World's Best Scientists 2026 revealed!
Hiroyuki Kagi

Hiroyuki Kagi

D-Index & Metrics

Environmental Sciences

D-Index
44
Citations
6772
World Ranking
6809
National Ranking
128

Hiroyuki Kagi publication distribution in Environmental Sciences in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Environmental Sciences in 2026. The highlighted bar marks where Hiroyuki Kagi sits on this spectrum.

41–50 publications: 21 scientists 51–60 publications: 62 scientists 61–70 publications: 133 scientists 71–80 publications: 257 scientists 81–90 publications: 361 scientists 91–100 publications: 440 scientists 101–110 publications: 492 scientists 111–120 publications: 541 scientists 121–130 publications: 617 scientists 131–140 publications: 544 scientists 141–150 publications: 541 scientists 151–160 publications: 539 scientists 161–170 publications: 444 scientists 171–180 publications: 444 scientists 181–190 publications: 400 scientists 191–200 publications: 377 scientists 201–210 publications: 318 scientists 211–220 publications: 283 scientists 221–230 publications: 263 scientists 231–240 publications: 220 scientists 241–250 publications: 217 scientists 251–260 publications: 180 scientists 261–270 publications: 181 scientists 271–280 publications: 155 scientists 281–290 publications: 130 scientists 291–300 publications: 127 scientists 301–310 publications: 130 scientists 311–320 publications: 85 scientists 321–330 publications: 106 scientists 331–340 publications: 80 scientists 341–350 publications: 83 scientists 351–360 publications: 75 scientists 361–370 publications: 69 scientists 371–380 publications: 52 scientists 381–390 publications: 54 scientists 391–400 publications: 56 scientists 401–410 publications: 44 scientists 411–420 publications: 40 scientists 421–430 publications: 36 scientists 431–440 publications: 25 scientists 441–450 publications: 25 scientists 451–460 publications: 32 scientists 461–470 publications: 29 scientists 471–480 publications: 21 scientists 481–490 publications: 26 scientists 491–500 publications: 25 scientists 501–510 publications: 17 scientists 511–520 publications: 18 scientists 521–530 publications: 15 scientists 531–540 publications: 22 scientists 541–550 publications: 12 scientists 551–560 publications: 15 scientists 561–570 publications: 11 scientists 571–580 publications: 19 scientists 581–590 publications: 9 scientists 591–600 publications: 9 scientists 601–610 publications: 7 scientists 611–620 publications: 11 scientists 621–630 publications: 5 scientists 631–640 publications: 5 scientists 641–650 publications: 6 scientists 651–660 publications: 3 scientists 661–670 publications: 3 scientists 671–680 publications: 4 scientists 681–686 publications: 3 scientists 687+ publications: 100 scientists
41 publications 687+

This scientist: 359 publications — 91st percentile

91% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 687 publications or more.

Hiroyuki Kagi D-index placement in Environmental Sciences in 2026

The chart shows the D-index (discipline H-index) distribution of Environmental Sciences scientists ranked by Research.com in 2026. The highlighted bar marks where Hiroyuki Kagi sits on this spectrum.

30 D-Index: 12 scientists 31 D-Index: 26 scientists 32 D-Index: 51 scientists 33 D-Index: 88 scientists 34 D-Index: 123 scientists 35 D-Index: 163 scientists 36 D-Index: 206 scientists 37 D-Index: 267 scientists 38 D-Index: 265 scientists 39 D-Index: 275 scientists 40 D-Index: 321 scientists 41 D-Index: 343 scientists 42 D-Index: 305 scientists 43 D-Index: 336 scientists 44 D-Index: 330 scientists 45 D-Index: 348 scientists 46 D-Index: 291 scientists 47 D-Index: 275 scientists 48 D-Index: 272 scientists 49 D-Index: 273 scientists 50 D-Index: 263 scientists 51 D-Index: 232 scientists 52 D-Index: 266 scientists 53 D-Index: 217 scientists 54 D-Index: 199 scientists 55 D-Index: 177 scientists 56 D-Index: 202 scientists 57 D-Index: 204 scientists 58 D-Index: 166 scientists 59 D-Index: 177 scientists 60 D-Index: 166 scientists 61 D-Index: 152 scientists 62 D-Index: 143 scientists 63 D-Index: 150 scientists 64 D-Index: 124 scientists 65 D-Index: 119 scientists 66 D-Index: 120 scientists 67 D-Index: 118 scientists 68 D-Index: 82 scientists 69 D-Index: 98 scientists 70 D-Index: 94 scientists 71 D-Index: 105 scientists 72 D-Index: 74 scientists 73 D-Index: 84 scientists 74 D-Index: 70 scientists 75 D-Index: 67 scientists 76 D-Index: 78 scientists 77 D-Index: 60 scientists 78 D-Index: 59 scientists 79 D-Index: 52 scientists 80 D-Index: 47 scientists 81 D-Index: 38 scientists 82 D-Index: 48 scientists 83 D-Index: 42 scientists 84 D-Index: 42 scientists 85 D-Index: 43 scientists 86 D-Index: 29 scientists 87 D-Index: 37 scientists 88 D-Index: 29 scientists 89 D-Index: 30 scientists 90 D-Index: 34 scientists 91 D-Index: 20 scientists 92 D-Index: 22 scientists 93 D-Index: 17 scientists 94 D-Index: 19 scientists 95 D-Index: 24 scientists 96 D-Index: 21 scientists 97 D-Index: 20 scientists 98 D-Index: 24 scientists 99 D-Index: 17 scientists 100 D-Index: 17 scientists 101 D-Index: 21 scientists 102 D-Index: 25 scientists 103 D-Index: 18 scientists 104 D-Index: 26 scientists 105 D-Index: 19 scientists 106 D-Index: 15 scientists 107 D-Index: 10 scientists 108 D-Index: 13 scientists 109 D-Index: 15 scientists 110 D-Index: 12 scientists 111 D-Index: 8 scientists 112 D-Index: 7 scientists 113 D-Index: 9 scientists 114 D-Index: 6 scientists 115 D-Index: 12 scientists 116 D-Index: 7 scientists 117 D-Index: 8 scientists 118 D-Index: 3 scientists 119 D-Index: 5 scientists 120 D-Index: 7 scientists 121 D-Index: 2 scientists 122 D-Index: 4 scientists 123 D-Index: 8 scientists 124 D-Index: 7 scientists 125+ D-Index: 99 scientists
30 D-Index 125+

This scientist: 44 D-Index — 32nd percentile

32% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 125 D-Index or more.

Overview

Hiroyuki Kagi is affiliated with the University of Tokyo in Japan and specializes in materials science and earth and planetary sciences. Their research outputs encompass a variety of topics within these fields, focusing extensively on materials chemistry and geophysics as well as contributions to astronomy, inorganic chemistry, and biomaterials.

The scientist's recent publications cover a range of subjects predominantly related to high-pressure geophysics, crystallization processes, and geological and geochemical analysis. Notable papers include:

  • Experimental evidence for the existence of a second partially-ordered phase of ice VI (2021, Nature Communications)
  • Deep microbial proliferation at the basalt interface in 33.5-104 million-year-old oceanic crust (2020, Communications Biology)
  • Incorporation of Incompatible Strontium and Barium Ions into Calcite (CaCO3) through Amorphous Calcium Carbonate (2020, Minerals)
  • Anomalous hydrogen dynamics of the ice VII-VIII transition revealed by high-pressure neutron diffraction (2020, Proceedings of the National Academy of Sciences)
  • Hydrogen bond symmetrisation in D2O ice observed by neutron diffraction (2024, Nature Communications)

The primary research topics addressed by their work are:

  • High-pressure geophysics and materials
  • Crystallization and solubility studies
  • X-ray diffraction in crystallography
  • Geological and geochemical analysis
  • Earthquake and tectonic studies
  • Methane hydrates and related phenomena
  • Calcium carbonate crystallization and inhibition

Frequent co-authors who collaborate with Hiroyuki Kagi include:

  • Kazuki Komatsu
  • Takanori Hattori
  • Asami Sano-Furukawa
  • Shinichi Machida
  • Stefan Klotz

Their research findings have appeared in several publication venues, with multiple works in:

  • The Cambridge Structural Database
  • Journal of Raman Spectroscopy
  • Nature Communications
  • American Mineralogist
  • Scientific Reports

Hiroyuki Kagi's contributions span various subfields focused on the chemical and physical behavior of materials under diverse conditions, particularly examining the structure and dynamics of water ices and carbonate minerals under high pressure. Their interdisciplinary approach integrates materials chemistry with geophysics, supporting studies relevant to earth and planetary processes.

Best Publications

  • Direct observation of tetravalent cerium in ferromanganese nodules and crusts by X-ray-absorption near-edge structure (XANES)

    Yoshio Takahashi;Hiroshi Shimizu;Akira Usui;Hiroyuki Kagi

  • Changes in the structure of water deduced from the pressure dependence of the Raman OH frequency

    Tatsuhiko Kawamoto;Shukichi Ochiai;Hiroyuki Kagi

  • Mg and Fe-rich carbonate–silicate high-density fluids in cuboid diamonds from the Internationalnaya kimberlite pipe (Yakutia)

    D.A. Zedgenizov;A.L. Ragozin;V.S. Shatsky;D. Araujo

  • Carbonatitic melts in cuboid diamonds from Udachnaya kimberlite pipe (Yakutia): evidence from vibrational spectroscopy

    D. A. Zedgenizov;H. Kagi;V. S. Shatsky;N. V. Sobolev

  • An Explanation of Episodic Tremor and Slow Slip Constrained by Crack-Seal Veins and Viscous Shear in Subduction Mélange

    Kohtaro Ujiie;Kohtaro Ujiie;Hanae Saishu;Åke Fagereng;Naoki Nishiyama

  • Micro-Raman Densimeter for CO2 Inclusions in Mantle-Derived Minerals

    Yoko Kawakami;Junji Yamamoto;Hiroyuki Kagi

  • High hydrogen solubility in Al-rich stishovite and water transport in the lower mantle

    Konstantin D. Litasov;Hiroyuki Kagi;Anton Shatskiy;Eiji Ohtani

  • Composition of trapped fluids in cuboid fibrous diamonds from the Udachnaya kimberlite: LAM-ICPMS analysis

    D.A. Zedgenizov;S. Rege;W.L. Griffin;H. Kagi

  • Design and performance of high-pressure PLANET beamline at pulsed neutron source at J-PARC

    T. Hattori;A. Sano-Furukawa;H. Arima;K. Komatsu

  • Fossil pressures of fluid inclusions in mantle xenoliths exhibiting rheology of mantle minerals: implications for the geobarometry of mantle minerals using micro-Raman spectroscopy

    Junji Yamamoto;Hiroyuki Kagi;Ichiro Kaneoka;Yong Lai

  • Proper understanding of down-shifted Raman spectra of natural graphite: Direct estimation of laser-induced rise in sample temperature

    Hiroyuki Kagi;Ikari Tsuchida;Masao Wakatsuki;Kazuya Takahashi

  • Integrated-fin gasket for palm cubic-anvil high pressure apparatus.

    J.-G. Cheng;K. Matsubayashi;S. Nagasaki;A. Hisada

  • Change in compressibility of δ-AlOOH and δ-AlOOD at high pressure: A study of isotope effect and hydrogen-bond symmetrization

    Asami Sano-Furukawa;Asami Sano-Furukawa;Hiroyuki Kagi;Takaya Nagai;Satoshi Nakano

  • Local variations of carbon isotope composition in diamonds from São-Luis (Brazil): Evidence for heterogenous carbon reservoir in sublithospheric mantle

    D.A. Zedgenizov;D.A. Zedgenizov;H. Kagi;V.S. Shatsky;A.L. Ragozin;A.L. Ragozin

  • Extended Micro-Raman Densimeter for CO2 Applicable to Mantle-originated Fluid Inclusions

    Junji Yamamoto;Hiroyuki Kagi

  • High concentration of water in stishovite in the MORB system

    Jung In Chung;Jung In Chung;Hiroyuki Kagi

  • Diamond-graphite relationships in ultrahigh-pressure metamorphic rocks from the Kokchetav Massif, northern Kazakhstan

    Andrey V. Korsakov;Maria Perraki;Dmitry A. Zedgenizov;Luca Bindi

  • Evidence for subduction-related components in the subcontinental mantle from low 3He/4He and 40Ar/36Ar ratio in mantle xenoliths from Far Eastern Russia

    Junji Yamamoto;Ichiro Kaneoka;Shun'ichi Nakai;Hiroyuki Kagi

  • A new method for the determination of CeIII/CeIV ratios in geological materials; application for weathering, sedimentary and diagenetic processes

    Yoshio Takahashi;Hiroshi Shimizu;Hiroyuki Kagi;Hidekazu Yoshida

  • Tritium in Japanese precipitation following the March 2011 Fukushima Daiichi Nuclear Plant accident.

    Takuya Matsumoto;Teruyuki Maruoka;Gen Shimoda;Hajime Obata

  • Experimental alteration of molybdenite: evaluation of the Re–Os system, infrared spectroscopic profile and polytype

    Katsuhiko Suzuki;Hiroyuki Kagi;Masayuki Nara;Bokuichiro Takano

  • CHEMICAL PROPERTIES OF CENTRAL AFRICAN CARBONADO AND ITS GENETIC IMPLICATIONS

    Hiroyuki Kagi;Kazuya Takahashi;Hiroshi Hidaka;Akimasa Masuda

  • Evidence for ice VI as an inclusion in cuboid diamonds from high P-T near infrared spectroscopy

    H. Kagi;H. Kagi;R. Lu;P. Davidson;A. F. Goncharov

  • Hydrogen bonding interactions in phase A [Mg 7 Si 2 O 8 (OH) 6 ] at ambient and high pressure

    H. Kagi;J. B. Parise;H. Cho;G. R. Rossman

Frequent Co-Authors

Takehiko Yagi
Takehiko Yagi University of Tokyo
Vladislav S. Shatsky
Vladislav S. Shatsky Russian Academy of Sciences
Kohtaro Ujiie
Kohtaro Ujiie University of Tsukuba
Konstantin D. Litasov
Konstantin D. Litasov Institute for High Pressure Physics
Toru Inoue
Toru Inoue Hiroshima University
John B. Parise
John B. Parise Stony Brook University
Tetsuo Irifune
Tetsuo Irifune Ehime University
Eiji Ohtani
Eiji Ohtani Tohoku University
Shoji Arai
Shoji Arai Kanazawa University
Katsuhiko Suzuki
Katsuhiko Suzuki Japan Agency for Marine-Earth Science and Technology

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