Details of the Researcher

PHOTO

Tatsuya Sakamaki
Section
Graduate School of Science
Job title
Assistant Professor
Degree

  • 理学博士 (Tohoku University)

e-Rad No.
30630769

Committee Memberships 4

  • 日本高圧力学会　評議員

    2020/10 - 2022/10

  • 一般社団法人日本鉱物科学会　選挙管理委員会 委員

    2017/09 - 2020/09

  • High-Pressure Earth and Planetary Science in the last and next decade (Progress in Earth and Planetary Science)　編集委員

    2015/04 - 2016/09

  • High-Pressure Earth and Planetary Science in the last and next decade (Progress in Earth and Planetary Science)　編集委員

    2015/04 - 2016/09

Professional Memberships 4

  • 日本地球惑星科学連合

  • Japan Association of Mineralogical Sciences

  • The Japan Society of High Pressure Science and Technology

  • American Geophysical Union

Research Interests 3

  • high temperature

  • high pressure

  • magma

Research Areas 1

  • Natural sciences / Solid earth science /

Awards 6

  1. Nishida Prize

    2025/05　Japan Geoscience Union　Structure and physical properties of materials in the Earth and planetary interiors based on high-pressure experimental petrology

  2. The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology, The Young Scientists’ Award

    2022/04　Ministry of Education, Culture, Sports, Science and Technology

  3. SPRUC 2017 Young Scientist Award

    2017/09　SPring-8ユーザー協同体

  4. 日本鉱物科学会研究奨励賞（第19回）

    2016/09　日本鉱物科学会

  5. 2014年度日本高圧力学会奨励賞

    2014/11　日本高圧力学会

  6. 第27回井上研究奨励賞受賞

    2011/02/04　公益財団法人井上科学振興財団

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Papers 85

  1. High Pressure Melts

    Tatsuya Sakamaki, Eiji Ohtani

    Reviews in Mineralogy and Geochemistry　87　(1)　557-574　2022/05/01

    Publisher: Mineralogical Society of America

    DOI： 10.2138/rmg.2022.87.11 　

    ISSN： 1529-6466

  2. Structure of basaltic glass at pressures up to 18 GPa

    Tomonori Ohashi, Tatsuya Sakamaki, Ken-ichi Funakoshi, Takanori Hattori, Naoki Hisano, Jun Abe, Akio Suzuki

    American Mineralogist　107　(3)　325-335　2022/03/01

    Publisher: Mineralogical Society of America

    DOI： 10.2138/am-2021-7742 　

    ISSN： 0003-004X

    eISSN： 1945-3027

    More details Close

    Abstract The structures of cold-compressed basaltic glass were investigated at pressures up to 18 GPa using in situ X-ray and neutron diffraction techniques to understand the physicochemical properties of deep magmas. On compression, basaltic glass changes its compression behavior: the mean O-O coordination number (CNOO) starts to rise while maintaining the mean O-O distance (rOO) above about 2–4 GPa, and then CNOO stops increasing, and rOO begins to shrink along with the increase in the mean coordination number of Al (CNAlO) above ~9 GPa. The change around 9 GPa is interpreted by the change in contraction mechanism from bending tetrahedral networks of glass to increasing oxygen packing ratio via the increase in CNAlO. The analysis of the oxygen packing fraction (ηO) under high pressure reveals that ηO exceeds the value for dense random packing, suggesting that the oxygen-packing hypothesis recently proposed cannot account for pressure-induced structural transformations of silica and silicate glasses. The rise of the CNOO at 2–4 GPa reflects the elastic softening of fourfold-coordinated silicate glass, which may be the origin of anomalies of elastic moduli in basaltic glass at ~2 GPa previously reported by Liu and Lin (2014). The widths of both the first sharp diffraction peak and the principal peak show contrastive compression behaviors between modified silicate and silica glasses. This result suggests that modified silicate glasses represent different pressure evolutions in the intermediate- and extended-range order structures from those of silica glass, likely due to the presence of modifier cations and the resultant formations of smaller rings and cavity volume.

  3. Elastic properties and structures of pyrope glass under high pressures

    Naoki Hisano, Tatsuya Sakamaki, Tomonori Ohashi, Ken-ichi Funakoshi, Yuji Higo, Yuki Shibazaki, Akio Suzuki

    American Mineralogist　106　(1)　7-14　2021/01/01

    Publisher: Mineralogical Society of America

    DOI： 10.2138/am-2020-7410 　

    ISSN： 0003-004X

    eISSN： 1945-3027

  4. The sound velocity of wüstite at high pressures: implications for low-velocity anomalies at the base of the lower mantle Peer-reviewed

    Ryosuke Tanaka, Tatsuya Sakamaki, Eiji Ohtani, Hiroshi Fukui, Seiji Kamada, Akio Suzuki, Satoshi Tsutsui, Hiroshi Uchiyama, Alfred Q. R. Baron

    Progress in Earth and Planetary Science　7　(1)　2020/12

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40645-020-00333-3 　

    eISSN： 2197-4284

  5. Effects of alkali and alkaline-earth cations on the high-pressure sound velocities of aluminosilicate glasses Peer-reviewed

    Koji Aoki, Tatsuya Sakamaki, Tomonori Ohashi, Osamu Ikeda, Akio Suzuki

    Physics and Chemistry of Minerals　47　(6)　2020/06

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s00269-020-01098-3 　

    ISSN： 0342-1791

    eISSN： 1432-2021

  6. Hydrous magnesium-rich magma genesis at the top of the lower mantle Peer-reviewed

    Ayano Nakajima, Tatsuya Sakamaki, Takaaki Kawazoe, Akio Suzuki

    Scientific Reports　9　(1)　2019/12/01

    DOI： 10.1038/s41598-019-43949-2 　

    eISSN： 2045-2322

  7. Sound velocity measurements of ε-FeOOH up to 24 GPa Peer-reviewed

    Osamu Ikeda, Tatsuya Sakamaki, Tomonori Ohashi, Masahisa Goto, Yuji Higo, Akio Suzuki

    Journal of Mineralogical and Petrological Sciences　114　(3)　155-160　2019

    DOI： 10.2465/jmps.181115b 　

    ISSN： 1345-6296

    eISSN： 1349-3825

  8. Pressure-induced structural changes of basaltic glass Peer-reviewed

    Tomonori Ohashi, Tatsuya Sakamaki, Ken Ichi Funakoshi, Akio Suzuki

    Journal of Mineralogical and Petrological Sciences　113　(6)　286-292　2018/12/01

    DOI： 10.2465/jmps.171114a 　

    ISSN： 1345-6296

    eISSN： 1349-3825

  9. Sound velocity measurements of hcp Fe-Si alloy at high pressure and high temperature by inelastic X-ray scattering Peer-reviewed

    Takanori Sakairi, Tatsuya Sakamaki, Eiji Ohtani, Hiroshi Fukui, Seiji Kamada, Satoshi Tsutsui, Hiroshi Uchiyama, Alfred Q.R. Baron

    American Mineralogist　103　(1)　85-90　2018/01/26

    Publisher: Walter de Gruyter GmbH

    DOI： 10.2138/am-2018-6072 　

    ISSN： 1945-3027 0003-004X

  10. Structure and Properties of Silicate Magmas

    Tatsuya Sakamaki

    Magmas Under Pressure　323-341　2018

    Publisher: Elsevier

    DOI： 10.1016/b978-0-12-811301-1.00012-5 　

  11. Density of hydrous magma Peer-reviewed

    Tatsuya Sakamaki

    CHEMICAL GEOLOGY　475　135-139　2017/12

    DOI： 10.1016/j.chemgeo.2017.11.012 　

    ISSN： 0009-2541

    eISSN： 1878-5999

  12. Density of jadeite melts under high pressure and high temperature conditions Peer-reviewed

    Tatsuya Sakamaki

    JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES　112　(5)　300-307　2017/10

    DOI： 10.2465/jmps.170128 　

    ISSN： 1345-6296

    eISSN： 1349-3825

  13. Preface for the article collection "High-Pressure Earth and Planetary Science in the last and next decade" Peer-reviewed

    Tatsuya Sakamaki, Akio Suzuki, Bjorn Mysen

    PROGRESS IN EARTH AND PLANETARY SCIENCE　3　2016/12

    DOI： 10.1186/s40645-016-0114-5 　

    ISSN： 2197-4284

  14. Constraints on Earth's inner core composition inferred from measurements of the sound velocity of hcp-iron in extreme conditions Peer-reviewed

    Tatsuya Sakamaki, Eiji Ohtani, Hiroshi Fukui, Seiji Kamada, Suguru Takahashi, Takanori Sakairi, Akihiro Takahata, Takeshi Sakai, Satoshi Tsutsui, Daisuke Ishikawa, Rei Shiraishi, Yusuke Seto, Taku Tsuchiya, Alfred Q. R. Baron

    SCIENCE ADVANCES　2　(2)　2016/02

    DOI： 10.1126/sciadv.1500802 　

    ISSN： 2375-2548

  15. Contrasting sound velocity and intermediate-range structural order between polymerized and depolymerized silicate glasses under pressure Peer-reviewed

    Tatsuya Sakamaki, Yoshio Kono, Yanbin Wang, Changyong Park, Tony Yu, Zhicheng Jing, Guoyin Shen

    EARTH AND PLANETARY SCIENCE LETTERS　391　288-295　2014/04

    DOI： 10.1016/j.epsl.2014.02.008 　

    ISSN： 0012-821X

    eISSN： 1385-013X

  16. Contrasting behavior of intermediate-range order structures in jadeite glass and melt Peer-reviewed

    Tatsuya Sakamaki, Yanbin Wang, Changyong Park, Tony Yu, Guoyin Shen

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS　228　281-286　2014/03

    DOI： 10.1016/j.pepi.2014.01.008 　

    ISSN： 0031-9201

    eISSN： 1872-7395

  17. Atomistic insight into viscosity and density of silicate melts under pressure Peer-reviewed

    Yanbin Wang, Tatsuya Sakamaki, Lawrie B. Skinner, Zhicheng Jing, Tony Yu, Yoshio Kono, Changyong Park, Guoyin Shen, Mark L. Rivers, Stephen R. Sutton

    NATURE COMMUNICATIONS　5　2014/01

    DOI： 10.1038/ncomms4241 　

    ISSN： 2041-1723

  18. Ponded melt at the boundary between the lithosphere and asthenosphere Peer-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

    DOI： 10.1038/NGEO1982 　

    ISSN： 1752-0894

    eISSN： 1752-0908

  19. Structure of jadeite melt at high pressures up to 4.9 GPa Peer-reviewed

    Tatsuya Sakamaki, Yanbin Wang, Changyong Park, Tony Yu, Guoyin Shen

    JOURNAL OF APPLIED PHYSICS　111　(11)　112623　2012/06

    DOI： 10.1063/1.4726246 　

    ISSN： 0021-8979

  20. Density of carbonated peridotite magma at high pressure using an X-ray absorption method Peer-reviewed

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

    AMERICAN MINERALOGIST　96　(4)　553-557　2011/04

    DOI： 10.2138/am.2011.3577 　

    ISSN： 0003-004X

  21. Density of high-Ti basalt magma at high pressure and origin of heterogeneities in the lunar mantle Peer-reviewed

    Tatsuya Sakamaki, Eiji Ohtani, Satoru Urakawa, Akio Suzuki, Yoshinori Katayama, Dapeng Zhao

    EARTH AND PLANETARY SCIENCE LETTERS　299　(3-4)　285-289　2010/11

    DOI： 10.1016/j.epsl.2010.09.007 　

    ISSN： 0012-821X

  22. Density of dry peridotite magma at high pressure using an X-ray absorption method Peer-reviewed

    Tatsuya Sakamaki, Eiji Ohtani, Satoru Urakawa, Akio Suzuki, Yoshinori Katayama

    AMERICAN MINERALOGIST　95　(1)　144-147　2010/01

    DOI： 10.2138/am.2010.3143 　

    ISSN： 0003-004X

  23. Measurement of hydrous peridotite magma density at high pressure using the X-ray absorption method Peer-reviewed

    Tatsuya Sakamaki, Eiji Ohtani, Satoru Urakawa, Akio Suzuki, Yoshinori Katayama

    EARTH AND PLANETARY SCIENCE LETTERS　287　(3-4)　293-297　2009/10

    DOI： 10.1016/j.epsl.2009.07.030 　

    ISSN： 0012-821X

  24. Stability of hydrous melt at the base of the Earth's upper mantle Peer-reviewed

    T Sakamaki, A Suzuki, E Ohtani

    NATURE　439　(7073)　192-194　2006/01

    DOI： 10.1038/nature04352 　

    ISSN： 0028-0836

  25. Elastic wave velocity and density of fcc-Fe and fcc-Fe–Si alloys at high pressures and temperatures

    Masaya Kumagai, Tatsuya Sakamaki, Osamu Ikeda, Sho Kakizawa, Noriyoshi Tsujino, Yuji Higo, Akio Suzuki

    Physics of the Earth and Planetary Interiors　107455-107455　2025/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.pepi.2025.107455 　

    ISSN： 0031-9201

  26. Formation of triclusters in silica melt under high pressure

    Hayafune Shino, Sakamaki Tatsuya, Ichikawa Haruki, Onodera Yohei, Kohara Shinji, Suzuki Akio

    Journal of the Ceramic Society of Japan　133　(6)　242-245　2025/06/01

    Publisher: The Ceramic Society of Japan

    DOI： 10.2109/jcersj2.25042 　

    ISSN： 1882-0743 1348-6535

    eISSN： 1348-6535

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    Silica (SiO2) is the major glass-forming material, and the structures of silica glass and melt have been extensively studied using X-ray and neutron diffraction techniques. The diffraction data of silica glass and melt show the first sharp diffraction peak (FSDP) at Q ∼ 1.5 Å−1, which is a signature of intermediate-range order. In this study, we performed classical molecular dynamics (MD) simulations at 2000 K and 5 GPa to understand the behaviour of the diffraction peak associated with the modification of intermediate-range order. The high-pressure melt data obtained show the decrease in the height of FSDP with a shift of the peak position to the high-Q side in X-ray diffraction data, although the average coordination number of four was maintained. In addition, we observed the formation of OSi3 triclusters, which share an oxygen atom with a SiO4 tetrahedron. This unusually dense packed atomic arrangement is the result of high pressure and is associated with the very sharp principal peak observed at Q ∼ 3 Å−1 in the O–O partial structure factor derived by MD simulation.

  27. Structural Analysis of Silicate Glasses and Melts under High Pressure and High Temperature Conditions Based on Synchrotron X-ray and Neutron Diffraction Experiments

    Tatsuya SAKAMAKI

    Nihon Kessho Gakkaishi　2025/05/31

    DOI： 10.5940/jcrsj.67.133 　

  28. Effects of CO2 on the structure of silicate melts considering the degree of polymerization under pressure

    Shino HAYAFUNE, Tatsuya SAKAMAKI, Haruki ICHIKAWA, Yohei ONODERA, Shinji KOHARA, Ken-ichi FUNAKOSHI, Akio SUZUKI

    120　(1)　2025/03/17

    DOI： 10.48505/nims.5456 　

    ISSN： 1345-6296

  29. Hydrogen in the Earth core inferred from neutron imaging and diffraction

    Naoki Takahashi, Tatsuya Sakamaki, Takanori Hattori, Ken-ichi Funakoshi, Hiroshi Arima-Osonoi, Asami Sano-Furukawa, Jun Abe, Akio Suzuki

    2025/03/10

    DOI： 10.21203/rs.3.rs-6011893/v1 　

  30. The magnetism and elasticity of ϵ-FeOOH across the pressure-induced electronic spin transition

    Osamu Ikeda, Tatsuya Sakamaki, Takaya Mitsui, Kosuke Fujiwara, Hiroshi Uchiyama, Hiroshi Fukui, Daisuke Ishikawa, Alfred Q.R. Baron, Akio Suzuki

    High Pressure Research　1-15　2025/02/18

    Publisher: Informa UK Limited

    DOI： 10.1080/08957959.2025.2466147 　

    ISSN： 0895-7959

    eISSN： 1477-2299

  31. High-Pressure Neutron Diffraction Study on ε-FeOOH: The Spin-Reorientation Transition and Hydrogen-Bond Symmetrization

    Osamu Ikeda, Hajime Yamamoto, Asami Sano-Furukawa, Tatsuya Sakamaki, Takahiro Kuribayashi, Yukio Noda, Akio Suzuki

    Journal of the American Chemical Society　2025/01/23

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/jacs.4c11982 　

    ISSN： 0002-7863

    eISSN： 1520-5126

  32. Pressure-induced elongation of hydrogen-oxygen bond in sodium silicate melts

    Tomonori OHASHI, Tatsuya SAKAMAKI, Ken-ichi FUNAKOSHI, Gerd STEINLE-NEUMANN, Takanori HATTORI, Liang YUAN, Akio SUZUKI

    Journal of Mineralogical and Petrological Sciences　120　(1)　n/a-n/a　2025

    Publisher: Japan Association of Mineralogical Sciences

    DOI： 10.2465/jmps.240926a 　

    ISSN： 1345-6296

    eISSN： 1349-3825

  33. Elastic wave velocity measurements of sodium aluminosilicate glass and melt at high pressure and temperature

    Naoki Takahashi, Tatsuya Sakamaki, Osamu Ikeda, Sho Kakizawa, Yuji Higo, Akio Suzuki

    Physics of the Earth and Planetary Interiors　107167-107167　2024/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.pepi.2024.107167 　

    ISSN： 0031-9201

  34. Deuterium Content and Site Occupancy in Iron Sulfide at High Pressure and Temperature Determined Using In Situ Neutron Diffraction Measurements

    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)　2023/09/21

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2023jb026710 　

    ISSN： 2169-9313

    eISSN： 2169-9356

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    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.

  35. Density deficit of Earth’s core revealed by a multimegabar primary pressure scale

    Daijo Ikuta, Eiji Ohtani, Hiroshi Fukui, Tatsuya Sakamaki, Rolf Heid, Daisuke Ishikawa, Alfred Q. R. Baron

    Science Advances　9　(36)　2023/09/08

    Publisher: American Association for the Advancement of Science (AAAS)

    DOI： 10.1126/sciadv.adh8706 　

    eISSN： 2375-2548

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    An accurate pressure scale is a fundamental requirement to understand planetary interiors. Here, we establish a primary pressure scale extending to the multimegabar pressures of Earth’s core, by combined measurement of the acoustic velocities and the density from a rhenium sample in a diamond anvil cell using inelastic x-ray scattering and x-ray diffraction. Our scale agrees well with previous primary scales and shock Hugoniots in each experimental pressure range and reveals that previous scales have overestimated laboratory pressures by at least 20% at 230 gigapascals. It suggests that the light element content in Earth’s inner core (the density deficit relative to iron) is likely to be double what was previously estimated, or Earth’s inner core temperature is much higher than expected, or some combination thereof.

  36. A Molecular‐Scale Origin of Shear Thinning and Brittle Failure of Silicate Melt

    S. Okumura, K. Uesugi, A. Goto, K. Matsumoto, T. Sakamaki

    Geophysical Research Letters　50　(16)　2023/08/12

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2023gl104083 　

    ISSN： 0094-8276

    eISSN： 1944-8007

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    Abstract Shear thinning and brittle failure of silicate melt control the dynamics of volcanic eruptions, but their molecular‐scale origin is still unclear. Here, we conducted tension and compression experiments on silicate melts, using time‐resolved X‐ray diffraction. Our experiments revealed that the intermediate‐range ordering of silicate structures, that is, the ring size formed by the SiO4 tetrahedra, demonstrated elastic and anisotropic dilation under tension and shrinkage under compression in the non‐Newtonian regime. In contrast, there were no significant changes in short‐range ordering, such as Si–O and Si–Si distances. Based on these findings, we inferred that shear thinning observed under high stress originates from the formation of anisotropically deformed large and small rings in silicate structures that are energetically unfavorable and unstable. Brittle failure occurred under high‐stress conditions, in both tension and compression. We propose a stress criterion as a necessary and sufficient condition for magma failure, rather than a strain rate criterion.

  37. Magnetic Spin-Flop Transition of ε-FeOOH at 8 GPa

    Osamu Ikeda, Tatsuya Sakamaki, Takaya Mitsui, Kosuke Fujiwara, Catherine A. McCammon, Akio Suzuki

    Journal of the Physical Society of Japan　92　(4)　2023/04/15

    Publisher: Physical Society of Japan

    DOI： 10.7566/jpsj.92.043702 　

    ISSN： 0031-9015

    eISSN： 1347-4073

  38. Molecular-scale structural changes of silicate melts under tension revealed by time-resolved X-ray diffraction Peer-reviewed

    Satoshi Okumura, Kentaro Uesugi, Akio Goto, Atsuko Namiki, Kazuhisa Matsumoto, Tatsuya Sakamaki

    Chemical Geology　621　121372-121372　2023/03

    Publisher: Elsevier {BV}

    DOI： 10.1016/j.chemgeo.2023.121372 　

    ISSN： 0009-2541

  39. Rheology of nanocrystal-bearing andesite magma and its roles in explosive volcanism

    Satoshi Okumura, Kentaro Uesugi, Akio Goto, Tatsuya Sakamaki, Kazuhisa Matsumoto, Akihisa Takeuchi, Akira Miyake

    COMMUNICATIONS EARTH & ENVIRONMENT　3　(1)　2022/10

    DOI： 10.1038/s43247-022-00573-9 　

    eISSN： 2662-4435

  40. Sound Velocity Measurements of B2‐Fe‐Ni‐Si Alloy Under High Pressure by Inelastic X‐Ray Scattering: Implications for the Composition of Earth's Core

    S. Dominijanni, C. A. McCammon, E. Ohtani, D. Ikuta, T. Sakamaki, T. Ishii, G. Criniti, L. S. Dubrovinsky, S. Khandarkhaeva, T. Fedotenko, K. Glazyrin, H. Uchiyama, H. Fukui, A. Q. R. Baron

    Geophysical Research Letters　49　(15)　2022/08/04

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2021gl096405 　

    ISSN： 0094-8276

    eISSN： 1944-8007

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    Abstract Elastic properties of B2‐Fe0.67Ni0.06Si0.27 (15 wt.% Si) alloy have been investigated by combined high‐resolution inelastic X‐ray scattering and powder X‐ray diffraction in diamond anvil cells up to 100 GPa at room temperature. Densities (ρ), compressional (VP) and shear (VS) wave velocities were extrapolated to inner core conditions to enable comparison with the preliminary reference Earth model. The modeled aggregate compressional and shear wave velocities and densities of the two‐phase mixture of B2‐Fe0.67Ni0.06Si0.27 and hcp‐Fe‐Ni are consistent with inner core PREM values of VP,VS, and ρ based on a linear mixing model with 30(5) vol % B2‐Fe0.67Ni0.06Si0.27 and 70(5) vol % hcp Fe‐Ni, which corresponds to ∼3–5 wt.% Si and ∼5–12 wt.% Ni.

  41. P-V-T equation of state of α-ScOOH.

    Yoshiaki Ito, Osamu Ikeda, Tatsuya Sakamaki, Takahiro Kuribayashi, Akio Suzuki

    High Pressure Research　1-13　2022/06/14

    Publisher: Informa UK Limited

    DOI： 10.1080/08957959.2022.2089568 　

    ISSN： 0895-7959

    eISSN： 1477-2299

  42. Phase transitions of ScOOH under high pressure

    Yoshiaki Ito, Osamu Ikeda, Rintaro Ban, Taito Kubota, Tatsuya Sakamaki, Takahiro Kuribayashi, Akio Suzuki

    High Pressure Research　41　(3)　275-289　2021/07/03

    Publisher: Informa UK Limited

    DOI： 10.1080/08957959.2021.1964495 　

    ISSN： 0895-7959

    eISSN： 1477-2299

  43. Synchrotron Mössbauer spectroscopic and x-ray diffraction study of ferropericlase in the high-pressure range of the lower mantle region

    Maki Hamada, Seiji Kamada, Eiji Ohtani, Tatsuya Sakamaki, Takaya Mitsui, Ryo Masuda, Naohisa Hirao, Yasuo Ohishi, Masahide Akasaka

    Physical Review B　103　(17)　2021/05/12

    Publisher: American Physical Society ({APS})

    DOI： 10.1103/PhysRevB.103.174108 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  44. An experimental system for time-resolved x-ray diffraction of deforming silicate melt at high temperature

    Satoshi Okumura, Kentaro Uesugi, Tatsuya Sakamaki, Akio Goto, Masayuki Uesugi, Akihisa Takeuchi

    Review of Scientific Instruments　91　(9)　2020/09/01

    DOI： 10.1063/5.0009769 　

    ISSN： 0034-6748

    eISSN： 1089-7623

  45. Thermal Equation of State of Fe3C to 327 GPa and Carbon in the Core Peer-reviewed

    Suguru Takahashi, Eiji Ohtani, Daijo Ikuta, Seiji Kamada, Tatsuya Sakamaki, Naohisa Hirao, Yasuo Ohishi

    Minerals　9　(12)　744-753　2019/11

    DOI： 10.3390/min9120744 　

    eISSN： 2075-163X

  46. Phase and melting relations of Fe3C to 300 GPa and carbon in the core. Invited Peer-reviewed

    Suguru Takahashi, Eiji Ohtani, Takeshi Sakai, Seiji Kamada, Shin Ozawa, Tatsuya Sakamaki, Masaaki Miyahara, Yoshinori Ito, Naohisa Hirao, Yasuo Ohishi

    Carbon in Earth’s interior, AGU Monograph volume　25-36　2019/11

  47. Pressure and Composition Effects on Sound Velocity and Density of Core‐Forming Liquids: Implication to Core Compositions of Terrestrial Planets Peer-reviewed

    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　(8)　2272-2293　2019/08

    DOI： 10.1029/2019JE005936 　

    ISSN： 2169-9097

    eISSN： 2169-9100

  48. Sound velocity of Fe3C at high pressure and high temperature determined by inelastic X-ray scattering Peer-reviewed

    S. Takahashi, E. Ohtani, T. Sakamaki, S. Kamada, H. Fukui, S. Tsutsui, H. Uchiyama, D. Ishikawa, N. Hirao, Y. Ohishi, A.Q.R. Baron

    Comptes Rendus Geoscience　351　(2-3)　190-196　2019/02

    DOI： 10.1016/j.crte.2018.09.005 　

    ISSN： 1631-0713

    eISSN： 1778-7025

  49. 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 Peer-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　2018/08/16

    DOI： 10.18957/rr.6.2.208 　

    ISSN： 2187-6886

  50. 放射光X線で探る地球深部：地球の核組成の制約に向けて Invited

    坂巻 竜也

    SPring-8/SACLA利用者情報　23　14-17　2018

  51. 地球で一番深い場所－高圧実験から探る地球の中心核の化学組成－ Invited

    SAKAMAKI Tatsuya

    東北大学アニュアルレビュー2018　12-13　2018

  52. Melting relations in the Fe-S-Si system at high pressure and temperature: implications for the planetary core Peer-reviewed

    Takanori Sakairi, Eiji Ohtani, Seiji Kamada, Takeshi Sakai, Tatsuya Sakamaki, Naohisa Hirao

    PROGRESS IN EARTH AND PLANETARY SCIENCE　4　10　2017/03

    DOI： 10.1186/s40645-017-0125-x 　

    ISSN： 2197-4284

  53. Diamond formation in the deep lower mantle: a high- pressure reaction of MgCO3 and SiO2 Peer-reviewed

    Fumiya Maeda, Eiji Ohtani, Seiji Kamada, Tatsuya Sakamaki, Naohisa Hirao, Yasuo Ohishi

    SCIENTIFIC REPORTS　7　2017/01

    DOI： 10.1038/srep40602 　

    ISSN： 2045-2322

  54. Properties of magma at high pressures: Understanding the magma behavior in the interior of the Earth Invited Peer-reviewed

    Tatsuya Sakamaki

    Japanese Magazine of Mineralogical and Petrological Sciences　46　(1)　30-34　2017

    Publisher: Japanese Association of Mineralogists Petrologists and Economic Geologists

    DOI： 10.2465/gkk.160803 　

    ISSN： 1349-7979 1345-630X

  55. Compressional sound velocity of hexagonal close-packed iron up to 163 GPa and 3000 K Invited

    Sakamaki, T, Ohtani, E, Fukui, H, Baron, A.Q.R

    Reseaech Frontiers 2016　92-93　2017

  56. 地球で一番深い場所－高圧実験から探る地球の中心核の化学組成－ Peer-reviewed

    坂巻 竜也

    まなびの杜　81　3-4　2017

  57. Compressional and shear wave velocities for polycrystalline bcc-Fe up to 6.3 GPa and 800 K Peer-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　2016/05

    DOI： 10.2138/am-2016-5545 　

    ISSN： 0003-004X

    eISSN： 1945-3027

  58. Magnetic and spin transitions in wustite: A synchrotron Mossbauer spectroscopic study Peer-reviewed

    Maki Hamada, Seiji Kamada, Eiji Ohtani, Takaya Mitsui, Ryo Masuda, Tatsuya Sakamaki, Nanami Suzuki, Fumiya Maeda, Masahide Akasaka

    PHYSICAL REVIEW B　93　(15)　155165　2016/04

    DOI： 10.1103/PhysRevB.93.155165 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  59. Phase relations on the K2CO3-CaCO3-MgCO3 join at 6 GPa and 900-1400 C: Implications for incipient melting in carbonated mantle domains, American Mineralogist Peer-reviewed

    Hamada, M, Kamada, S, Ohtani, E, Mitsui, T, Masuda, R, Sakamaki, T, Suzuki, N, Maeda, F, Akasaka, M

    Physical Review B - Condensed Matter and Materials Physics　93　(15)　155165　2016

    DOI： 10.1103/PhysRevB.93.155165 　

  60. Sound velocity measurement by inelastic X-ray scattering at high pressure and temperature by resistive heating diamond anvil cell Peer-reviewed

    E. Ohtani, K. Mibe, T. Sakamaki, S. Kamada, S. Takahashi, H. Fukui, S. Tsutsui, A. Q. R. Baron

    RUSSIAN GEOLOGY AND GEOPHYSICS　56　(1-2)　190-195　2015/01

    DOI： 10.1016/j.rgg.2015.01.012 　

    ISSN： 1068-7971

    eISSN： 1878-030X

  61. Magma in the earth's interior Invited Peer-reviewed

    Tatsuya Sakamaki

    Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu　25　(2)　165-171　2015

    Publisher: Japan Society of High Pressure Science and Technology

    DOI： 10.4131/jshpreview.25.165 　

    ISSN： 1348-1940 0917-639X

  62. The abundance of potassium in the Earth's core Peer-reviewed

    Kosui Watanabe, Eiji Ohtani, Seiji Kamada, Tatsuya Sakamaki, Masaaki Miyahara, Yoshinori Ito

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS　237　65-72　2014/12

    DOI： 10.1016/j.pepi.2014.10.001 　

    ISSN： 0031-9201

    eISSN： 1872-7395

  63. Stability of hydrous phase H MgSiO4H2 under lower mantle conditions Peer-reviewed

    Eiji Ohtani, Yohei Amaike, Seiji Kamada, Tatsuya Sakamaki, Naohisa Hirao

    GEOPHYSICAL RESEARCH LETTERS　41　(23)　8283-8287　2014/12

    DOI： 10.1002/2014GL061690 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  64. Sound velocity of Fe-S liquids at high pressure: Implications for the Moon's molten outer core Peer-reviewed

    Zhicheng Jing, Yanbin Wang, Yoshio Kono, Tony Yu, Tatsuya Sakamaki, Changyong Park, Mark L. Rivers, Stephen R. Sutton, Guoyin Shen

    EARTH AND PLANETARY SCIENCE LETTERS　396　78-87　2014/06

    DOI： 10.1016/j.epsl.2014.04.015 　

    ISSN： 0012-821X

    eISSN： 1385-013X

  65. A magma “traffic jam” between lithosphere and asthenosphere Invited

    T. Sakamaki

    SPring-8 Research Frontiers 2013　86-87　2014

  66. A compact system for generating extreme pressures and temperatures: An application of laser-heated diamond anvil cell to inelastic X-ray scattering Peer-reviewed

    Hiroshi Fukui, Takeshi Sakai, Tatsuya Sakamaki, Seiji Kamada, Suguru Takahashi, Eiji Ohtani, Alfred Q. R. Baron

    REVIEW OF SCIENTIFIC INSTRUMENTS　84　(11)　113902　2013/11

    DOI： 10.1063/1.4826497 　

    ISSN： 0034-6748

    eISSN： 1089-7623

  67. Sound velocity of hexagonal close-packed iron up to core pressures Peer-reviewed

    Eiji Ohtani, Yuki Shibazaki, Takeshi Sakai, Kenji Mibe, Hiroshi Fukui, Seiji Kamada, Tatsuya Sakamaki, Yusuke Seto, Satoshi Tsutsui, Alfred Q. R. Baron

    Geophysical Research Letters　40　(19)　5089-5094　2013/10/16

    DOI： 10.1002/grl.50992 　

    ISSN： 0094-8276 1944-8007

    eISSN： 1944-8007

  68. Interfacial tension of Fe-Si liquid at high pressure: Implications for liquid Fe-alloy droplet size in magma oceans Peer-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　2012/08

    DOI： 10.1016/j.pepi.2012.05.002 　

    ISSN： 0031-9201

  69. 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 Peer-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　2012/03

    DOI： 10.1016/j.pepi.2012.01.002 　

    ISSN： 0031-9201

    eISSN： 1872-7395

  70. Simultaneous structure and elastic wave velocity measurement of SiO2 glass at high pressures and high temperatures in a Paris-Edinburgh cell Peer-reviewed

    Yoshio Kono, Changyong Park, Tatsuya Sakamaki, Curtis Kenny-Benson, Guoyin Shen, Yanbin Wang

    REVIEW OF SCIENTIFIC INSTRUMENTS　83　(3)　033905　2012/03

    DOI： 10.1063/1.3698000 　

    ISSN： 0034-6748

  71. Density and sound velocity of iron-sulfur alloy in liquids at high pressures and implications to planetary cores

    Z. Jing, Y. Wang, T. Yu, T. Sakamaki, Y. Kono, C. Park

    Lunar and Planetary Institute　2012

  72. Density measurement of liquid FeS at high pressures using synchrotron X-ray absorption Peer-reviewed

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

    AMERICAN MINERALOGIST　96　(5-6)　864-868　2011/05

    DOI： 10.2138/am.2011.3616 　

    ISSN： 0003-004X

  73. Effect of hydrogen on the melting temperature of FeS at high pressure: Implications for the core of Ganymede Peer-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　2011/01

    DOI： 10.1016/j.epsl.2010.10.033 　

    ISSN： 0012-821X

  74. Hydrogenation of FeSi under high pressure Peer-reviewed

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

    AMERICAN MINERALOGIST　96　(1)　93-99　2011/01

    DOI： 10.2138/am.2011.3628 　

    ISSN： 0003-004X

    eISSN： 1945-3027

  75. Pressure and temperature dependence of the viscosity of a NaAlSi2O6 melt Peer-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　2011/01

    DOI： 10.1007/s00269-010-0381-4 　

    ISSN： 0342-1791

  76. 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 Peer-reviewed

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

    Journal of Geophysical Research: Solid Earth　115　(6)　2010/06

    DOI： 10.1029/2009JB006905 　

    ISSN： 2169-9313

    eISSN： 2169-9356

  77. Density measurement of Fe3C liquid using X-ray absorption image up to 10 GPa and effect of light elements on compressibility of liquid iron Peer-reviewed

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

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH　115　B06207　2010/06

    DOI： 10.1029/2009JB006905 　

    ISSN： 0148-0227

  78. Hydrogen incorporation to the Earth's core

    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　2009/06

    ISSN： 0016-7037

  79. In situ measurement of interfacial tension of Fe-S and Fe-P liquids under high pressure using X-ray radiography and tomography techniques Peer-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　2009/05

    DOI： 10.1016/j.pepi.2009.01.004 　

    ISSN： 0031-9201

  80. Stability of carbonated magmas at the base of the Earth's upper mantle Peer-reviewed

    Sujoy Ghosh, Eiji Ohtani, Konstantin Litasov, Akio Suzuki, Tatsuya Sakamaki

    GEOPHYSICAL RESEARCH LETTERS　34　(22)　L22312　2007/11

    DOI： 10.1029/2007GL031349 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  81. In situ observation and determination of liquid immiscibility in the Fe-O-S melt at 3 GPa using a synchrotron X-ray radiographic technique Peer-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　2007/09

    DOI： 10.1029/2007GL030750 　

    ISSN： 0094-8276

  82. 高温高圧下でのイメージング実験 Peer-reviewed

    鈴木昭夫, 西田圭佑, 坂巻竜也, 寺崎英紀, 大谷栄治

    KEK proceedings 放射光高圧研究における実験技術の新展開　61-64　2007

  83. ダイヤモンドアンビルを用いた珪酸塩メルトのX線吸収密度測定 Peer-reviewed

    浦川 啓, 坂巻竜也

    KEK proceedings 放射光高圧研究における実験技術の新展開　1-4　2007

  84. Effect of pressure on the viscosity of Fe-S and Fe-C liquids up to 16 GPa Peer-reviewed

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

    GEOPHYSICAL RESEARCH LETTERS　33　(22)　L22307　2006/11

    DOI： 10.1029/2006GL027147 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  85. Anomalous compression of basaltic magma: Implications to pressure-induced structural change in silicate melt Invited

    S. Urakawa, T. Sakamaki, E. Ohtani

    SPring-8 Research Frontiers 2005　113-114　2006

Show all ︎Show first 5

Misc. 61

  1. High pressure neutron CT for visualizing water

    有馬寛, 服部高典, 佐野亜沙美, 町田真一, 阿部淳, 舟越賢一, 坂巻竜也

    量子ビームサイエンスフェスタ(Web)　2023　2024

  2. Structure measurements of CO2-bearing sodium silicate melt at high pressure based on synchrotron X-ray diffraction experiments

    早舩紫野, 坂巻竜也, 鈴木昭夫

    量子ビームサイエンスフェスタ(Web)　2023　2024

  3. Effect of CO2 on the structure of silicate melts under pressure

    早舩紫野, 坂巻竜也, 舟越賢一, 鈴木昭夫

    KEK Progress Report (Web)　(2024-2)　2024

    ISSN： 1344-6320

  4. Structural analysis of CO2-bearing sodium silicate melts using molecular dynamics simulations and synchrotron radiation X-ray diffraction experiments

    早舩紫野, 小野寺陽平, 小原真司, 市川晴貴, 坂巻竜也, 舟越賢一, 鈴木昭夫

    日本鉱物科学会年会講演要旨(Web)　2024　2024

  5. Sound velocity of B2-FeNiSi alloy at high pressure and high temperature and constitution of the Earth’s inner core

    大谷栄治, 生田大穣, 福井宏之, 福井宏之, 坂巻竜也, 石川大介, 石川大介, BARON Alfred Q. R., BARON Alfred Q. R.

    日本鉱物科学会年会講演要旨(Web)　2024　2024

  6. Effect of CO2 on the structure of sodium silicate melt at high pressure

    早舩紫野, 大橋智典, 坂巻竜也, 鈴木昭夫

    日本地球惑星科学連合大会予稿集(Web)　2023　2023

  7. Mantle Melting Phenomena under Hydrous Conditions and Structural Analysis of Hydrous Sodium Silicate Melts

    坂巻竜也

    高圧力の科学と技術　33　(3)　2023

    ISSN： 0917-639X

  8. Partial molar volume of Fe2O3 in magma at high pressure

    坂凜太郎, 鈴木昭夫, 坂巻竜也

    日本鉱物科学会年会講演要旨(Web)　2021　2021

  9. アルミノケイ酸塩ガラスの圧力誘起構造変化のその場観察

    森田大智, 山田明寛, 吉田智, 松岡純, 坂巻竜也, 鈴木昭夫, 若林大佑

    日本セラミックス協会年会講演予稿集(CD-ROM)　2018　ROMBUNNO.2G04　2018/03/01

  10. H2OとFeに富んだ下部マントル環境下におけるMgCO3の安定性

    前田郁也, 鎌田誠司, 宮島延吉, 平尾直久, 河口沙織, PETITGIRARD Sylvain, MCCAMMON Catherine, FROST Daniel, 坂巻竜也, 鈴木昭夫

    高圧討論会講演要旨集　59th　2018

    ISSN： 0917-6373

  11. Reaction of MgCO3 and Fe observed by transmission electron microscopy

    Maeda, F, Miyajima, N, Kamada, S, Sakamaki, T, Suzuki, A

    Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik Universität Bayreuth Annual Report 2017　92-93　2018

  12. パイロープガラスの圧力起因の構造変化

    久野直毅, 坂巻竜也, 堀岡祥生, 大橋智典, 鈴木昭夫

    高圧討論会講演要旨集　58th　104　2017/10/25

    ISSN： 0917-6373

  13. 川井型プレスを用いたX線イメージング吸収法による固体鉄の密度測定

    寺崎英紀, 下山裕太, 西田圭佑, 坂巻竜也, 柴崎裕樹, 肥後祐司, 丹下慶範

    高圧討論会講演要旨集　58th　222　2017/10/25

    ISSN： 0917-6373

  14. 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

  15. 高圧下におけるFeOの音速測定

    田中遼介, 坂巻竜也, 福井宏之, 大谷栄治, 鎌田誠司, 筒井智嗣, 内山裕士, BARON Alfred Q.R, 鈴木昭夫

    高圧討論会講演要旨集　57th　102　2016/10/12

    ISSN： 0917-6373

  16. 下部マントル条件下における玄武岩質ガラスの放射光メスバウアー分光測定

    前田郁也, 大谷栄治, 鎌田誠司, 坂巻竜也, 鈴木那奈美, 平尾直久, 大石泰生, 三井隆也, 増田亮, 中野智志

    高圧討論会講演要旨集　56th　2015

    ISSN： 0917-6373

  17. 高温高圧下における含水H相‐δ相固溶体(MgSi,Al2)O2(OH)2の安定領域と下部マントルの水

    大谷栄治, 天池洋平, 鎌田誠司, 坂巻竜也, 増野いづみ, 村上元彦, 鈴木昭夫, 平尾直久

    高圧討論会講演要旨集　55th　9　2014/11/10

    ISSN： 0917-6373

  18. P2-11 The melting relation of lunar high-Ti basalt at high pressure

    Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2014　"P2-11"　2014/09/10

    Publisher: The Japanese Society for Planetary Sciences

  19. spin transition of ferropericlase under the lower mantle condition using synchrotron X-ray diffraction and Mossbauer spectroscopy simultaneous measurement system

    HAMADA Maki, OHTANI Eiji, KAMADA Seiji, SAKAMAKI Tatsuya, HIRAO Naohisa, OHISHI Yasuo

    2013　124-124　2013/09/05

    ISSN： 1348-6543

  20. レーザー加熱による高温高圧X線非弾性散乱によるhcp‐Feの縦波速度測定

    大谷栄治, 坂巻竜也, 福井裕史, 鎌田誠司, 高橋豪, 坂入崇紀, 高畑明拓, 境毅, 筒井聡, BARON A. B

    日本鉱物科学会年会講演要旨集　2013　121-121　2013/09/05

    ISSN： 1348-6543

  21. 下部マントル条件下におけるウスタイトおよびフェロペリクレースのスピン転移

    浜田麻希, 浜田麻希, 大谷栄治, 鎌田誠司, 坂巻竜也, 平尾直久, 大石泰生, 三井隆也, 増田亮

    高圧討論会講演要旨集　54th　2013

    ISSN： 0917-6373

  22. コンパクトLH‐DACを用いた高温高圧X線非弾性散乱

    福井宏之, 境毅, 坂巻竜也, 高橋豪, 大谷栄治, BARON Alfred Q.R

    高圧討論会講演要旨集　53rd　175　2012/10/25

    ISSN： 0917-6373

  23. 高温高圧下におけるhcp‐Feの音速測定と地球核の構造

    大谷栄治, 境毅, 柴崎裕樹, 福井裕之, 福井裕之, 三部賢治, 坂巻竜也, 高橋豪, 坂入崇則, 筒井智嗣, BARON Alfred QR

    高圧討論会講演要旨集　53rd　41　2012/10/25

    ISSN： 0917-6373

  24. 高温高圧下における鉄の音速測定と内核の構成

    大谷栄治, 境毅, 柴崎祐樹, 福井裕史, 三部賢治, 坂巻竜也, 高橋豪, 坂入崇紀, 筒井聡, BARON A.B

    日本鉱物科学会年会講演要旨集　2012　132-132　2012/09/15

    ISSN： 1348-6543

  25. Elastic wave velocity measurement combined with synchrotron X-ray techniques in Paris-Edinburgh press

    KONO Yoshio, PARK Changyong, SHEN Guoyin, SAKAMAKI Tatsuya, YU Tony, WANG Yanbin

    2011　118-118　2011/09/05

    ISSN： 1348-6543

  26. In-situ X-ray studies of the melting temperature of FeS-H system : Implications for the core of Ganymede

    SHIBAZAKI Yuki, OHTANI Eiji, TERASAKI Hidenori, TATEYAMA Ryuji, SAKAMAKI Tatsuya, TSUCHIYA Taku, FUNAKOSHI Ken-ichi, HIGO Yuji

    51　106-106　2010/10/11

    ISSN： 0917-6373

  27. Hydrogen solubility into FeSi under high pressure

    TERASAKI Hidenori, SHIBAZAKI Yuki, SAKAMAKI Tatsuya, TATEYAMA Ryuji, OHTANI Eiji, FUNAKOSHI Ken-ichi, HIGO Yuji

    51　45-45　2010/10/11

    ISSN： 0917-6373

  28. Phase relation of Fe-Ni-H system at high pressure and high temperature: application to the thermal structure of the Earth's core

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

    SPring-8 User Experiment Report No.24 (2009B)　24　2009B1696　2010/06

  29. 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　2010/01

  30. 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　2010/01

  31. 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　2010/01

  32. 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　2009/06

  33. 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　2009/06

  34. 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　2009/02

  35. X線イメージング法による融体の研究とその地球・惑星内部への適用

    鈴木昭夫, 大谷栄治, 寺崎英紀, 坂巻竜也, 白石令, 西田圭佑, 柴崎裕樹, 林宏美, 立山隆二, 大高理, 久保友明, 土井菜保子, 下宿彰

    PFシンポジウム要旨集　26th　32　2009

  36. 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

  37. 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

  38. X線その場観察浮沈法によるFe‐S融体の密度測定

    鈴木昭夫, 大谷栄治, 西田圭佑, 寺崎英紀, 坂巻竜也, 柴崎裕樹, 林宏美, 亀卦川卓美

    高圧討論会講演要旨集　49th　263　2008/11/01

    ISSN： 0917-6373

  39. 放射光X線を用いた高温高圧下での鉄‐リングウッダイト間の水素分配:火星核マントル境界での水素の挙動解明

    柴崎裕樹, 大谷栄治, 寺崎英紀, 鈴木昭夫, 坂巻竜也, 林宏美, 西田圭佑, 舟越賢一

    高圧討論会講演要旨集　49th　233　2008/11/01

    ISSN： 0917-6373

  40. 高温高圧下におけるX線吸収画像を用いたFeS融体の密度測定

    西田圭佑, 大谷栄治, 鈴木昭夫, 寺崎英紀, 柴崎祐樹, 坂巻竜也, 林宏美, 亀卦川卓美

    高圧討論会講演要旨集　49th　264　2008/11/01

    ISSN： 0917-6373

  41. Density measurement of hydrous MORB by X-ray absorption method at high pressure and high temperature

    Urakawa, S, Sakamaki, T, Nishida, K, Suzuki, A, Yamaguchi, J, Ohtani, E

    SPring-8 User Experimental Report No.20 (2007B)　20　2007B3707　2008/06

  42. X線イメージング法による融体の研究とその地球・惑星内部への適用

    大谷栄治, 鈴木昭夫, 寺崎英紀, 津野究成, 坂巻竜也, 西田圭佑, 柴崎裕樹, 大高理, 山田明寛

    PFシンポジウム要旨集　25th　78　2008

  43. Pressure and temperature dependence of the viscosity of NaAlSi2O6 melt

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

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences　2008　(0)　181-181　2008

    Publisher: Japan Association of Mineralogical Sciences

    DOI： 10.14824/jakoka.2008.0.181.0 　

    ISSN： 1348-6543

    More details Close

    The viscosity of silicate melt of NaAlSi2O6 composition was measured at pressures from 1.6 to 5.5 GPa and at temperatures from 1350 to 1880&deg;C. We employed in situ falling sphere viscometry by using X-ray radiography. We found that the viscosity of NaAlSi2O6 melt decreased with increasing pressure up to 3.6 GPa at 1780&plusmn;10&deg;C. By using the relationship between the logarithm of viscosity and the reciprocal temperature, the activation energies for viscous flow were calculated to be 3.7&plusmn;0.5 * 10^2 and 3.6&plusmn;0.5 * 10^2 kJ/mol at 2.2 and 2.9 GPa, respectively.

  44. Density measurement of peridotite magma at high pressure and temperature

    Sakamaki Tatsuya, Ohtani Eiji, Urakawa Satoru, Suzuki Akio, Katayama Yoshinori, Terasaki Hidenori, Nishida Keisuke, Hayashi Hiromi, Nakano Yosuke

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences　2008　(0)　180-180　2008

    Publisher: Japan Association of Mineralogical Sciences

    DOI： 10.14824/jakoka.2008.0.180.0 　

    ISSN： 1348-6543

    More details Close

    Density of magma at high pressure is one of the most important properties to understand magma migration in the planetary interior and the differentiation of the terrestrial planets. The density measurements of magma have been carried out by several methods (shock compression experiments and sink-float method in static experiments, etc.). However, since these methods have difficulties in acquisition of data at a desired pressure and temperature, the density of the silicate melt have been measured under only a few conditions. Recently a new density measurement was developed by the X-ray absorption method. Advantage of this method is to measure density of liquids at a desired pressure and temperature. In the present study we measured the density of peridotite magma by X-ray absorption method. Experiments were carried out at the BL22XU beamline at SPring-8. A DIA-type cubic anvil apparatus was used for generation of high pressure and temperature. We used tungsten carbide anvils with the top anvil sizes of 6 mm. The energy of monochromateized X-ray beam was 23 keV. The intensities of incident and transmitted X-ray were measured by ion chambers. The density of the melt was calculated on the basis of Beer-Lambert law. The starting material was a crystal with the pyrolite composition. Experiments were made from 1 atm to 5 GPa, from 300 to 2100 K.

  45. 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

  46. X線吸収法を用いた高圧下におけるFeS融体の密度測定

    西田圭佑, 大谷栄治, 浦川啓, 片山芳則, 鈴木昭夫, 寺崎英紀, 坂巻竜也

    高圧討論会講演要旨集　48th　274　2007/11/11

    ISSN： 0917-6373

  47. 高圧下における液体Fe‐SおよびFe‐P合金の界面張力測定

    寺崎英紀, 浦川啓, 舟越賢一, 大谷栄治, 鈴木昭夫, 坂巻竜也, 西田圭佑

    高圧討論会講演要旨集　48th　271　2007/11/11

    ISSN： 0917-6373

  48. 高圧下における玄武岩マグマの粘度

    鈴木昭夫, 大谷栄治, 安藤良太, 坂巻竜也, 寺崎英紀, 舟越賢一

    高圧討論会講演要旨集　48th　272　2007/11/11

    ISSN： 0917-6373

  49. 高温高圧下におけるMORBマグマの密度と構造

    坂巻竜也, 大谷栄治, 浦川啓, 片山芳則, 舟越賢一, 鈴木昭夫, 寺崎英紀, 西田圭佑

    高圧討論会講演要旨集　48th　105　2007/11/11

    ISSN： 0917-6373

  50. 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　2007/04

  51. Anomalous compression behavior of MORB composition magma

    Urakawa, S, Sakamaki, T, Suzuki, A, Ohtani, E, Nishida, K

    Spring-8 User Experimental Report　2006B3710　2007

  52. X線吸収法を用いた高温高圧条件下におけるMORBメルトとFeSメルトの密度測定

    Sakamaki, T, Ohtani, E, Nishida, K, Suzuki, A, Yamaguchi, J, Urakawa, S

    Spring-8 User Experimental Report　2007A3709　2007

  53. 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

  54. 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

  55. 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

  56. Density measurement for MORB melts by X-ray absorption method

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

    Spring-8 User Experimental Report　2006A　2006

  57. X線吸収法によるMORBメルトの密度測定

    坂巻竜也, 浦川啓, 大谷栄治, 鈴木昭夫, 片山芳則

    高圧討論会講演要旨集　46th　112　2005/10/20

    ISSN： 0917-6373

  58. 高圧X線吸収法によるNa2Si2O5‐FeO系メルトの密度測定

    浦川啓, 坂巻竜也, 安藤良太, 鈴木昭夫, 大谷栄治, 片山芳則

    高圧討論会講演要旨集　46th　28　2005/10/20

    ISSN： 0917-6373

  59. hydrous MORBの高圧下における粘性測定

    加藤幸子, 大谷栄治, 鈴木昭夫, 安藤良太, 川添貴章, 坂巻竜也, 寺崎英紀, 舟越賢一

    高圧討論会講演要旨集　45th　285　2004/09/30

    ISSN： 0917-6373

  60. In situ density measurements of basaltic melt at high pressure by X-ray absorption method

    Ando Ryota, Ohtani Eiji, Suzuki Akio, Sakamaki Tatsuya, Urakawa Satoru, Watanabe Naoki, Takahashi Nobuyuki, Katayama Yoshinori

    Abstracts of Papers Presented at the Annual Meeting of The Japanese Association of Mineralogists, Petrologists and Economic Geologists　2004　(0)　71-71　2004

    Publisher: Japan Association of Mineralogical Sciences

    DOI： 10.14824/jampeg.2004.0.71.0 　

    ISSN： 1348-6543

    More details Close

    Density of silicate melt at high pressure is one of the most important properties to understand magma migration in the planetary interior. However, because of experimental difficulties, the density of magma at high pressure is poorly known. Katayama et al. (1996) recently developed a new in site density measurement method for metallic melts, based on the density dependency of X-ray absorption in the sample. In this study, we tried to measure the density of basaltic melt by this absorption method.When X-ray is transmitted to the sample, the intensity of the transmitted X-ray beam (I) is expressed as follows; I= I0 exp(-mrt), where I0 is the intensity of incident X-ray beam, m is the mass absorption coefficient, r is the density of the sample, and t is the thickness of the sample. If t and m are known, we can determine the density of the sample by measuring I0 and I. This is the principle of the absorption method for density measurement. In this study, in order to determine t, we used a single crystalline diamond cylinder as a sample capsule, which shows less absorbed and less deformed. So t (thickness of the sample at the point x) is expressed as follows; t = 2*(R2-x2)1/2, R is the inner radius of cylinder, and x is distance from center of the capsule.Experiments were made at the beamline (BL22XU) of Spring-8. For generation of high pressure and high temperature, we used DIA-type cubic anvil apparatus (SMAP180) there. We used tungsten carbide anvils with the edge-length of 6 mm. The energy of monochromatic X-ray beam was 25 keV and the beam size was reduced to 0.1*0.1 mm2 by 2 slits. Starting material was a glass with the MORB composition (SiO2-Al2O3-FeO-MgO-CaO-Na2O). We measured the density from 1 to 5 GPa at from 300 K to 1873K. Details of conclusion and discussion will be reported the day.

  61. Density measurement of Fe doped Na-silicate glass and melt at high-pressures and temperatures by in-situ x-ray absorption method

    Urakawa Satoru, Watanabe Naoki, Takahashi Nobuyuki, Ando Ryota, Sakamaki Tatuya, Suzuki Akio, Ohtani Eiji, Katayama Yoshinori

    Abstracts for Annual Meeting of the Mineralogical Society of Japan　2004　(0)　6-6　2004

    Publisher: Japan Association of Mineralogical Sciences

    DOI： 10.14824/kobutsu.2004.0.6.0 　

    ISSN： 1348-6543

Show all ︎Show first 5

Books and Other Publications 1

  1. Magma Under Pressure

    SAKAMAKI Tatsuya

    ELSEVIER　2018

    ISBN: 9780128113011

Presentations 44

  1. In-situ Raman spectroscopy of ε-FeOOH under high pressures

    Ikeda, O, Sakamaki, T, Suzuki, A

    Japan Geoscience Union Meeting 2019

  2. Formation of highly pure anorthite crust on the low-volatile astral bodies by low-viscous magma ocean

    Sakamaki, T, Kono, Y

    Japan Geoscience Union Meeting 2019

  3. Melting experiments of hydrous peridotite under the top of the lower mantle conditions

    Nakajima, A, Sakamaki, T, Kawazoe, T, Suzuki, A

    Interaction and Coevolution of the Core and Mantle Toward Integrated Deep Earth Science Internarional Symposium Annual General Meeting　2018/03/26

  4. Structures of basaltic glass under high pressure by in-situ X-ray and neutron diffraction investigations

    Ohashi, T, Sakamaki, T, Hattori, T, Sano-Furukawa, A, Funakoshi, K, Suzuki, A

    Interaction and Coevolution of the Core and Mantle Toward Integrated Deep Earth Science Internarional Symposium Annual General Meeting　2018/03/26

  5. 川井型プレスを用いたX線イメージング吸収法による固体鉄の密度測定

    寺﨑英紀, 下山裕太, 西田圭佑, 坂巻竜也, 柴﨑裕樹, 肥後祐司

    第58回高圧討論会　2017/11/08

  6. パイロープガラスの圧力起因の構造変化

    久野直毅, 坂巻竜也, 堀岡祥生, 大橋智典, 鈴木昭夫

    第58回高圧討論会　2017/11/08

  7. 高温高圧実験によるアノーサイトメルトの粘度と月玄武岩の弾性波速度の測定

    坂巻竜也

    第13回月地殻研究会　2017/10/16

  8. Structure measurements of basaltic glass at high pressure using X-ray and neutron diffraction techniques

    Ohashi, T, Sakamaki, T, Hattori, T, Sano-Furukawa, A, Funakoshi, K, Suzuki, A

    The 5th Workshop for Extreme Materials Science “Silicate Melt/Glass”　2017/10/06

  9. Sound velocity and elastic properties of liquid Fe-Ni-Si at high pressure

    Terasaki, H, Maki, M, Shimoyama, Y, Nishida, K, Urakawa, S, Takubo, Y, Shibazaki, Y, Sakamaki, T, Higo, Y, Machida, A, Kondo, T

    High-Pressure Mineral Physics Seminar　2017/09/24

  10. Compressibility of MgCO3 phase II under the lowermost mantle conditions

    Maeda, F, Kamada, S, Sakamaki, T, Hirao, N, Ohishi, Y, Suzuki, A

    High-Pressure Mineral Physics Seminar　2017/09/24

  11. Sound velocity of iron-light element compounds and composition of the inner core

    Ohtani, E, Sakamaki, T, Kamada, S, Ikuta, D, Tanaka, R, Fukui, H, Baron, A.Q.R

    High-Pressure Mineral Physics Seminar　2017/09/24

  12. Structure measurement of basaltic glass using neutron diffraction

    T. Sakamaki

    High-Pressure Mineral Physics Seminar　2017/09/24

  13. 圧力起因の玄武岩質ガラスの構造変化

    大橋智典, 坂巻竜也, 服部高典, 佐野亜沙美, 小澤信, 舟越賢一, 鈴木昭夫

    日本鉱物科学会2017年年会　2017/09/12

  14. 音速測定と固液分配実験から測定する内核の組成

    大谷栄治, 坂巻竜也, 生田大穣, 田中遼介, 福井宏之, バロンアルフレッド

    日本鉱物科学会2017年年会　2017/09/12

  15. 高温高圧下での鉄-珪素合金の弾性波速度測定

    坂巻竜也, 寺﨑英紀, 柴﨑裕樹, 戸邉宙, 下山裕太, 肥後祐司, 鈴木昭夫

    日本鉱物科学会2017年年会　2017/09/12

  16. 放射光X線で探る地球深部：地球の核組成の制約に向けて Invited

    坂巻竜也

    SPring-8シンポジウム2017　2017/09/04

  17. Phase relations of MgCO3 high-pressure carbonate under the lower mantle conditions

    Maeda, F, Kamada, S, Sakamaki, T, Miyajima, N, Hirao, N, Ohishi, Y, Suzuki, A

    55th EHPRG Meeting　2017/09/03

  18. Densification of calcium-aluminum-silicate glass at the pressure of ~5.5 GPa

    Nakajima, A, Sakamaki, T, Hisano, N, Horioka, Y, Suzuki, A

    55th EHPRG Meeting　2017/09/03

  19. Geochemical and mineral physics constraints on the composition of the inner core

    Ohtani, E, Sakamaki, T, Sakairi, T, Tanaka, R, Kamada, S, Fukui, H, Barao, A.Q.R

    Goldschmidt 2017　2017/08/13

  20. Basaltic glass structure by time-of-flight neutron diffraction

    Sakamaki, T, Hattori, T, Sano-Furukawa, A

    Goldschmidt 2017　2017/08/13

  21. Interior structure of Mars estimated from elastic properties of liquid Fe-Ni-S

    Terasaki, H, Shimoyama, Y, Maki, M, Kurokawa, F, Urakawa, S, Nishida, K, Saito, R, Takubo, Y, Shibazaki, Y, Sakamaki, T, Machida, A, Higo, Y, Kondo, T

    JpGU-AGU Joint Meeting 2017　2017/05/20

  22. High-pressure phase transitions of MgCO3 under the lower mantle conditions

    Maeda, F, Kamada, S, Sakamaki, T, Hirao, N, Ohishi, Y, Suzuki, A

    JpGU-AGU Joint Meeting 2017　2017/05/20

  23. Phase relation in MgCO3-SiO2 system up to the lowermost mantle

    Maeda, F, Ohtani, E, Kamada, S, Sakamaki, T, Hirao, N, Ohishi, Y

    JpGU-AGU Joint Meeting 2017　2017/05/20

  24. The heterogeneities in Lunar interior: Role of High Titanium materials

    Ohtani, E, Igarashi, M, Sakamaki, T, Zhao, D

    JpGU-AGU Joint Meeting 2017　2017/05/20

  25. Composition of the core: Geochemical and mineral physics constraints

    Ohtani, E, Sakairi, T, Sakamaki, T, Kamada, S, Tanaka, R, Fukui, H, Baron, A.Q.R

    JpGU-AGU Joint Meeting 2017　2017/05/20

  26. Experimental investigation into the cause of a high attenuation zone of the lunar seismic waves: A possible partialy molten layer at the lowest lunar mantle

    Igarashi, M, Shibazaki, Y, Shiraishi, R, Sakamaki, T, Suzuki, A

    JpGU-AGU Joint Meeting 2017　2017/05/20

  27. Phase relations in the Fe-FeSi system at 10 GPa : Implications for Mercury’s core

    Tobe, H, Shibazaki, Y, Sakamaki, T, Hiroi, Y, Abe, R, Suzuki, A

    JpGU-AGU Joint Meeting 2017　2017/05/20

  28. The sound velocity measurements of FeO at high pressure and temperature: Implications for the low velocity anomaly around the core-mantle boundary

    Tanaka, R, Sakamaki, T, Fukui, H, Ohtani, E, Kamada, S, Sato, S, Tsutsui, S, Uchiyama, H, Baron, A.Q.R, Suzuki, A

    JpGU-AGU Joint Meeting 2017　2017/05/20

  29. Sound velocity of hcp-Fe at multi-megabar pressures International-presentation

    Sakamaki, T, Fukui, H, Ohtani, E, Tanaka, R, Baron, A.Q.R

    JpGU-AGU Joint Meeting 2017　2017/04/20

  30. マルチメガバールでの鉄の音速測定

    坂巻竜也

    新学術領域研究「核‐マントル共進化」平成28年度成果発表会　2017/03/26

  31. 地球惑星深部環境におけるマグマの物性と構造に関する研究

    坂巻竜也

    日本鉱物科学会2016年年会　2016/09/23

  32. 高温高圧下での鉄-ニッケル合金の音速・密度測定

    坂巻竜也

    日本鉱物科学会2016年年会　2016/09/23

  33. 高温高圧下での非弾性X 線散乱による鉄-ニッケル合金の音速測定

    坂巻竜也, 大谷栄治, 福井宏之, 鎌田誠司, 坂入崇紀, 筒井智嗣, BARON Alfred

    第56回高圧討論会　2015/11/10

  34. 超高温高圧下における鉄合金の音速測定

    坂巻竜也

    地球惑星科学研究会・高圧物質科学研究会・機能性材料ナノスケール原子相関研究会 合同研究会　2015/09/12

  35. Contrasting viscosity and structure between anorthite and albite melts International-presentation

    T. Sakamaki, Y. Kono

    Goldshmidt2015　2015/08/16

  36. Viscosity and structure of anorthite melt under high pressure and high temperature conditions International-presentation

    T. Sakamaki, Y. Kono

    Japan Geoscience Union Meeting 2015　2015/05/24

  37. Sound velocity and density of hcp-Fe under Earth’s core conditions International-presentation

    T. Sakamaki, E. Ohtani, H. Fukui, S. Kamada, S. Takahashi, T. Sakairi, A. Takahata, T. Sakai, S. Tsutsui, A. Q. R. Baron

    AGU FALL MEETING 2014　2014/12/15

  38. Ponded melt at the boundary between the lithosphere and asthenosphere International-presentation

    T. Sakamaki, A. Suzuki, E. Ohtani, H. Terasaki, S. Urakawa, Y. Katayama, K. Funakoshi, Y. Wang, J. J. Hernlund, M. D. Ballmer

    Advances in High Pressure Research: Breaking Scales and Horizons　2014/09/22

  39. 高圧下におけるアノーサイトメルトの粘性・構造測定

    坂巻竜也, 河野義生

    日本鉱物科学会2014年年会　2014/09/17

  40. 高チタン玄武岩の物性から見た月マントルの不均質性

    坂巻竜也

    月・火星・水星内部研究会　2014/09/08

  41. Compressional sound velocity and density mearurements of hcp-Fe under core conditions International-presentation

    E. Ohtani, H. Fukui, S. Kamada, S. Takahashi, T. Sakairi, A. Takahata, T. Sakai, S. Tsutsui, A. Q. R. Baron

    Japan Geoscience Union Meeting 2014　2014/04/28

  42. 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　2009/07

  43. 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　2009/07

  44. 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　2009/07

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Research Projects 24

  1. Elucidation of the chemical reactions and molten layer at the Martian core-mantle boundary

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2025/04/01 - 2029/03/31

  2. 液体鉄合金の高圧物性測定によるコア化学組成とマントル最下部の超低速度領域の解明

    中島 陽一, 坂巻 竜也, PUSZTAI LASZLO, 島村 孝平

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 熊本大学

    2025/04/01 - 2029/03/31

  3. Measurement of sound velocity and equation of state of iron alloys at ultrahigh pressure and high temperature and application to the inner core heterogeneity Competitive

    E. Ohtani, D. Ikuta, T. Sakamaki, T. Ishii, H. Fukui, A. Q. R. Baron

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2024/04 - 2028/03

  4. Establishment of a method for measuring hydrogen content in iron melts by neutron imaging

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Research (Exploratory)

    Institution: Tohoku University

    2024/06/28 - 2027/03/31

  5. 爆発的火山噴火を引き起こすマグマの破壊現象の解明：変形するマグマの時分割構造解析

    奥村 聡, 坂巻 竜也, 小園 誠史, 上杉 健太朗

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(A)

    Institution: 東北大学

    2022/04/01 - 2026/03/31

  6. Physical property and structure of liquid Fe at high pressure for investigating the Earth's core composition

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Kumamoto University

    2022/04/01 - 2025/03/31

  7. Determination of elastic properties of magma under high pressure: To understand the behavior of magma in the interior of the Earth

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2022/04/01 - 2025/03/31

  8. 液体鉄の高圧下での物性と構造から探る地球コア組成

    中島 陽一, 坂巻 竜也, PUSZTAI LASZLO, 松田 和博

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 熊本大学

    2022/04/01 - 2025/03/31

  9. Determination of elastic properties of magma under high pressure: To understand the behavior of magma in the interior of the Earth

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2022/04/01 - 2025/03/31

  10. Direct observation of mantle-water reaction in subduction zone using neutron imaging

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

    Category: Grant-in-Aid for Challenging Research (Exploratory)

    Institution: Tohoku University

    2021/07/09 - 2024/03/31

  11. Construction of the universal pressure scale to the Earth's core

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2020/04/01 - 2023/03/31

  12. Structure and brittle failure of magma under deformation revealed by time-resolved X-ray diffraction

    Satoshi Okumura

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

    Category: Grant-in-Aid for Challenging Research (Exploratory)

    Institution: Tohoku University

    2019/06/28 - 2021/03/31

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    Magma mainly consists of silicate melt (liquid), which results from the melting of rock, but it shows the transition from liquid- to solid-like behavior under deformation. This transition is a key mechanism for the cause of explosive volcanism. The transition occurs when magma deforms rapidly; however, the relationship between the transition and the atomic- and nanometer-scale structure of magma is unclear yet. In this study, we constructed an experimental system for time-resolved X-ray diffraction and small-angle scattering for deforming magma. Using this experimental system, we demonstrated that the atomic-scale structure of magma may not change during the transition from liquid- to solid-like behavior under deformation.

  13. Structure and brittle failure of magma under deformation revealed by time-resolved X-ray diffraction

    Satoshi Okumura

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Research (Exploratory)

    Institution: Tohoku University

    2019/06/28 - 2021/03/31

    More details Close

    Magma mainly consists of silicate melt (liquid), which results from the melting of rock, but it shows the transition from liquid- to solid-like behavior under deformation. This transition is a key mechanism for the cause of explosive volcanism. The transition occurs when magma deforms rapidly; however, the relationship between the transition and the atomic- and nanometer-scale structure of magma is unclear yet. In this study, we constructed an experimental system for time-resolved X-ray diffraction and small-angle scattering for deforming magma. Using this experimental system, we demonstrated that the atomic-scale structure of magma may not change during the transition from liquid- to solid-like behavior under deformation.

  14. The transition of magma from the early days to the present inferred from high-pressure magma science

    Sakamaki Tatsuya

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)

    Category: Grant-in-Aid for Young Scientists (A)

    Institution: Tohoku University

    2017/04/01 - 2021/03/31

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    Based on high-pressure experiments, I succeeded in clarifying the behavior of magma (molten rock) that has existed inside the Earth from the early stages of Earth formation to the present. In particular, I was able to collect a large amount of systematic experimental data regarding the structural properties and chemical composition dependence of magma and silicate glass. Furthermore, I could experimentally determine the melting conditions of the deep part of the Earth and propose an internal model of the Earth that can interpret geophysical exploration data.

  15. The transition of magma from the early days to the present inferred from high-pressure magma science Competitive

    Sakamaki Tatsuya

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (A)

    Institution: Tohoku University

    2017/04/01 - 2021/03/31

    More details Close

    Based on high-pressure experiments, I succeeded in clarifying the behavior of magma (molten rock) that has existed inside the Earth from the early stages of Earth formation to the present. In particular, I was able to collect a large amount of systematic experimental data regarding the structural properties and chemical composition dependence of magma and silicate glass. Furthermore, I could experimentally determine the melting conditions of the deep part of the Earth and propose an internal model of the Earth that can interpret geophysical exploration data.

  16. Structure measurement of hydrous magma using neutron diffraction: Understanding of pressure dependences of hydrogen position Competitive

    Sakamaki Tatsuya

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

    Category: Grant-in-Aid for Challenging Research (Exploratory)

    Institution: Tohoku University

    2017/06/30 - 2020/03/31

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    We succeeded in measuring the structure of hydrous magma at high pressure and temperature using X-ray and neutron diffraction techniques. One of the most important findings in this study is the pressure-induced anomalous change in the ordering of network structure: the periodicity of network structure of the hydrous magma extends up to 4 GPa and starts to shrink at much higher pressure. Since the structure of magma changes drastically around 4 GPa (120 km in depth), the behavior of the magma can be also varied. We can obtain a significant knowledge for understanding the magma behavior in the interior of the Earth.

  17. Creation of the best model of the Earth's core

    Ohtani Eiji

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

    Category: Grant-in-Aid for Scientific Research (S)

    Institution: Tohoku University

    2015/05/29 - 2020/03/31

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    We determined the phase relations, element partitioning, equation of state, sound velocity, and magnetic and crystallographic characteristics of core forming iron alloys by using synchrotron X-ray powder diffraction, inelastic X-ray scattering, and Mossbauer spectroscopy, and neutron powder diffraction. Based on these measurements, we elucidated properties of the iron-light element alloys, and clarified that silicon, oxygen, sulfur, and hydrogen as well as nickel are promising minor elements in the core. Moreover, it was clarified that silicon is the main constituent light element of the inner core. Furthermore, we revealed that the inner core consists of a mixture of hcp phase and B2 phase. We presented a model of the inner core which is composed of a two phase mixture of hcp and B2 phases. This model can explain the enigmatic features of the inner core, the low shear velocity and large Poisson's ratio, which cannot be accounted for by the conventional models of the inner core.

  18. 地球内核の組成と異方性の解明 Competitive

    坂巻 竜也

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 新学術領域研究(研究領域提案型)

    Category: 新学術領域研究(研究領域提案型)

    Institution: 東北大学

    2016/04/01 - 2018/03/31

    More details Close

    SPring-8のBL35XU、BL43LXUにおいてX線非弾性散乱とレーザー加熱式ダイアモンドアンビル高圧発生装置を組み合わせることで地球深部を再現した超高温高圧条件下での鉄・鉄合金（地球核の模擬物質）の音速を測定した。 純鉄：200GPaを超える超高圧下で微小鉄試料からのX線非弾性散乱の取得するための最適な測定系の構築を進めた。そのシステムを用いて試料由来の非常に弱いシグナルを得られることを確認し、300GPaまでの測定に成功した。また、X線に対して透明なベリリウムガスケットを用いることでダイアモンドアンビルセルの加圧軸に対して同軸と垂直軸の2方向からのX線非弾性散乱測定を試み、試料の選択配向性と音速の関連性を明らかにした。これらは内核の異方性解明に繋がる研究成果である。 酸化鉄：下部マントル条件下で音速を測定し、同条件下では下部マントル構成鉱物より速度が遅いことを明らかにした。最下部マントルで報告されている地震学的低速度域の存在は、外核との反応などによってマントル中に酸化鉄が富化されることによってもたらされる可能性を示した。 鉄-珪素合金：鉄-珪素合金の音速を高温高圧下で測定した。鉄の音速-密度データと比較することで鉄中に珪素が含まれることと音速と密度の両方を減少させることが分かった。実際の地球の内核は純鉄より音速・密度共に小さいため、この差を埋めるためには珪素の存在が効果的であり、核中に含まれている軽元素の有力候補として珪素が挙げられることを示した。 鉄-ニッケル合金：ニッケルが鉄中に含まれることで同じ温度圧力条件下で密度が増加し、音速が減少することを明らかにした。また、観測されている地球核の音速-密度の傾きを説明するためには内核中に化学組成のグラデーションが必要であることを示した。

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

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

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Osaka University

    2014/04/01 - 2018/03/31

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    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.

  20. Experimental reproduction of whole melting Earth: elucidation of the internal differentiation processes of early Earth

    Murakami Motohiko

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2013/04/01 - 2017/03/31

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    We carried out the experimental research on the structural changes of the deep mantle materials by using Brillouin scattering and Raman scattering measurement system in a laser diamond anvil cell high-pressure and high-temperature apparatus, which can achieve to reproduce the relevant condition to the deep Earth. By establishing the combined spectroscopic measurement system under high pressure and high temperature condition, we succeeded to obtain insight into the structural changes not only for the solid phases but also liquid phases under high-pressure and high-temperature condition. This result will give us the important information to constraint on the internal evolution of the early Earth.

  21. Determination of sound velocity - density and melting relation of iron-alloys under high pressure and high temperature conditions Competitive

    Sakamaki Tatsuya

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Tohoku University

    2013/04/01 - 2016/03/31

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    <BR> Hexagonal close-packed iron (hcp-Fe) is a main component of Earth's inner core. The difference in density between hcp-Fe and the inner core in the Preliminary Reference Earth Model (PREM) shows a density deficit, which implies an existence of light elements in the core. Sound velocities then provide an important constraint on the amount and kind of light elements in the core. This study shows the compressional sound velocity (Vp) of hcp-Fe up to 163 GPa and 3000 K using inelastic x-ray scattering from a laser-heated sample in a diamond anvil cell. The result indicates that Earth's inner core has a 4 to 5% smaller density and a 4 to 10% smaller Vp than hcp-Fe. This demonstrates that components other than Fe in Earth’s core are required to explain Earth's core density and velocity deficits compared to hcp-Fe. Hydrogen is a good candidate; thus, Earth's core may be a hidden hydrogen reservoir. In addition, silicon and sulfur are also possible candidates.

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

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

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research

    Category: Grant-in-Aid for Specially Promoted Research

    Institution: Tohoku University

    2010/04/21 - 2015/03/31

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    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.

  23. 高温高圧下における鉄合金メルトの密度と音速測定

    坂巻 竜也

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 研究活動スタート支援

    Category: 研究活動スタート支援

    Institution: 東北大学

    2012/08/31 - 2014/03/31

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    地震学的観測事実から地球は中心部から順に核・マントル・地殻で構成されていることが分かっている。さらに地球の核は中心に固体の内核があり、それ覆うように液体の外核が存在していることも明らかになっている。また、地球化学的見地から地球の核は主に鉄から成っていると考えられている。しかしながら、100万気圧を超える圧力条件下であるため地殻やマントルの研究に比べて核の研究は十分ではない。核に関しては、地球内部の地震波速度モデルによって地震波速度(音速)と密度は報告されている。ここで重要な研究テーマは観測データにあうような核の組成を決定することである。そこで本研究では、地震波速度モデルと直接比較するために地球核の温度圧力条件下において純鉄の音速と密度測定を行うことを目的とする。 大型放射光施設SPring-8にあるビームラインBL35XUにおいて圧力条件100GPaまでの純鉄の音速・密度測定に成功した。ダイアモンドアンビル高圧発生装置を両面レーザーで加熱することによって、安定して2000K以上の高温下での測定が行えた。過去の研究でレーザー加熱ダイアモンドアンビルセルとX線非弾性散乱実験を組み合わせた例はなく、今まで成されていない2000Kを超える高温条件で測定することによって、温度の影響を明らかにすることができた。また、フラットパネルを利用した2次元のX線回折パターンの取得することで、音速測定時と同一条件下において試料の密度を求めることにも成功した。音速-密度の相関は線形を示すことが知られており、これら2つの物性を同時に測定することによって、高温下での相関を明らかにした。

  24. 高温高圧条件下における無水・含水玄武岩マグマの密度及び構造の決定

    坂巻 竜也

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 東北大学

    2007 - 2009

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    地球内部の分化にはマグマの移動が密接に関与しており、マグマの様々な物性を調べることは火成活動や地球の進化を解明する上で重要である。特にマグマの密度を求めることは、過去における地球の進化から現在の地球の構造を解明する上で不可欠な研究となってくる。また、圧力増加に伴うマグマの物性変化がどのような構造変化に起因しているのかを解明し、マグマの構造変化様式を一般化することは重要である。そのためには地球内部の条件を再現した高温高圧条件下においてマグマの密度測定・構造測定を行う必要がある。 上記にあるような本研究の目的である高温高圧下における玄武岩マグマの密度及び構造の決定に向けて、SPring-8などの大型放射光施設を利用し、実験を重ねている。3年目の目標として掲げていたエネルギー分散X線回折法を用いた玄武岩マグマの構造解析に関して、当初の予定通り無水条件下において約10GPaの圧力条件まで実験に成功し、圧力起因の構造変化を明らかにした。玄武岩マグマの密度測定結果と比較することによって、玄武岩マグマの圧力増加に伴う高密度化が網目形成イオンの配位数増加によって生じていることを解明した。粘度の圧力依存性とも比較することによって、高温高圧下におけるマグマの密度-粘度-構造に関して総括的に理解することに成功した。これは世界で初めての研究であり、国際学会のAIRAPTで発表した。 X線吸収法によるマグマの密度測定は、玄武岩マグマだけでなく組成の異なるペリドタイトマグマ・月の玄武岩マグマに関しても行い、約5GPaまでの圧力条件下において密度測定に成功している。非常に重要な結果が得られたため、投稿論文としてまとめ、American Mineralogist、 Earth and Planetary Science Lettersに掲載された。

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Social Activities 3

  1. 地球内核の組成制約に成功―世界最高の高温高圧条件下で鉄の音速・密度同時測定―

    2016/02/27 -

  2. リソスフェア―アセノスフェア間に溜まるマグマ（プレートの下ではマグマが渋滞！？）

    2013/10/25 -

  3. 学都「仙台・宮城」サイエンス・デイ

    2013/07/21 -