Takuo Okuchi

  • 730 Citations
  • 15 h-Index
19972019
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Research Output 1997 2019

  • 730 Citations
  • 15 h-Index
  • 65 Article
  • 2 Chapter
  • 1 Conference contribution
  • 1 Review article
2019

Iron isotopic fractionation in mineral phases from Earth's lower mantle: Did terrestrial magma ocean crystallization fractionate iron isotopes?

Yang, H., Lin, J. F., Hu, M. Y., Roskosz, M., Bi, W., Zhao, J., Alp, E. E., Liu, J., Liu, J., Wentzowitch, R. M., Okuchi, T. & Dauphas, N., Jan 15 2019, In : Earth and Planetary Science Letters. 506, p. 113-122 10 p.

Research output: Contribution to journalArticle

Iron Isotopes
iron isotopes
isotopic fractionation
lower mantle
Fractionation
2018

Abnormal Elasticity of Fe-Bearing Bridgmanite in the Earth's Lower Mantle

Fu, S., Yang, J., Zhang, Y., Okuchi, T., McCammon, C., Kim, H. I., Lee, S. K. & Lin, J. F., May 28 2018, In : Geophysical Research Letters. 45, 10, p. 4725-4732 8 p.

Research output: Contribution to journalArticle

light scattering
lower mantle
elasticity
Earth mantle
elastic properties
1 Citations

Determination of hydrogen site and occupancy in hydrous Mg2SiO4 spinel by single-crystal neutron diffraction

Purevjav, N., Okuchi, T., Wang, X., Hoffmann, C. & Tomioka, N., Feb 1 2018, In : Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials. 74, 1, p. 115-120 6 p.

Research output: Contribution to journalArticle

Neutron diffraction
spinel
neutron diffraction
Hydrogen
Cations
1 Citations

Effects of iron on the lattice thermal conductivity of Earth’s deep mantle and implications for mantle dynamics

Hsieh, W. P., Deschamps, F., Okuchi, T. & Lin, J. F., Apr 17 2018, In : Proceedings of the National Academy of Sciences of the United States of America. 115, 16, p. 4099-4104 6 p.

Research output: Contribution to journalArticle

Thermal Conductivity
Iron
Pressure
Diamond
Hot Temperature

Melting behavior of the lower-mantle ferropericlase across the spin crossover: Implication for the ultra-low velocity zones at the lowermost mantle

Fu, S., Yang, J., Zhang, Y., Liu, J., Greenberg, E., Prakapenka, V. B., Okuchi, T. & Lin, J. F., Dec 1 2018, In : Earth and Planetary Science Letters. 503, p. 1-9 9 p.

Research output: Contribution to journalArticle

low velocity zone
lower mantle
low speed
crossovers
Earth mantle

Quasielastic neutron scattering of brucite to analyse hydrogen transport on the atomic scale

Okuchi, T., Tomioka, N., Purevjav, N. & Shibata, K., Jan 1 2018, (Accepted/In press) In : Journal of Applied Crystallography.

Research output: Contribution to journalArticle

Magnesium Hydroxide
Neutrons
Neutron scattering
Hydrogen
Crystal lattices
2017
5 Citations

Dynamic fracture of tantalum under extreme tensile stress

Albertazzi, B., Ozaki, N., Zhakhovsky, V., Faenov, A., Habara, H., Harmand, M., Hartley, N., Ilnitsky, D., Inogamov, N., Inubushi, Y., Ishikawa, T., Katayama, T., Koyama, T., Koenig, M., Krygier, A., Matsuoka, T., Matsuyama, S., McBride, E., Migdal, K. P., Morard, G. & 21 othersOhashi, H., Okuchi, T., Pikuz, T., Purevjav, N., Sakata, O., Sano, Y., Sato, T., Sekine, T., Seto, Y., Takahashi, K., Tanaka, K., Tange, Y., Togashi, T., Tono, K., Umeda, Y., Vinci, T., Yabashi, M., Yabuuchi, T., Yamauchi, K., Yumoto, H. & Kodama, R., Jun 1 2017, In : Science advances. 3, 6, e1602705.

Research output: Contribution to journalArticle

Tantalum
X-Ray Diffraction
Lasers
X-Rays
Electrons
5 Citations

Equation of state and hyperfine parameters of high-spin bridgmanite in the Earth's lower mantle by synchrotron X-ray diffraction and Mössbauer spectroscopy

Mao, Z., Wang, F., Lin, J. F., Fu, S., Yang, J., Wu, X., Okuchi, T., Tomioka, N., Prakapenka, V. B., Xiao, Y. & Chow, P., Feb 1 2017, In : American Mineralogist. 102, 2, p. 357-368 12 p.

Research output: Contribution to journalArticle

Mossbauer spectroscopy
lower mantle
Synchrotrons
Equations of state
equation of state
6 Citations

Hydrogenation of iron in the early stage of Earth's evolution

Iizuka-Oku, R., Yagi, T., Gotou, H., Okuchi, T., Hattori, T. & Sano-Furukawa, A., Jan 13 2017, In : Nature Communications. 8, 14096.

Research output: Contribution to journalArticle

Hydrogenation
hydrogenation
Iron
Earth (planet)
iron
5 Citations

Reduced lattice thermal conductivity of Fe-bearing bridgmanite in Earth's deep mantle

Hsieh, W. P., Deschamps, F., Okuchi, T. & Lin, J. F., 2017, (Accepted/In press) In : Journal of Geophysical Research: Solid Earth.

Research output: Contribution to journalArticle

Bearings (structural)
thermal conductivity
Thermal conductivity
Earth mantle
Earth (planet)
8 Citations

Ultrafast observation of lattice dynamics in laser-irradiated gold foils

Hartley, N. J., Ozaki, N., Matsuoka, T., Albertazzi, B., Faenov, A., Fujimoto, Y., Habara, H., Harmand, M., Inubushi, Y., Katayama, T., Koenig, M., Krygier, A., Mabey, P., Matsumura, Y., Matsuyama, S., McBride, E. E., Miyanishi, K., Morard, G., Okuchi, T., Pikuz, T. & 15 othersSakata, O., Sano, Y., Sato, T., Sekine, T., Seto, Y., Takahashi, K., Tanaka, K. A., Tange, Y., Togashi, T., Umeda, Y., Vinci, T., Yabashi, M., Yabuuchi, T., Yamauchi, K. & Kodama, R., Feb 13 2017, In : Applied Physics Letters. 110, 7, 071905.

Research output: Contribution to journalArticle

foils
gold
expansion
diffraction
free electron lasers
2016
1 Citations

A Peltier cooling diamond anvil cell for low-temperature Raman spectroscopic measurements

Noguchi, N. & Okuchi, T., Dec 1 2016, In : Review of Scientific Instruments. 87, 12, 125107.

Research output: Contribution to journalArticle

anvils
Cooling systems
Diamonds
modules
diamonds
8 Citations

EXAFS studies under high pressure by X-ray Raman scattering

Hiraoka, N., Fukui, H. & Okuchi, T., Jul 15 2016, (Accepted/In press) In : High Pressure Research. p. 1-12 12 p.

Research output: Contribution to journalArticle

fine structure
Raman spectra
light elements
x rays
glass
9 Citations

High-spin Fe2+ and Fe3+ in single-crystal aluminous bridgmanite in the lower mantle

Lin, J. F., Mao, Z., Yang, J., Liu, J., Xiao, Y., Chow, P. & Okuchi, T., Jul 16 2016, In : Geophysical Research Letters. 43, 13, p. 6952-6959 8 p.

Research output: Contribution to journalArticle

lower mantle
Earth mantle
crystal
iron
Mossbauer spectroscopy

Hydrogen site analyses of dense hydrous mantle minerals by pulsed neutron powder diffraction

Okuchi, T., Tomioka, N. & Purevjav, N., 2016, In : Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu. 26, 2, p. 140-148 9 p.

Research output: Contribution to journalReview article

Neutron powder diffraction
Minerals
Hydrogen
Earth mantle
minerals
4 Citations

Indirect monitoring shot-to-shot shock waves strength reproducibility during pump-probe experiments

Pikuz, T. A., Faenov, A. Y., Ozaki, N., Hartley, N. J., Albertazzi, B., Matsuoka, T., Takahashi, K., Habara, H., Tange, Y., Matsuyama, S., Yamauchi, K., Ochante, R., Sueda, K., Sakata, O., Sekine, T., Sato, T., Umeda, Y., Inubushi, Y., Yabuuchi, T., Togashi, T. & 16 othersKatayama, T., Yabashi, M., Harmand, M., Morard, G., Koenig, M., Zhakhovsky, V., Inogamov, N., Safronova, A. S., Stafford, A., Skobelev, I. Y., Pikuz, S. A., Okuchi, T., Seto, Y., Tanaka, K. A., Ishikawa, T. & Kodama, R., Jul 21 2016, In : Journal of Applied Physics. 120, 3, 035901.

Research output: Contribution to journalArticle

shot
shock waves
pumps
probes
lasers
3 Citations

Quantitative analysis of hydrogen sites and occupancy in deep mantle hydrous wadsleyite using single crystal neutron diffraction

Purevjav, N., Okuchi, T., Tomioka, N., Wang, X. & Hoffmann, C., Oct 11 2016, In : Scientific Reports. 6, 34988.

Research output: Contribution to journalArticle

wadsleyite
neutron diffraction
quantitative analysis
hydration
hydrogen
4 Citations

Self-diffusion of protons in H2O ice VII at high pressures: Anomaly around 10 GPa

Noguchi, N. & Okuchi, T., Jun 21 2016, In : Journal of Chemical Physics. 144, 23, 234503.

Research output: Contribution to journalArticle

Ice
Protons
ice
anomalies
protons
2015
19 Citations

Elasticity of Ferropericlase across the Spin Crossover in the Earth's Lower Mantle

Yang, J., Tong, X., Lin, J. F., Okuchi, T. & Tomioka, N., Dec 1 2015, In : Scientific Reports. 5, 17188.

Research output: Contribution to journalArticle

crossovers
Earth mantle
elastic properties
softening
light scattering
4 Citations

Forge-hardened TiZr null-matrix alloy for neutron scattering under extreme conditions

Okuchi, T., Hoshikawa, A. & Ishigaki, T., Dec 9 2015, In : Metals. 5, 4, p. 2340-2350 11 p.

Research output: Contribution to journalArticle

Neutron scattering
Neutron beams
Metals
Coherent scattering
Alloying
4 Citations

Hydrogen sites in the dense hydrous magnesian silicate phase E: a pulsed neutron powder diffraction study

Tomioka, N., Okuchi, T., Purevjav, N., Abe, J. & Harjo, S., Dec 24 2015, (Accepted/In press) In : Physics and Chemistry of Minerals. p. 1-9 9 p.

Research output: Contribution to journalArticle

Magnesium Hydroxide
neutron diffraction
Silicates
Neutron powder diffraction
Powders
8 Citations

P - ρ - T measurements of H2O up to 260 GPa under laser-driven shock loading

Kimura, T., Ozaki, N., Sano, T., Okuchi, T., Sano, T., Shimizu, K., Miyanishi, K., Terai, T., Kakeshita, T., Sakawa, Y. & Kodama, R., Apr 28 2015, In : The Journal of Chemical Physics. 142, 16, 164504.

Research output: Contribution to journalArticle

shock
Lasers
lasers
Equations of state
equations of state
11 Citations

Synthesis of large and homogeneous single crystals of water-bearing minerals by slow cooling at deep-mantle pressures

Okuchi, T., Purevjav, N., Tomioka, N., Lin, J. F., Kuribayashi, T., Schoneveld, L., Hwang, H., Sakamoto, N., Kawasaki, N. & Yurimoto, H., Jul 1 2015, In : American Mineralogist. 100, 7, p. 1483-1492 10 p.

Research output: Contribution to journalArticle

Bearings (structural)
Minerals
Earth mantle
minerals
Single crystals
2014
11 Citations

Experimental study of thermal conductivity at high pressures: Implications for the deep Earth's interior

Goncharov, A. F., Lobanov, S. S., Tan, X., Hohensee, G. T., Cahill, D. G., Lin, J. F., Thomas, S. M., Okuchi, T. & Tomioka, N., Aug 25 2014, In : Physics of the Earth and Planetary Interiors. 247, p. 11-16 6 p.

Research output: Contribution to journalArticle

thermal conductivity
experimental study
lower mantle
Earth mantle
conductivity
11 Citations

Hydrogen site analysis of hydrous ringwoodite in mantle transition zone by pulsed neutron diffraction

Purevjav, N., Okuchi, T., Tomioka, N., Abe, J. & Harjo, S., Oct 16 2014, In : Geophysical Research Letters. 41, 19, p. 6718-6724 7 p.

Research output: Contribution to journalArticle

ringwoodite
neutron diffraction
transition zone
Earth mantle
hydrogen
8 Citations

Structure refinement of sub-cubic-mm volume sample at high pressures by pulsed neutron powder diffraction: Application to brucite in an opposed anvil cell

Okuchi, T., Tomioka, N., Purevjav, N., Abe, J., Harjo, S. & Gong, W., Apr 3 2014, In : High Pressure Research. 34, 2, p. 273-280 8 p.

Research output: Contribution to journalArticle

brucite
anvils
neutrons
cells
diffraction
2013
9 Citations

Crossroads in Earth and Planetary Materials: H-D interdiffusion in brucite at pressures up to 15 GPa

Guo, X., Yoshino, T., Okuchi, T. & Tomioka, N., Nov 2013, In : American Mineralogist. 98, 11-12, p. 1919-1929 11 p.

Research output: Contribution to journalArticle

Magnesium Hydroxide
brucite
Deuterium
deuterium
Hydrogen
8 Citations

Pulsed neutron powder diffraction at high pressure by a capacity-increased sapphire anvil cell

Okuchi, T., Yoshida, M., Ohno, Y., Tomioka, N., Purevjav, N., Osakabe, T., Harjo, S., Abe, J., Aizawa, K. & Sasaki, S., Dec 1 2013, In : High Pressure Research. 33, 4, p. 777-786 10 p.

Research output: Contribution to journalArticle

anvils
sapphire
neutrons
cells
diffraction

水素クラスレートハイドレートの水素吸収反応速度と固体内拡散

Okuchi, T., 2013, In : 低温科学. 71, 1, p. 181-185 5 p.

Research output: Contribution to journalArticle

2012
3 Citations
Diamond
anvils
Hydrogen
Diamonds
diamonds
6 Citations

Neutron powder diffraction of small-volume samples at high pressure using compact opposed-anvil cells and focused beam

Okuchi, T., Sasaki, S., Ohno, Y., Abe, J., Arima, H., Osakabe, T., Hattori, T., Sano-Furukawa, A., Komatsu, K., Kagi, H., Utsumi, W., Harjo, S., Ito, T. & Aizawa, K., 2012, In : Journal of Physics: Conference Series. 377, 1, 012013.

Research output: Contribution to journalArticle

anvils
neutrons
cells
diffraction
neutron sources
2011
21 Citations

Laser-shock compression and Hugoniot measurements of liquid hydrogen to 55 GPa

Sano, T., Ozaki, N., Sakaiya, T., Shigemori, K., Ikoma, M., Kimura, T., Miyanishi, K., Endo, T., Shiroshita, A., Takahashi, H., Jitsui, T., Hori, Y., Hironaka, Y., Iwamoto, A., Kadono, T., Nakai, M., Okuchi, T., Otani, K., Shimizu, K., Kondo, T. & 2 othersKodama, R. & Mima, K., Feb 28 2011, In : Physical Review B - Condensed Matter and Materials Physics. 83, 5, 054117.

Research output: Contribution to journalArticle

liquid hydrogen
Hydrogen
Compaction
shock
Lasers
9 Citations

Phase boundary between perovskite and post-perovskite structures in MnGeO3 determined by in situ X-ray diffraction measurements using sintered diamond anvils

Yamazaki, D., Ito, E., Katsura, T., Yoshino, T., Zhai, S., Fukui, H., Shatskiy, A., Guo, X., Shan, S., Okuchi, T., Tange, Y., Higo, Y. & Funakoshi, K. I., Jan 2011, In : American Mineralogist. 96, 1, p. 89-92 4 p.

Research output: Contribution to journalArticle

Diamond
perovskite
Phase boundaries
anvils
diamond
2010

10 GPa級単結晶中性子磁気回折のための高圧力発生技術の開発

Okuchi, T., 2010, In : 高圧力の科学と技術. 20, 1, p. 72-75 4 p.

Research output: Contribution to journalArticle

3 Citations
Neutron diffraction
anvils
neutron diffraction
Single crystals
Aluminum Oxide
3 Citations

Hugoniot and temperature measurements of liquid hydrogen by laser-shock compression

Sano, T., Ozaki, N., Sakaiya, T., Shigemori, K., Ikoma, M., Kimura, T., Miyanishi, K., Endo, T., Shiroshita, A., Takahashi, H., Jitsui, T., Hori, Y., Hironaka, Y., Iwamoto, A., Kadono, T., Nakai, M., Okuchi, T., Otani, K., Shimizu, K., Kondo, T. & 2 othersKodama, R. & Mima, K., 2010, In : Journal of Physics: Conference Series. 244, PART 4, 042018.

Research output: Contribution to journalArticle

liquid hydrogen
temperature measurement
shock
gas giant planets
conducting fluids
8 Citations

Large-volume static compression using nano-polycrystalline diamond for opposed anvils in compact cells

Okuchi, T., Sasaki, S., Osakabe, T., Ohno, Y., Odake, S. & Kagi, H., 2010, In : Journal of Physics: Conference Series. 215, 012188.

Research output: Contribution to journalArticle

anvils
diamonds
cells
neutron scattering
nuclear magnetic resonance
19 Citations

Micro-/nanostructural investigation of laser-cut surfaces of single- and polycrystalline diamonds

Ohfuji, H., Okuchi, T., Odake, S., Kagi, H., Sumiya, H. & Irifune, T., Jul 2010, In : Diamond and Related Materials. 19, 7-9, p. 1040-1051 12 p.

Research output: Contribution to journalArticle

Diamond
Graphite
Diamonds
graphite
diamonds
1 Citations

Powder neutron diffraction using nano-polycrystalline diamond as opposed anvils

Okuchi, T., Sasaki, S., Ohno, Y., Komatsu, K., Kagi, H., Arima, H., Abe, J., Hattori, T., Sano, A., Sakabe, T., Utsumi, W., Harjo, S., Ito, T., Aizawa, K. & Irifune, T., 2010, In : Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu. 20, 2, p. 175-178 4 p.

Research output: Contribution to journalArticle

Diamond
Neutron powder diffraction
anvils
neutron diffraction
Diamonds
18 Citations

Resonant X-ray emission study of the lower-mantle ferropericlase at high pressures

Lin, J. F., Mao, Z., Jarrige, I., Xiao, Y., Chow, P., Okuchi, T., Hiraoka, N. & Jacobsen, S. D., Aug 2010, In : American Mineralogist. 95, 8-9, p. 1125-1131 7 p.

Research output: Contribution to journalArticle

lower mantle
Electronic states
Earth mantle
X rays
electronics
5 Citations

Significant static pressure increase in a precompression cell target for laser-driven advanced dynamic compression experiments

Kimura, T., Ozaki, N., Okuchi, T., Terai, T., Sano, T., Shimizu, K., Sano, T., Koenig, M., Hirose, A., Kakeshita, T., Sakawa, Y. & Kodama, R., May 2010, In : Physics of Plasmas. 17, 5, 054502.

Research output: Contribution to journalArticle

static pressure
shock
condensed matter physics
cells
lasers
3 Citations

Static compression experiments for advanced coupling techniques of laser-driven dynamic compression and precompression target

Kimura, T., Ozaki, N., Okuchi, T., Mashimo, T., Miyanishi, K., Endo, T., Jitsui, T., Hirose, A., Ikoma, M., Kakeshita, T., Sakawa, Y., Sano, T., Sano, T., Shimizu, K., Terai, T. & Kodama, R., 2010, In : Journal of Physics: Conference Series. 215, 012152.

Research output: Contribution to journalArticle

shock
lasers
anvils
cells
predictions
2009
Hydrates
hydrates
Hydrogen
nuclear magnetic resonance
hydrogen

Introduction of the high pressure neutron diffraction projects in J-PARC

Nagai, T., Arima, H., Okuchi, T., Kagi, H. & Yagi, T., 2009, In : Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu. 19, 1, p. 15-23 9 p.

Research output: Contribution to journalArticle

Neutron diffraction
neutron diffraction
Neutron beams
neutron beams
refractory materials
28 Citations

Micromachining and surface processing of the super-hard nano-polycrystalline diamond by three types of pulsed lasers

Okuchi, T., Ohfuji, H., Odake, S., Kagi, H., Nagatomo, S., Sugata, M. & Sumiya, H., Sep 2009, In : Applied Physics A: Materials Science and Processing. 96, 4, p. 833-842 10 p.

Research output: Contribution to journalArticle

Diamond
Micromachining
Pulsed lasers
Diamonds
Processing
11 Citations

Neutron powder diffraction under high pressure at J-PARC

Utsumi, W., Kagi, H., Komatsu, K., Arima, H., Nagai, T., Okuchi, T., Kamiyama, T., Uwatoko, Y., Matsubayashi, K. & Yagi, T., Feb 21 2009, In : Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 600, 1, p. 50-52 3 p.

Research output: Contribution to journalArticle

Neutron powder diffraction
neutrons
diffraction
Materials science
materials science
19 Citations

Pulsed laser processing of nano-polycrystalline diamond: A comparative study with single crystal diamond

Odake, S., Ohfuji, H., Okuchi, T., Kagi, H., Sumiya, H. & Irifune, T., May 2009, In : Diamond and Related Materials. 18, 5-8, p. 877-880 4 p.

Research output: Contribution to journalArticle

Diamond
Pulsed lasers
Diamonds
pulsed lasers
diamonds