS   35 ( 12 )   L12307   2008.6

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    DOI: 10.1029/2008GL033863

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  • Interfacial tension measurement of Ni-S liquid using high-pressure X-ray micro-tomography Reviewed

    Hidenori Terasaki, Satoru Urakawa, Ken-ichi Funakoshi, Yanbin Wang, Yuki Shibazaki, Takeshi Sanehira, Yasuhiro Ueda, Eiji Ohtani

    HIGH PRESSURE RESEARCH   28 ( 3 )   327 - 334   2008

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    DOI: 10.1080/08957950802208902

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  • In situ X-ray diffraction study of Hydrogen partitioning between iron and mantle minerals under high pressure and temperature; Implications to Hydrogen behavior at the Martian core-mantle boundary

    Terasaki, H, Shibazaki Y, Ohtani E, Suzuki, A, Sakamaki T, Ghosh S, Nishida K

    SPring-8 User Experimental Report   2008

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  • Preliminary in situ determination of the solvus in the Fe-FeO system at 2-5 GPa up to 2800 K

    Asahara, Y, D.J. Frost, D.C. Rubie, A. Saikia, H. Terasaki, E. Ohtani, K. Funakoshi, T. Matsuzaki

    Annual report 2007 of Bayerisches Geoinstitut   2008

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  • Study of high pressure phases of iron-nickel-silicon alloy at multi-megabar pressure and high temperature

    Ohtani, E, Asanuma, H, Terasaki, H, Sakai, T, Kamada, S, Sawada, N, Kondo, T, Hirao, N

    SPring-8 User Experimental Report, 2008A.   2008

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  • Phase relation of Fe-Ni-S ternary system at the core pressure and temperature

    Sakai, T, Kamada, S, Terasaki, H, Ohtani, E, Asanuma, H, Hirao, N

    SPring-8 User Experimental Report, 2008A.   2008

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  • In situ observation and determination of liquid immiscibility in the Fe-O-S melt at 3 GPa using a synchrotron X-ray radiographic technique Reviewed

    Kyusei Tsuno, Hidenori Terasaki, Eiji Ohtani, Akio Suzuki, Yuki Asahara, Keisuke Nishida, Tatsuya Sakamaki, Ken-Ichi Funakoshi, Takumi Kikegawa

    GEOPHYSICAL RESEARCH LETTERS   34 ( 17 )   L17303-L17303-6   2007.9

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    DOI: 10.1029/2007GL030750

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  • Effect of structural transitions on properties of high-pressure silicate melts: Al-27 NMR, glass densities, and melt viscosities Reviewed

    Jeffrey R. Allwardt, Jonathan F. Stebbins, Hidenori Terasaki, Lin-Shu Du, Daniel J. Frost, Anthony C. Withers, Marc M. Hirschmann, Akio Suzuki, Eiji Ohtani

    AMERICAN MINERALOGIST   92 ( 7 )   1093 - 1104   2007.7

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    DOI: 10.2138/am.2007.2530

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  • Interconnectivity of Fe-O-S liquid in polycrystalline silicate perovskite at lower mantle conditions Reviewed

    Hidenori Terasaki, Daniel J. Frost, David C. Rubie, Falko Langenhorst

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   161 ( 3-4 )   170 - 176   2007.5

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    DOI: 10.1016/j.pepi.2007.01.011

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  • Post-stishovite phase transformation in hydrous oceanic crust and seismic reflectors in the lower mantle

    Litasov, K, Ohtani, E, Terasaki, H, Suzuki, A

    Spring-8 User Experimental Report   2006B1230   2007.4

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  • Determination of the phase boundary and the reaction kinetics of the post-spinel phase transition in the MgO-SiO2-H2O system

    Ohtani E, Ghosh S, Suzuki A, Litasov K, Terasaki H, Ozawa S

    Spring-8 User Experimental Report   2007A1701   2007.4

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  • Reaction between metallic iron and elta-AlOOH at the core-mantle boundary

    Ohtani, E, Kondo, T, Terasaki, H, Sano, A, Hirao, N

    Spring-8 User Experimental Report   2006B1094   2007.4

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  • In situ observation of liquid immiscibility of Fe-O-S liquid using X-ray radiography under high pressure

    Terasaki, H, Ohtani, E, Suzuki, A, Tsuno, K, Asahara, Y, Sakamaki, T, Ozawa, S, Shibazaki, Y, Ghosh, S, Litasov, K, Nishida, K, Funakoshi, K

    Spring-8 User Experimental Report   2007A1096   2007.4

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  • Search for post delta-AlOOH at multi-megabar conditions

    Ohtani E, Sano A, Terasaki H, Sakai T, Hirao N, Asanuma H

    Spring-8 User Experimental Report   2007A2090   2007.4

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  • Immiscible two-liquid regions in the Fe-O-S system at high pressure: Implications for planetary cores Reviewed

    Kyusei Tsuno, Eiji Ohtani, Hidenori Terasaki

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   160 ( 1 )   75 - 85   2007.1

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    DOI: 10.1016/j.pepi.2006.09.004

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  • メガバール領域におけるFe-Ni合金と含水相δ-AlOOHの反応:コア-マントル境界における水素の行方

    Terasaki, H, Ohtani, E, Sakai, T, Kamada, S, Asanuma, H, Sano, A, Hirao, N

    Spring-8 User Experimental Report,   2007A1731   2007

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  • Equation of state and phase relation of FeNiSi alloy to megabar pressure

    Ohtani E, Asanuma H, Sakai T, Terasaki H, Kondo T, Hirao N

    Spring-8 User Experimental Report   2007A1678   2007

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  • In-situ determination of solvus in the Fe-FeO system at high temperatures and high pressures

    Asahara, Y, Frost, D, Rubie, D, Terasaki, H, Tsuno, K, Nishida, K, Saikia, A, Ohtani, E

    Spring-8 User Experimental Report   2006B1313   2007

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  • Influence of water on phase transitions in forsterite and olivine compositions with implication to seismic discontinuities in the Earth's mantle

    Litasov, K, Ohtani, E, Ghosh, S, Terasaki, H, Suzuki, A

    Spring-8 User Experimental Report   2007A1701   2007

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  • X-ray diffraction study of basaltic liquid at high pressure and high temperature

    Sakamaki, T, Suzuki, A, Ohtani, E, Terasaki, H, Nishida

    Spring-8 User Experimental Report   2007A1095   2007

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  • Effect of pressure on the viscosity of Fe-S and Fe-C liquids up to 16 GPa Reviewed

    H. Terasaki, A. Suzuki, E. Ohtani, K. Nishida, T. Sakamaki, K. Funakoshi

    GEOPHYSICAL RESEARCH LETTERS   33 ( 22 )   L22307 - L22307   2006.11

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    DOI: 10.1029/2006GL027147

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  • Interaction between iron and post-perovskite at core-mantle boundary and core signature in plume source region Reviewed

    Takeshi Sakai, Tadashi Kondo, Eiji Ohtani, Hidenori Terasaki, Noriaki Endo, Toshiko Kuba, Toshiaki Suzuki, Takumi Kikegawa

    GEOPHYSICAL RESEARCH LETTERS   33 ( 15 )   10.1029/2006GL026868-   2006.8

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    DOI: 10.1029/2006GL026868

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  • High-temperature viscosity measurements of hydrous albite liquid using in-situ falling-sphere viscometry at 2.5 GPa Reviewed

    BT Poe, C Romano, C Liebske, DC Rubie, H Terasaki, A Suzuki, K Funakoshi

    CHEMICAL GEOLOGY   229 ( 1-3 )   2 - 9   2006.5

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    DOI: 10.1016/j.chemgeo.2006.01.010

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  • 高圧下における静滴法を用いたFe-S融体の界面エネルギー測定

    Terasaki H, Ohtani E, Suzuki A, Tsuno K, Sakamaki T, Nishida K, Asanuma H, Litasov K, Secco R, Yu X

    Spring-8 User Experimental Report   2006A   2006

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  • Influence of water on phase transition in olivine and peridotite compositions with implication to 410- and 520-km discontinuity in the transition zone

    Litasov K, Ohtani E, Suzuki A, Terasaki H

    Spring-8 User Experimental Report   2006A   2006

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  • Radiography method for the density measurement of basaltic magma at high pressure and high temperature

    Suzuki A, Ohtani E, Terasaki H, Sakamaki T, Nishida K

    Spring-8 User Experimental Report   2006A   2006

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  • Viscosity measurement of molten Fe-S-O alloy above 20 GPa

    Ohtani E, Terasaki H, Suzuki A, Tsuno K, Nishida K, Sakamaki T, Yu X, Secco R

    Spring-8 User Experimental Report   2006A   2006

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  • Viscosity of peridotite liquid up to 13 GPa: Implications for magma ocean viscosities Reviewed

    C Liebske, B Schmickler, H Terasaki, BT Poe, A Suzuki, K Funakoshi, R Ando, DC Rubie

    EARTH AND PLANETARY SCIENCE LETTERS   240 ( 3-4 )   589 - 604   2005.12

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    DOI: 10.1016/j.epsl.2005.10.004

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  • Viscosity of silicate melts in CaMgSi(2)O(6)-NaAlSi(2)O(6) system at high pressure Reviewed

    A Suzuki, E Ohtani, H Terasaki, K Funakoshi

    PHYSICS AND CHEMISTRY OF MINERALS   32 ( 2 )   140 - 145   2005.6

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    DOI: 10.1007/s00269-005-0452-0

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  • The effect of oxygen and sulphur on the dihedral angle between Fe-O-S melt and silicate minerals at high pressure: Implications for Martian core formation Reviewed

    H Terasaki, DJ Frost, DC Rubie, F Langenhorst

    EARTH AND PLANETARY SCIENCE LETTERS   232 ( 3-4 )   379 - 392   2005.4

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    DOI: 10.1016/j.epsl.2005.01.030

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  • Density of metallic liquid by X-ray radiography method at high pressure Reviewed

    Suzuki Akio, Ohtani Eiji, Terasaki Hidenori

    Abstracts of Papers Presented at the Annual Meeting of The Japanese Association of Mineralogists, Petrologists and Economic Geologists   2005 ( 0 )   92 - 92   2005

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    DOI: 10.14824/jampeg.2005.0.92.0

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  • Phase relations in peridotite-CO2 system to 20 GPa Reviewed

    Ghosh Sujoy, Ohtani Eiji, Litasov Konstantin, Suzuki Akio, Terasaki Hidenori

    Abstracts for Annual Meeting of the Mineralogical Society of Japan   2005 ( 0 )   13 - 13   2005

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    Carbon dioxide and water are the most important volatile constituents in the Earth and they produce drastic changes in the melting phase relations and partial melt composition of the mantle peridotites. Study of the peridotite-CO2 system is closely related to petrogenesis of kimberlite and diamond. There are a few high pressure mineral inclusions (i.e. majorite garnet and Ca & Mg perovskite) in diamond which suggest that kimberlites may be originated from the transition zone and lower mantle. Several experimental petrologists have studied the kimberlite and basalt-CO2 systems, however the phase relations and melt compositions in the CO2-bearing peridotite at high pressures are poorly constrained. Simplified peridotite-CO2 system (like CMS or CMAS) has been studied at pressures up to 12 GPa (Canil and Scarfe, 1990), whereas complex peridotite-CO2 systems have investigated only at lower pressures (up to 4 GPa, e.g. Wendlandt and Mysen, 1980). In this work we report the results on the phase relations and melt compositions of a model peridotite-CO2 system determined at 10-20 GPa and temperature range from 1200 to 2100oC.Our results show that solidus of carbonated peridotite is consistent with low-pressure data for CMAS-CO2 system. Liquidus phase at 10-20 GPa is majorite garnet. At 10-15 GPa, crystallization sequence with decreasing temperature is garnet, olivine and clinoenstatite. Magnesite is the most important CO2-rich phase stable in peridotite and clinoenstatite is an important phase in carbonated peridotite at 10-15 GPa.The partial melts formed by 10-25% melting at 10-20 GPa has high MgO (26-34 wt.%) and FeO (7.0-10.4 wt.%) and low SiO2 (18-36 wt.%) and Al2O3 (0.5-1.3 wt.%) contents. It contains also 6-12 wt.% CaO, 0.6-2.0 wt.% Na2O and 0.1-0.3 wt.% K2O. The CO2 contents in the melts are 14-32 wt.%. SiO2-poor composition of partial melts is different to the results for melting of anhydrous or water-bearing peridotite. Partial melting of hydrous peridotite produce SiO2-rich melts, which can be related to komatiite magmas (e.g. Litasov and Ohtani, 2002). The composition of low degree partial melts (10%) in present experiments is close to magnesiocarbonatites, whereas higher degree melting (20-25%) produce melts, which is close to kimberlite magmas.

    DOI: 10.14824/kobutsu.2005.0.13.0

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  • Immiscible two-liquid regions in the Fe-FeO-FeS system at high prebure

    Kyusei Tsuno, Eiji Ohtani, Hidenori Terasaki

    Joint 20th AIRAPT and 43rd EHPRG International Conference on High Pressure Science and Technology   2005

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  • Phase relationships and equations of state for FeS at high pressures and temperatures and implications for the internal structure of Mars Reviewed

    S Urakawa, K Someya, H Terasaki, T Katsura, S Yokoshi, KI Funakoshi, W Utsumi, Y Katayama, YI Sueda, T Irifune

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   143   469 - 479   2004.6

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    DOI: 10.1016/j.pepi.2003.12.015

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  • Viscosity of liquid sulfur under high pressure Reviewed

    H Terasaki, T Kato, K Funakoshi, A Suzuki, S Urakawa

    JOURNAL OF PHYSICS-CONDENSED MATTER   16 ( 10 )   1707 - 1714   2004.3

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    DOI: 10.1088/0953-8984/16/10/003

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  • New high-pressure viscosity determinations of NaAlSi3O8-H2O liquids

    Poe, B.T, Romano, C, Liebske, C, Terasaki, H, Rubie, D.C, Suzuki, A, Funakoshi, K

    Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik Universität Bayreuth Annual Report 2003   141 - 144   2004

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  • The viscosity of CaMgSi2O6 liquid at pressures up to 13 GPa Reviewed

    JE Reid, A Suzuki, KI Funakoshi, H Terasaki, BT Poe, DC Rubie, E Ohtani

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   139 ( 1-2 )   45 - 54   2003.9

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    DOI: 10.1016/S0031-9201(03)00143-2

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  • Determination of peridotite liquid transport properties at high pressure

    Schmickler, B, Rubie, D.C, Liebske, C, Suzuki, A, Terasaki, H, Poe, B.T

    Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik Universität Bayreuth Annual Report 2002   121 - 122   2003

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  • In situ viscosity measurements of albite melt under high pressure Reviewed

    K Funakoshi, A Suzuki, H Terasaki

    JOURNAL OF PHYSICS-CONDENSED MATTER   14 ( 44 )   11343 - 11347   2002.11

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    DOI: 10.1088/0953-8984/14/44/479

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  • Viscosity of albite melt at high pressure and high temperature Reviewed

    A Suzuki, E Ohtani, K Funakoshi, H Terasaki, T Kubo

    PHYSICS AND CHEMISTRY OF MINERALS   29 ( 3 )   159 - 165   2002.4

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    DOI: 10.1007/s00269-001-0216-4

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  • Viscosity change and structural transition of Molten Fe at 5 GPa Reviewed

    H Terasaki, T Kato, S Urakawa, K Funakoshi, K Sato, A Suzuki, T Okada

    GEOPHYSICAL RESEARCH LETTERS   29 ( 8 )   10.1029/2001GL014321-   2002.4

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    DOI: 10.1029/2001GL014321

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  • Viscosity of komatiite magma at high pressure

    Suzuki, A, Ohtani, E, Urakawa, S, Terasaki, H, Kato, T

    Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik Universität Bayreuth Annual Report 2001   105 - 106   2002

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  • The effect of temperature, pressure, and sulfur content on viscosity of the Fe-FeS melt Reviewed

    H Terasaki, T Kato, S Urakawa, K Funakoshi, A Suzuki, T Okada, M Maeda, J Sato, T Kubo, S Kasai

    EARTH AND PLANETARY SCIENCE LETTERS   190 ( 1-2 )   93 - 101   2001.7

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    DOI: 10.1016/S0012-821X(01)00374-0

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  • Radiographic study on the viscosity of the Fe-FeS melts at the pressure of 5 to 7 GPa Reviewed

    S Urakawa, H Terasaki, K Funakoshi, T Kato, A Suzuki

    AMERICAN MINERALOGIST   86 ( 4 )   578 - 582   2001.4

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  • マルチアンビルを用いた高温高圧実験-手段と装置- Reviewed

    舟越賢一, 内海渉, 大高理, 入舩徹男, 井上徹, 伊藤英司, 桂智男, 久保敦, 廣瀬敬, 安藤淳一, 鈴木昭夫, 久保友明, 寺崎英紀

    岩石鉱物科学   30   100 - 101   2001

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    DOI: 10.2465/gkk.30.100

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  • In situ determination of the phase boundary between wadsleyite and ringwoodite in Mg2SiO4 Reviewed

    A Suzuki, E Ohtani, H Morishima, T Kubo, Y Kanbe, T Kondo, T Okada, H Terasaki, T Kato, T Kikegawa

    GEOPHYSICAL RESEARCH LETTERS   27 ( 6 )   803 - 806   2000.3

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    DOI: 10.1029/1999GL008425

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  • Pictorial 3 : Large Volume High Pressure and High Temperature Apparatus Used for Synchrotron X-ray In-situ Observation

    KATO Takumi, TERASAKI Hidenori, KUBO Tomoaki

    J. Geogr.   109 ( 6 )   Plate5 - Plate5   2000

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    DOI: 10.5026/jgeography.109.6_Plate5

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  • Viscosity of melt in diopside-jadeite system at high pressure by X-ray radiograph

    Suzuki, A, Ohtani, E, Maeda, M, Sato, J, Terasaki, H, Funakoshi, K

    SPring-8 User Experiment Report No.4 (1999B)   46   2000

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  • In situ X-ray observation of the phase boundary of β- and γ-Mg2SiO4

    Suzuki, A, Kubo, T, Ohtani, E, Kanbe, Y, Okada, T, Terasaki, H, Kato, T, Kikegawa, T

    Photon Factory Activity Report   16   222   1999

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  • Precise determination of pyroxene-garnet phase equilibrium relations using in situ X-ray observation

    Okada, T, Kato, T, Terasaki, H, Kubo, T, Suzuki, A, Ohtani, E, Kikegawa, T

    Photon Factory Activity Report   16   216   1999

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  • Viscosity of basaltic silicate melt at high pressure

    Funakoshi, K, Suzuki, A, Terasaki, H, Kanzaki, M

    SPring-8 User Experiment Report No. 3 (1999A)   67   1999

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    Language:English   Publishing type:Research paper (bulletin of university, research institution)  

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Books

  • 高圧力の科学・技術事典

    入舩 徹男, 舟越 賢一, 近藤 忠, 関根 利守, 清水 克哉, 長谷川 正, 保科 貴亮, 木村 佳文, 加藤 稔, 松木 均( Role: Contributor ,  94-95;172-173)

    朝倉書店  2022.11  ( ISBN:9784254102970

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    Total pages:17,458p   Language:Japanese Book type:Dictionary, encyclopedia

    CiNii Books

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  • 基礎地学実験

    廣野哲郎, 佐伯和人, 寺崎英紀, 境家達弘, 横田勝一郎, 松尾太郎, 芝井広( Role: Contributor ,  11-18)

    学術図書出版社  2020.3  ( ISBN:9784780608236

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    Total pages:i, 42p   Language:Japanese Book type:Textbook, survey, introduction

    CiNii Books

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  • Magmas Under Pressure: Advances in High-Pressure Experiments on Structure and Properties of Melts

    Terasaki, H, K. Nishida( Role: Contributor ,  pp237–260)

    Elsevier  2018.6 

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  • Deep Earth: Physics and Chemistry of the Lower Mantle and Core

    H. Terasaki, R.A. Fischer( Role: Edit)

    AGU/Wiley  2016.4 

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MISC

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Presentations

  • 寺崎英紀、森岡康、河口沙織、近藤忠、櫻井萌、黒阪紘志、米田明、紙名宏幸

    レーザー加熱式DACを用い, 線吸収法によるNi固体, 液体の密度測定

    日本高圧力学会  2024.11.14 

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    Event date: 2024.11.13 - 2024.11.15

    Language:Japanese   Presentation type:Poster presentation  

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  • Experimental study on trapped melt in iron meteorite: Implication for the planetesimal core solidification

    H. Terasaki, S. Matsubara, T. Yoshino, G. D. Bromiley, I. Butler

    Japan Geoscience Union meeting 2024  2024.5.27 

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    Event date: 2024.5.26 - 2024.5.31

    Language:English   Presentation type:Oral presentation (general)  

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  • Wetting property of Fe–S melt in solid core: Implication to core crystallization process in planetesimals

    S. Matsubara, H. Terasaki, T. Yoshino, S. Urakawa, D. Yumitori

    Workshop on Interiors of planetesimals and terrestrial planets 

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    Event date: 2023.11.28

    Language:English   Presentation type:Oral presentation (general)  

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  • Possibility of percolative core formation in planetesimals

    H. Terasaki, T. Yoshino, G. D. Bromiley, I. Butler, K. Kobayashi, S. Matsubara, T. Miura

    Workshop on Interiors of planetesimals and terrestrial planets 

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    Event date: 2023.11.28

    Language:English   Presentation type:Oral presentation (general)  

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  • レーザー加熱式ダイヤモンドアンビルセルを用いたX線吸収法によるFeSの密度測定

    森岡康, 寺崎英紀, 紙名宏幸, 鶴岡椋, 近藤忠, 米田明, 櫻井萌, 河口沙織

    日本鉱物科学会2023年年会 

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    Event date: 2023.9.14 - 2023.9.16

    Language:Japanese   Presentation type:Poster presentation  

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  • レーザー加熱式DACとX線吸収法を組み合わせた高温高圧下でのニッケル密度測定

    寺崎英紀, 紙名宏幸, 鶴岡椋, 近藤忠, 米田明, 森岡康, 櫻井萌, 鎌田誠司, 河口沙織

    日本鉱物科学会2023年年会 

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    Event date: 2023.9.14 - 2023.9.16

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  • History of technological development of the GHz-DAC ultrasonics

    A. Yoneda, R. Tsuruoka, T. Kato, S. Kamada, H. Terasaki, T. Kondo, D. Yamazaki

    Japan Geoscience Union meeting 2023 

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    Event date: 2023.5.21 - 2023.5.26

    Language:Japanese   Presentation type:Poster presentation  

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  • 3D distribution of FeS melt in orthopyroxene mantle: Implication to core segregation in planetesimals

    H. Terasaki, T. Yoshino, G. D. Bromiley, I. B. Butler, T. Miura, S. Matsubara, K. Kobayashi

    Japan Geoscience Union meeting 2023 

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    Event date: 2023.5.21 - 2023.5.26

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  • Evaluation of Fe–S melt segregation in solid core during core crystallization in planetesimals

    S. Matsubara, H. Terasaki, T. Yoshino, S. Urakawa, K. Kobayashi, G. D. Bromiley, I. Butler

    Japan Geoscience Union meeting 2023 

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    Event date: 2023.5.21 - 2023.5.26

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  • The effect of porosity on FeS melt migration in orthopyroxene mantles in planetesimals

    K. Kobayashi, H. Terasaki, T. Yoshino, S. Matsubara, S. Urakawa, G. D. Bromiley, I. B. Butler

    Japan Geoscience Union meeting 2023 

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    Event date: 2023.5.21 - 2023.5.26

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  • Fe-FeS系合金における固液共存組織の時間と圧力変化 Invited

    寺崎英紀

    新結晶成長学シンポジウム 

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    Event date: 2023.3.28 - 2023.3.29

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • 快削性ボロン添加ダイヤモンドヒーターを用いた高温高圧発生

    辻野典秀, 寺崎英紀, 櫻井萌

    第63回高圧討論会 

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    Event date: 2022.12.13 - 2022.12.15

    Language:Japanese   Presentation type:Poster presentation  

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  • Conditions of core melt segregation in planetesimals Invited

    H. Terasaki, T. Miura, T. Yoshino, T. Kondo

    Goldschmidt Conference 

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    Event date: 2022.7.10 - 2022.7.15

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Pressure change of melting relations of the system Fe—FeS—FeO.

    K. Tsuji, S. Matsubara, H. Terasaki, S. Urakawa

    Japan Geoscience Union meeting 2022 

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    Event date: 2022.5.22 - 2022.5.27

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  • Constraint on the condition of core melt segregation in pyroxene mantle of planetary embryo

    T. Miura, H. Terasaki, T. Yoshino, S. Matsubara, O. Ohtaka, T. Kondo

    Japan Geoscience Union meeting 2022 

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    Event date: 2022.5.22 - 2022.5.27

    Language:English   Presentation type:Oral presentation (general)  

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  • Test of density measurement using X-ray absorption method combined laser-heated diamond anvil cell

    R. Tsuruoka, H. Terasaki, H. Kamina, S. Kamada, T. Kondo, A. Yoneda, N. Hirao, S. Kawaguchi

    Japan Geoscience Union meeting 2022 

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    Event date: 2022.5.22 - 2022.5.27

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  • Experimental study on the timescale of core segregation in planetesimals

    H. Terasaki, T. Miura, T. Kondo, T. Yoshino

    Japan Geoscience Union meeting 2022 

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    Event date: 2022.5.22 - 2022.5.27

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  • Development of GHz Ultrasonic Velocity Measurement in Diamond Anvil Cell: Ⅳ

    Japan Geoscience Union meeting 2022 

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    Event date: 2022.5.22 - 2022.5.27

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  • Wetting ability of liquid Fe–S in solid core during planetesimal core crystallization

    S. Matsubara, H. Terasaki, T. Yoshino, D. Yumitori, S. Urakawa

    Japan Geoscience Union meeting 2022 

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    Event date: 2022.5.22 - 2022.5.27

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  • レーザー加熱式DACを用いたX線吸収法による密度測定の試み

    寺崎英紀, 鎌田誠司, 紙名宏幸, 鶴岡椋, 近藤忠, 米田明, 河口沙織, 平尾直久

    高圧討論会 

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    Event date: 2021.10.18 - 2021.10.20

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  • GHz 音速法における技術開発続報:ダイヤモンドアンビル変形解析と測定系のインピーダンス整合

    米田 明, 鶴岡 椋, 加藤拓人, 鎌田誠司, 寺崎 英紀, 近藤 忠, 山崎 大輔

    高圧討論会 

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    Event date: 2021.10.18 - 2021.10.20

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  • GHz-DAC法による高圧下での鉄の音速測定

    鶴岡椋, 米田明, 加藤拓斗, 鎌田誠司, 寺崎英紀, 近藤忠, 山崎大輔, 平尾直久, 河口沙織

    高圧討論会 

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    Event date: 2021.10.18 - 2021.10.20

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  • Wetting property of Fe-S melt in solid iron: Implication to core crystallization in planetesimals

    D. Yumitori, H. Terasaki, T. Yoshino

    Japan Geoscience Union meeting 2021 

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    Event date: 2021.6.3 - 2021.6.6

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  • Structural study on the Ca2MgAl2Si4O14 composition melt under pressure

    N. Adachi, S. Urakawa, H. Terasaki

    Japan Geoscience Union meeting 2021 

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    Event date: 2021.6.3 - 2021.6.6

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  • GHz ultrasonic velocity measurements of iron beyond the bcc-hcp transition II: sample thickness determination using X-ray imaging method

    R. Tsuruoka, A. Yoneda, S. Kamada, H. Terasaki, T. Kondo, D. Yamazaki

    Japan Geoscience Union meeting 2021 

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    Event date: 2021.6.3 - 2021.6.6

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  • Possibility of percolation of Fe-S melts in asteroids

    T. Miura, H. Terasaki, T. Kondo, O. Ohtaka, T. Yoshino

    Japan Geoscience Union meeting 2021 

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    Event date: 2021.6.3 - 2021.6.6

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  • Deuterium content and site occupancy in iron sulphide at high pressure and high temperature: Implications for the oxidation of early Earth’s mantle

    Sumith Abeykoon, Christopher. M. Howard, Serena Dominijanni, Lisa Eberhard, Daniel J. Frost, Tiziana Boffa Ballaran, Alexander Kurnosov, Hidenori Terasaki, Tatsuya Sakamaki, Akio Suzuki, Eiji Ohtani, Asami Sano-Furukawa, Jun Abe

    Goldschmidt conference 

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    Event date: 2021

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  • レーザー衝撃圧縮を受けたシリカの高圧変成分布

    近藤忠, 大野正和, 境家達弘, 廣本健吾, 寺崎英紀, 重森啓介, 弘中陽一朗

    高圧討論会 

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    Event date: 2020.12.2 - 2020.12.4

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  • 鉄の高圧弾性:GHz-DAC 法によるP 波S 波速度測定

    米田明, 鶴岡椋, 鎌田誠司, 近藤忠, 寺崎英紀, 山崎大輔

    高圧討論会 

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    Event date: 2020.12.2 - 2020.12.4

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  • Mercury core size constrained from elastic properties of Fe-Ni-S-Si liquid

    I. Yamada, H. Terasaki, R. Tsuruoka, A. Kamiya, T. Miura, T. Kondo, Y. Tange, Y. Higo

    Japan Geoscience Union meeting 2020  2020.6.12 

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    Event date: 2020.6.12 - 2020.6.16

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  • Possibility of percolation of Fe-S melts in asteroids

    T. Miura, H. Terasaki, T. Kondo

    Japan Geoscience Union meeting 2020  2020.6.12 

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    Event date: 2020.6.12 - 2020.6.16

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  • Thermodynamic analysis of density of Fe-Ni-S melts at high pressure

    S. Urakawa, H. Terasaki, A. Machida

    Japan Geoscience Union meeting 2020  2020.6.12 

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    Event date: 2020.6.12 - 2020.6.16

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  • Density measurements of Fe up to 25 GPa based on X-ray absorption

    S. Kamada, F. Maeda, H. Terasaki, R. Tsuruoka, Y. Takubo, S. I. Kawaguchi, N. Hirao, A. Machida

    Japan Geoscience Union meeting 2020  2020.6 

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    Event date: 2020.6.12 - 2020.6.16

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  • Density a;elastic properties of liquid;gallium using externally heated diamo;anvil cell

    R. Tsuruoka, H. Terasaki, S. Kamada, F. Maeda, T. Kondo, I. Yamada, S. Urakawa, A. Yoneda, N. Hirao, S. I. Kawaguchi, N. Hirao, A. Machida

    Japan Geoscience Union meeting 2020  2020.6 

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    Event date: 2020.6.12 - 2020.6.16

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  • 高圧実験から探る惑星内部の世界 Invited

    寺崎英紀

    自然科学カフェ  2024.4.13 

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    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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Awards

  • Fellow

    2023.10   Mineralogical Society of America  

    Hidenori Terasaki

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  • 総長顕彰(研究部門)

    2015.7   大阪大学  

    寺崎 英紀

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  • Excellence in Peer Review

    2014.6   Physics and Earth Planetary Interiors, Elsevier  

    Hidenori Terasaki

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  • young scientist award

    2008.11   The Japan Society of High Pressure Science and Technology  

    Hidenori Terasaki

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  • young scientist award

    2008.9   Japan Association of Mineralogical Sciences  

    Hidenori Terasaki

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Research Projects

  • Material science and thermal structure of the Martian core and core-mantle boundary

    Grant number:25K01096  2025.04 - 2029.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    寺崎 英紀, 芳野 極, 米田 明

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    Grant amount:\25350000 ( Direct expense: \19500000 、 Indirect expense:\5850000 )

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  • Elasticity associated with the iron spin transition by means of GHz ultrasonics

    Grant number:21H01179  2021.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    米田 明, 近藤 忠, 寺崎 英紀, 山崎 大輔

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    Grant amount:\17160000 ( Direct expense: \13200000 、 Indirect expense:\3960000 )

    本研究経費を得て、以下に示す投資を行うことができた。
    ①本年度に岡山大学からGHz測定装置を大阪大学に移設し、大阪大学で大学院生と共同して研究を進める体制を整えた。②金属製の中型キャビネットを購入しGHz音速測定部を内部に置くことで外来ノイズの遮蔽を行った。この結果、従前に見られたスパイク状のノイズがほとんど観測されなくなった。③低ノイズのプレアンプを導入し、さらに、④高速電子スイッチをファンクション発振器で制御するシステムを構築し、シグナルのSN比の向上を実現した。
    この他にも、⑤ZnO圧電素子に対するインジウム電極の形状の改善と圧着状態の解明、⑥バッファロッド用基板結晶と白金電極の間に接着性改善のためのクロムのプレスパッタリング導入、など研究を安定的に進展させるための技術開発を行った。
    このような技術開発をもとにMgOの測定を行った。MgOは先行研究が多く、GHz測定の信頼性確認に最適の物質である。同一セルで初めてP波とS波の測定に成功した。圧力はSPring-8でのX線格子定数の測定から0.6GPaと決定された。試料の厚さは、回収後のガスケットの厚さから見積もった。最終的に得られたP波速度とS波速度比は1.63と先行研究と調和的結果が得られた。
    これらの成果を踏まえて、フェロペリクレースを合成しスピン転移での音速測定実施の機運が熟したといえる。そのために向けて大阪大学大学院生と協力し本研究課題達成のために邁進する。一方、前年度から継続中の鉄の音速測定も上記技術開発の結果を経て進展中である。これらの結果を含めてこれまで独自開発を行ってきたGHzーDAC音速法の技術論文を早期投稿する。

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  • Elasticity associated with the iron spin transition by means of GHz ultrasonics

    Grant number:23K20889  2021.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    米田 明, 近藤 忠, 寺崎 英紀, 山崎 大輔

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    Grant amount:\17160000 ( Direct expense: \13200000 、 Indirect expense:\3960000 )

    本課題開始後3年が経過し、66GPaでのP波トラベルタイム測定に成功した。試料はフェロペリクレース(鉄含量17%)である。今後、S波測定も同時に行い降圧過程での計測を進めていき、フェロペリクレース中の鉄イオンのスピン転移に伴う弾性異常を解明していく予定である。降圧過程で測定するのは、試料厚みを拘束するにあたってガスケットの塑性変形を最小限に抑えるためである。
    GHz-DAC音速法の圧力上限が拡大したのは、本課題において実施した様々な技術開発の総和としての結果である。シールドボックス、高性能同軸ケーブル、RFスイッチ、低ノイズアンプの導入などが測定装置面での改良で合った。スマートフォン等の生活ノイズの影響を避けるために、深夜測定をスタンダードにしたことも大きく寄与している。
    測定技術面からは、アンモニア水による洗浄、グリセリンやメタルカップラーの導入が大きく貢献した。今後はZnO圧電素子膜の性能向上をとバッファロッドとダイヤモンドアンビルの接合方法の改善を行っていく。
    直近の1年でGHz-DAC音速法の研究の拡がりを実現した。岡山大学理学部(寺崎英紀教授、分担者)にもGHz装置を立ち上げ、鉄系試料の測定を開始したところである。このテーマはコア形成過程を念頭に置いたものである。最初のテーマとしてε鉄の音速測定に取り組んでいる。
    もう一つは、水・氷試料への応用である。こちらのテーマは氷惑星・衛星を念頭においている。水・氷試料は金属酸化物より音速が遅く、GHz音速法でより測定しやすい。
    以上の成果を学会発表や論文として公表していく。

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  • Study of Martian core structure based on density and sound velocity measurements

    Grant number:20H02008  2020.04 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    寺崎 英紀, 米田 明, 鎌田 誠司

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    Grant amount:\18070000 ( Direct expense: \13900000 、 Indirect expense:\4170000 )

    本課題では、ダイヤモンドアンビルセル(DAC)を用いた密度と弾性波速度の複合測定により、Fe-Ni合金融体の密度と弾性特性を決定し、火星コア条件でのコア物質の圧縮曲線、状態方程式の決定を目指している。最近、InSight探査機による火星地震データから火星の内部構造が報告された。この最新の内部構造モデルから火星コア組成を制約するには、コア条件でのFe-S融体の状態方程式決定が不可欠となる。
    本研究では、密度測定に試料のX線透過率から密度を導出するX線吸収法を用い、弾性波速度測定にGHz超音波パルス干渉法を用いている。
    2021年度の密度測定では、両面レーザー斜入射加熱による高温高圧下の測定を本格的に実施した。Ni試料では、24 GPaまでの1600-1750 Kでの圧縮曲線を得ることができた。同時にX線回折からNiの密度を決定し、吸収法による密度と比較し整合的な結果が得られた(高圧討論会で発表)。次にFe-SとFe3C試料について測定をおこなった。液体での測定を目指すため、鉄合金試料はアルミナ単結晶圧媒体を用いて、10 GPa, 1750 KまでのX線透過率測定を行った。またX線吸収法と外熱式DACを用いた10 GPaまでの液体Gaの密度結果をHigh Pressure Research誌に発表した(Tsuruoka, Terasaki et al. 2021)。
    2021年度の弾性波速度測定では、共同研究者の米田博士によりDACを用いGHz超音波法の技術開発およびFe試料の測定を実施した。技術開発としては、低ノイズプレアンプと高速スイッチを用いることで、シグナルのSN比を向上させることができた。Fe試料の弾性波速度測定は、X線吸収測定で試料厚みを求め、6 GPaまでの圧力条件で弾性波速度を決定した。また抵抗ヒーターを用いた外熱法を採用し、高温高圧下での弾性波速度測定を開始した。

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  • Density measurements and structure of Fe and Fe-light elements alloy liquid

    Grant number:16K13902  2016.04 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Kamada Seiji, TERASAKI Hidenori

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    Grant amount:\3640000 ( Direct expense: \2800000 、 Indirect expense:\840000 )

    The Earth core is divided into liquid and solid cores. Densities of the cores were estimated seismologically and they are smaller than those of pure Fe, suggesting light elements exist in the cores. Therefore, it is very important to investigate densities of core materials. However, it is difficult to measure densities of liquid phases. In this study, I have measured densities of crystalline Fe under high pressures based on an X-ray absorption method in order to establish the method. The densities of Fe were obtained based on the X-ray absorption method and XRD. The densities of Fe based on the X-ray absorption method were consistent with those based on XRD. The difference were less than 2%. This suggests that the X-ray absorption method is a strong method to measure densities, especially liquid and amorphous.

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  • Structure and properties of the core-mantle materials

    Grant number:15H05828  2015.06 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Suzuki Akio

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    Grant amount:\186550000 ( Direct expense: \143500000 、 Indirect expense:\43050000 )

    We investigated the structure and properties of deep-Earth materials. We developed experimental techniques in collaboration with the A01-3 Group, using high pressure-temperature ultrasonic methods to measure the elastic wave velocities of hydrous and non-hydrous phases in the Earth's mantle. Moreover, we measured the velocities of silicate glasses, magmas, and metallic liquids under high pressure and temperature to study the heterogeneous structure of the Earth's deep interior. We conducted melting experiments on mantle materials under high pressure, and developed a model that attribute the chemical heterogeneity of the mantle to the transportation of ultrabasic magmas. Through the investigation of the solubility of nitrogen in silicate minerals at high pressure, we revealed that stishovite contains higher amounts of nitrogen compared to other minerals. Based on these experimental results, we proposed a new model for stishovite-transported nitrogen in the Earth's mantle and core.

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  • Composition and dynamics of Mercury and Mars cores approached from physical properties under high pressures

    Grant number:26247089  2014.04 - 2018.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Terasaki Hidenori, NISHIDA Keisuke, KONDO Tadashi, SUZUKI Akio, SASAKI Sho

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    Grant amount:\39520000 ( Direct expense: \30400000 、 Indirect expense:\9120000 )

    To clarify the core compositions of Mercury and Mars, elastic properties of liquid and solid Fe-alloys were investigated up to the planetary core conditions. We developed simultaneous sound velocity and density measurement system under high pressure and obtained relationship between sound velocity and density. It is found that the effect of alloying elements (C, S, Si, Ni) on the elastic properties of iron shows significantly different trend depending on alloying elements. Based on these results, we estimated the composition and conditions of the planetary cores.

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

    Grant number:26610141  2014.04 - 2016.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Terasaki Hidenori, SAKAIYA Tatsuhiro

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    Grant amount:\3640000 ( Direct expense: \2800000 、 Indirect expense:\840000 )

    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.

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  • Permeable flow of liquid Fe alloy through silicate grain boundary

    Grant number:23340129  2011.04 - 2015.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    URAKAWA Satoru, TERASAKI Hidenori, FUNAKOSHI Ken-ichi, UESUGI Kentaro, HASHIMOTO George

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    Grant amount:\20800000 ( Direct expense: \16000000 、 Indirect expense:\4800000 )

    At the early history of the solar system, molten iron alloy is separated from silicate mantle to form an iron core at the center of the protoplanets. We investigated this process by using high-pressure and high-temperature experiments combined with synchrotron X-ray micro computed tomography. We found that a permeable flow of liquid iron alloy through the crystalline silicate grain boundary is a dominant core-mantle separation process in the protpplanets with which the radius is smaller than several hundred km.

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  • The effect of light elements on density and elastic wave velocity of liquid Fe: Implication to light elements in the Earth's outer core

    Grant number:23340159  2011.04 - 2015.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    TERASAKI Hidenori, URAKAWA Satoru, UESUGI Kentaro, FUNAKOSHI Ken-ichi

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    Grant amount:\17680000 ( Direct expense: \13600000 、 Indirect expense:\4080000 )

    In order to clarify the effects of light elements on density and elastic wave velocity of liquid Fe-alloy and to constrain the terrestrial core compositions, we have developed simultaneous measurement system of density and sound velocity for liquid materials under pressure. Density and elastic wave velocity were obtained simultaneously for liquid Ni-S and it is found that there is a linear relationship between these two physical properties. We also obtained following results; density and sound velocity of liquid Fe-Ni-C, effect of pressure on density of Fe-C and on sound velocity of Fe-Ni-C. These results provide important aspects for understanding the effect of light elements on the elastic properties of liquid Fe.

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  • Development of neutron tomography under pressure: 3D distribution of fluid in the mantle minerals

    Grant number:23654181  2011 - 2013

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    TERASAKI Hidenori, INOUE Toru

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    Grant amount:\2860000 ( Direct expense: \2200000 、 Indirect expense:\660000 )

    In this study, we have developed neutron computed-tomography(CT) technique under high pressure in order to reveal in situ 3D distribution of H2O fluid in the mantle minerals. Newly designed heating and compress systems for CT measurement have been installed to the portable PE press. Optical set-up for neutron imaging was optimized at J-PARC neutron facility and the effects of sample material and its size on the image contrast were investigated. Neutron tomography measurement for hydrous and anhydrous mineral samples was carried out using new system. The present new system able us to perform neutron imaging and tomography measurements under high pressure and temperature

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  • Ultrahigh-Pressure Material Science of the central regions of the Earth and Planets

    Grant number:22000002  2010.04 - 2015.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Specially Promoted Research

    OHTANI Eiji, MURAKAMI Motohiko, SUZUKI Akio, TERASAKI Hidenori, HIRAO Naohisa, MIYAHARA Masaaki, FUKUI Hiroshi, SAKAI Takeshi, SAKAMAKI Tatsuya, KAMADA Seiji

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    Grant amount:\482430000 ( Direct expense: \371100000 、 Indirect expense:\111330000 )

    We determined the melting relations of Fe-S, Fe-C, Fe-H, Fe-Ni and Fe-S-Si, Fe-S-H systems, and compression of hcp-FeNiSi and hcp-FeNiS alloys, Fe_3S, and Fe3C to the core conditions. We also successfully measured compressional velocity of hcp-iron to 173 GPa at 3000 K, which are the data determined at the highest pressure and temperature by the IXS method. We also determined the spin-state and magnetic properties of the iron-oxides and iron-light element compounds at high pressure. Based on these experimental results we proposed the model of the composition and the temperature profile of the core.

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  • Physical property and structure of magma under high pressure, and the effect of water

    Grant number:20103003  2008 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    INOUE Toru, URAKAWA Satoru, URAKAWA Satoru, SUZUKI Akio, MIBE Kenji, KAWAMOTO Tatsuhiko, ARIMA Hiroshi, KAWAMOTO Tatsuhiko, FUNAKOSHI Ken-ichi, FUNAMORI Nobumasa, TERASAKI Hidenori, NAKAMURA Michihiko, YAMADA Akihiro

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    Grant amount:\97890000 ( Direct expense: \75300000 、 Indirect expense:\22590000 )

    We have developed the cell assembly for high temperature high-pressure neutron experiment and also installed a neutron camera with various examinations together with construction of the high temperature high-pressure neutron beamline in J-PARC. In addition, we have performed experimental studies about the effect of water and the structure and the physical properties of magma generated in the Earth interior by in-situ synchrotron X-ray observation and quench experiment under high temperature and high pressure. The high temperature and high-pressure neutron experiment was enabled by this project research, and new knowledge, such as structure of magma, density, and viscosity, was acquired.

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  • X線トモグラフィー用高温高圧装置の開発

    Grant number:19654082  2007 - 2008

    日本学術振興会  科学研究費助成事業  萌芽研究

    浦川 啓, 舟越 賢一, 寺崎 英紀, 上杉 健太朗

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    Grant amount:\3400000 ( Direct expense: \3400000 )

    X線マイクロトモグラフィを使った高温高圧下における3次元イメージングからは試料の形状,体積,界面などの情報が非破壊で得られるため,高圧力科学の分野の応用性を広める技術である。我々はその地球科学的な応用研究をアメリカ合衆国の放射光施設Advanced Photon Source(APS)で行った(平成18〜19年度)。本研究では,そのときの経験をもとにX線マイクロトモグラフィ用に新しい高圧装置を開発した。平成19年度に作製した高圧装置はSPring-8のイメージング用ビームラインで使用することを念頭に設計され,総重量30kg最大荷重80トンの小型のものである。平成20年度はこの小型高圧装置の性能評価を兼ねてX線マイクロトモグラフィ実験をSPring-8のBL20B2で行った。再構築したCTイメージには高圧装置のフレームに起因する影が認められるが,形状は柱のない場合と解像度の範囲内では一致した。圧力4GPa温度1000Kまでの実験でも十分に可視領域が確保され内部のCT像を得ることが可能であった。このように所定の性能を発揮することを確認した。APSにおけるX線マイクとトモグラフィと比較すると,高圧装置の加圧能力は約2倍,データ収集時間は1/10以下,解像度は2倍程度,我々の方が優れていた。SPring-8とAPSではビームラインのスペックの差もあるが非常に満足の出来る結果であった。高圧装置は高輝度光科学研究センターに寄付されており,共同利用が可能である。

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  • Structure and Evolution of the Earth's Core

    Grant number:18104009  2006 - 2009

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    OHTANI Eiji, SUZUKI Akio, TERASAKI Hidenori, KONDO Tadashi, KIKEGAWA Takumi, MIYAHARA Masaaki

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    Grant amount:\105040000 ( Direct expense: \80800000 、 Indirect expense:\24240000 )

    We have clarified the phase and melting relations of the iron-light element systems to the earth's core conditions, the reactions of metallic iron and silicates at the core-mantle boundary, and the physical properties of metallic melts at high pressure. Using these data, we discussed the mechanism of the core formation and the nature and properties of the Earth's core.

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  • 月及び火星からの隕石飛来機構の解明

    Grant number:18654091  2006 - 2007

    日本学術振興会  科学研究費助成事業  萌芽研究

    大谷 栄治, 木村 眞, 寺崎 英紀, 高山 和喜

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    Grant amount:\3200000 ( Direct expense: \3200000 )

    本研究では,火星阻石や月起源の隕石の構成鉱物の同定を行い,そこに含まれる鉱物に認められる衝撃組織,焼結組織を記載し,コンドライト隕石の衝撃溶融脈に認められる衝撃組織との違いを明らかにすることを目的にしている.
    本年度は,本研究を実施するために,備品としてカーボンコーターを導入した.これによって,走査電子顕微鏡,EPMAの試料の蒸着が迅速簡便に行うことが可能になった.火星隕石(シャゴッタイト)の衝撃波組織の顕微鏡観察,走査電子顕微鏡観察,ラマン分光測定を開始した.さらに透過電子顕微鏡観察用にFIB(収束イオンビームシステム)を用いた隕石試料の加工法の確立を目指した.月火星隕石の衝撃波組織との比較を行うために比較的容易に手に入れることができるコンドライト隕石の衝撃波溶融脈中の衝撃波組織の詳細な記載方法の検討を行った.また,この衝撃波組織について,透過電子顕微鏡観察により,衝撃波による相転移相の組織観察と分析電子顕微鏡による組成分析を試みた.また,コンドライト隕石中のリン酸塩鉱物を用いて,衝撃年代が得られるか否かの予備的測定を広島大学の寺田博士の協力のもとで行なった.以上の実験によって,月・火星隕石の透過顕微鏡観察と微細スケールでの解析分析の方法がほぼ確立できた.

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  • 火星中心核までの高圧力条件における鉄合金メルトの粘性測定

    Grant number:17740343  2005 - 2006

    日本学術振興会  科学研究費助成事業  若手研究(B)

    寺崎 英紀

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    Grant amount:\3700000 ( Direct expense: \3700000 )

    惑星中心核の物性や初期惑星内部における核形成過程を理解するためには、広範な温度圧力領域における核構成物質の粘性測定を行うことが重要である。本研究では、中心核を構成するとされる鉄-軽元素系合金のうち、有力な軽元素と考えられる硫黄、炭素に注目し、Fe-S, Fe-C融体の粘性を、世界最高の測定条件である16 GPa,1843Kまでの温度・圧力条件で測定することに成功した。実験は、大型放射光雄設SPring-8ビームライン04B1のマルチアンビル高圧装置を用い、試料中のマーカー球の落下速度、をCCDカメラによりその場観察するX線影像落球法を用いて粘性測定を行った。高圧発生用に開発した超硬アンビルの朱端サイズ5mmのセルを用いた。ヒーター材質乏しては、肉厚を薄く加工したランタンクロマイドを使用した。また粘性マーカーのRe球と鉄合金試料との化学反応を防ぐために、RFスパッタ装置を用いて、Re球を厚さ1-2ミク-ロンのアルミナでコーティングした。このように碓立された高圧セルを用いて、取り込み速度が最高125プレーム/秒の高速度カメラと組み合わせることにより、Fe-S, Fe-Cメルトの粘性を測定し、その圧力依存性を精度良く求めることができた。
    Fe-S共融組成メルトは、16 GPa,1798Kまでの温度・圧力条件において、粘性係数は3.2-8.6 Pa-sとなり、その圧力依存性すなわち粘性流動の活性化体積は、1.46cm^3/molと非常に小さいことが明らかとなった。一方、Fe-Cメルトについては、4.5GPa,1843Kまでの条件において、粘性係数は1.7・7-6 Pa-sとなり、その活性化体積は1.20cm^3/molということがわかった。これにより、Fe-S, Fe-Cメルトの粘性の圧力依存性は、いずれも小さく、大差ないことが明らかとなり、惑星内部においても核メルトの粘性は非常に小さいと推測される。

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  • X線影像を用いた高圧下におけるマグマの密度測定法の開発

    Grant number:17654102  2005 - 2006

    日本学術振興会  科学研究費助成事業  萌芽研究

    鈴木 昭夫, 大谷 栄治, 近藤 忠, 寺崎 英紀

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    Grant amount:\3100000 ( Direct expense: \3100000 )

    惑星の内部構造やダイナミクスを理解する上で鉄合金融体の密度は基本的な物性値である。しかしながら、現在まで高圧下での鉄合金融体の密度測定は数例しか行われていない。浮沈法を用いたFe-S融体の密度測定Balog et al.(2003)やNishida et al.(submitted)で行われている。X線吸収法によるFe-S(S=10,20,and 27wt%)融体の密度測定は圧力が1.5-6.2GPa、温度が1500-1780K範囲で(Sanloup et al. 2000)によって行われている。本研究では,X線吸収コントラストイメージを用いて密度測定を行った。この方法は透過X線強度がX線吸収コントラストイメージの明るさに比例する原理に基づいており、1度の露光で試料を通過した2次元の透過X線強度の情報を得ることができるのが利点である。
    本研究ではFeS融体の密度をKEK-PFのBL14C2において5GPa、1900Kまでの条件で密度測定を行った。1.3GPa、1600KにおけるFeS融体の密度は4.23g/cm^3であった。本研究で得られた1.3GPa-1600KのFeS融体の密度と4.2GPa-1573Kの密度(Chen et al. 2005)と1atm-1600Kの密度(Kaiura et al.,1979)を用いて得られた等温体積弾性率(K_T)はK'が4から6の範囲でおのおの12.3から14.6GPaであった。
    本研究によって、X線イメージを用いる密度測定法が、従来のX線吸収法の限界であった圧力を大幅に拡大できるものであることが明らかとなった。

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  • Modeling of slab stagnation and falling processes

    Grant number:16075202  2004 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Priority Areas

    OHTANI Eiji, SUZUKI Akio, TERESAKI Hidenori, NAGASE Toshio, HIROSE Kei, MURAKAMI Motohiko, SAKAI Takeshi, KONDO Tadashi, KUBO Tomoaki, KOMIYA Tsuyoshi, OOISHI Yasuo

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    Grant amount:\258200000 ( Direct expense: \258200000 )

    水の存在下でマントル遷移層の相転移境界の深さが変化する。揮発性物質を含むマグマの密度測定によると、このマグマが上部マントル最下部で安定である。これらの結果から滞留した深部スラブからの脱水と上部マントル下部での重い含水マグマの生成というDeep Dehydration modelを提案した。パイロライトやMORB組成中のポストペロフスカイト相転移境界を決定し、D"不連続面の成因をあきらかにした。下部マントル全域でMORB成分はカンラン岩成分より重く、核マントル境界にMORB成分が堆積する。

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  • Experimental study on the melting relation of silicate under the lowermost mantle condition

    Grant number:16340164  2004 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KONDO Tadashi, OHTANI Eiji, SUZUKI Akio, TERASAKI Hidenori

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    Grant amount:\16500000 ( Direct expense: \16500000 )

    In this research project, we investigated the phase relation of the minerals under the lowermost mantle condition and the chemical reaction between those minerals and molten iron up to the condition corresponding to the earth's core-mantle boundary. For realizing such extreme conditions, we newly designed a symmetrical diamond anvil cell with a wide conical window for laser-heating and optical spectroscopy. The laser-heating system was also refined for stable heating and optimal temperature measurement from the hot sample by a spectroradiometric method. Experiments were performed using these techniques at SPring-8 and Photon Factory for in-situ X-ray diffraction measurements at high P-T, and also at laboratory for recovery runs to check the quenched samples. Thanks for the recent advances in micro-processing technologies such as laser cutting, focused ion beam, we successfully prepared the thin section of the recovered samples for analytical transmission electron microscopy. Finally we obtained the following results. (1) The chemical reaction between molten iron and perovskite and post-perovskite phase and wetting property at the core-mantle boundary condition was examined, and silicon and oxygen turned to be important candidates as light elements in the outer core. The wetting angle between post-perovskite phase and molten iron was slightly higher than the critical angle of 60°, which means 2wt% of the core material can be trapped in the D" layer. (2) Magnesiowustite is the heaviest minerals overall the mantle based on the iron partitioning experiments between magnesium oxide and silicate perovskite and post-perovskite phase. No evidence for the effect of a high-spin to low-spin transition was found in these minerals. (3) Potassium can be dissolved into molten iron significantly at core-mantle boundary condition, and the element may work as a heat source in the core. (4) The hydrous mineral, delta-AIOOH, has a wide stability field over 100GPa and 2000K, therefore this phase at relatively low temperature condition in descending slab possibly survive to the lowermost mantle to supply the water to core-mantle boundary. (5) Potassium bearing silicate with post-hollandite structure can be stably exist at the lowermost mantle condition.

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  • 巨大惑星の内部構造に関する実験的研究

    Grant number:16654083  2004 - 2005

    日本学術振興会  科学研究費助成事業  萌芽研究

    近藤 忠, 大谷 栄治, 鈴木 昭夫, 寺崎 英紀

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    Grant amount:\3500000 ( Direct expense: \3500000 )

    本年度は、木星・土星の主成分と考えられる水素-ヘリウム系の混合ガスを使った高圧実験を行った。初期組成でH_2:He=1:1及びH_2:He=3:1の混合ガスを用意し、昨年度開発したダイヤモンドアンビルセルにガス試料を充填した。各試料について高圧下での相変化を顕微鏡下で観察し、各相のラマン散乱測定を行った。顕微鏡下の相変化観察では5.8GPaから均一流体相が水素濃集相とヘリウム濃集相の二流体相に分離し、6.5GPaで水素濃集相が固化する様子が観察された。更に加圧を続けると、ヘリウム相に対する水素溶解度が低下によると見られる、水素濃集粒子が内部に析出するのが見られた。ラマン散乱の結果からは、水素分子の伸縮運動に対応するQ1モードの圧力シフト、転移に伴う周波数の不連続変化が見られ、ヘリウム濃集相中のQ1が12.9GPaで消失する事が分かった。これは、顕微鏡観察では確認できなかったヘリウム濃集相の固化に対応すると考えられ、これらの測定はH_2:He=1:1の試料で30GPaまで、H_2:He=3:1の試料で17GPaまで行われた。以上から、固化したヘリウムに対して水素は殆ど溶解せず、高圧下では固体二相に分離すると考えられる。また、H_2:He=1:1とH_2:He=3:1の試料では、ラマンの圧力シフト量及び勾配が異なり、ヘリウム濃度依存を確認したが、過去に報告のある組成とラマンシフトの関係式とは一致しないことが分かった。本研究の結果は、過去に報告のある12GPaまでのデータに比べ2倍以上の高圧力まで観測を行い、ヘリウム固体相に対する水素の固溶量が検出限界以下であること、ラマンシフトの組成依存に関し再較正が必要なことを示した点で新しい。以上の結果は2006年度地球惑星科学関連合同大会及び、国際鉱物学会議(IMA-神戸)で報告されると共に、国際誌への投稿を準備中である。

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  • Ultra-high Pressure Earth Science of the Core and Core-Mantle Boundary

    Grant number:14102009  2002 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    OHTANI Eiji, KONDO Tadashi, SUZUKI Akio, KUDO Tomoaki, TERASAKI Hidenori

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    Grant amount:\99580000 ( Direct expense: \76600000 、 Indirect expense:\22980000 )

    In this study we clarified the reactions occurring at the Core-Mantle boundary and structure and properties of the Earth's Core using two types of apparatuses such as a diamond anvil cell and multianvil apparatus.
    The results can be summarized as follows :
    1.We clarified the reactions between metallic iron and water up to 84 GPa and high temperatures. At pressures above 10 GPa and temperatures above 1000K, Iron and water react to form iron hydrite and iron oxide. This reaction is important during the core formation stage and at the present core-mantle boundary. This result implies that hydrogen can be incorporated into the Earth core.
    2.We have studied experimentally the reactions between metallic iron and perovskite and post-perovskite in the pressure range from 30 to 135 GPa at 3000 K which is the real Core-mantle boundary condition. We observed formation of magnesiowusite and dissolution of Si and 0 into the molten iron under the present pressure and temperature conditions. The solubility of these elements increases with increasing pressure and temperature significantly.
    3.We studied the dissolution of potassium into the molten iron under the Core conditions of 135 GPa and 3500 K. Molten iron dissolves potassium about 0.8 wt. %, and the present results showed at first that the core can contain radiogenic potassium and can produce some radiogenic heat.

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