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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Materials Science 56 8304 8028 475 457 330 10482

Takumi Kikegawa publications per year

The chart shows the history of publications by Takumi Kikegawa between 1983 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Takumi Kikegawa published across 43 years, from 1983 to 2025, averaging 8 papers a year. Output peaked at 22 publications in 2005. 3 of the 345 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1983 to 2025. Vertical axis: number of publications, 0 to 22. Peak 22 publications in 2005. 1983: 2 publications 1984: 1 publication 1985: 0 publications 1986: 2 publications 1987: 5 publications 1988: 2 publications 1989: 6 publications 1990: 10 publications 1991: 6 publications 1992: 4 publications 1993: 7 publications 1994: 3 publications 1995: 7 publications 1996: 6 publications 1997: 11 publications 1998: 13 publications 1999: 4 publications 2000: 8 publications 2001: 8 publications 2002: 19 publications 2003: 16 publications 2004: 17 publications 2005: 22 publications 2006: 11 publications 2007: 13 publications 2008: 18 publications 2009: 15 publications 2010: 19 publications 2011: 18 publications 2012: 6 publications 2013: 11 publications 2014: 8 publications 2015: 13 publications 2016: 5 publications 2017: 8 publications 2018: 11 publications 2019: 2 publications 2020: 1 publication 2021: 3 publications 2022: 1 publication 2023: 0 publications 2024: 1 publication 2025: 2 publications
1983 2025

345 publications in total across all disciplines

View publications per year as a table
Takumi Kikegawa: publications per year, 1983 to 2025
Year Publications
1983 2
1984 1
1985 0
1986 2
1987 5
1988 2
1989 6
1990 10
1991 6
1992 4
1993 7
1994 3
1995 7
1996 6
1997 11
1998 13
1999 4
2000 8
2001 8
2002 19
2003 16
2004 17
2005 22
2006 11
2007 13
2008 18
2009 15
2010 19
2011 18
2012 6
2013 11
2014 8
2015 13
2016 5
2017 8
2018 11
2019 2
2020 1
2021 3
2022 1
2023 0
2024 1
2025 2
Total 345
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Takumi Kikegawa publication distribution in Materials Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Materials Science in 2026. The highlighted bar marks where Takumi Kikegawa sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 57 bars. Horizontal axis: publications, 50–69 to 1,163+. Vertical axis: number of scientists, 0 to 891. Most scientists, 891, have 190–209 publications. The last bar groups every scientist with 1,163 publications or more. The highlighted bar, 330–349 publications, is where this scientist sits. 50–69 publications: 28 scientists 70–89 publications: 152 scientists 90–109 publications: 356 scientists 110–129 publications: 487 scientists 130–149 publications: 723 scientists 150–169 publications: 835 scientists 170–189 publications: 850 scientists 190–209 publications: 891 scientists 210–229 publications: 862 scientists 230–249 publications: 766 scientists 250–269 publications: 726 scientists 270–289 publications: 665 scientists 290–309 publications: 593 scientists 310–329 publications: 537 scientists 330–349 publications: 477 scientists 350–369 publications: 440 scientists 370–389 publications: 356 scientists 390–409 publications: 321 scientists 410–429 publications: 256 scientists 430–449 publications: 246 scientists 450–469 publications: 216 scientists 470–489 publications: 212 scientists 490–509 publications: 174 scientists 510–529 publications: 194 scientists 530–549 publications: 162 scientists 550–569 publications: 131 scientists 570–589 publications: 111 scientists 590–609 publications: 103 scientists 610–629 publications: 99 scientists 630–649 publications: 77 scientists 650–669 publications: 92 scientists 670–689 publications: 56 scientists 690–709 publications: 53 scientists 710–729 publications: 53 scientists 730–749 publications: 38 scientists 750–769 publications: 52 scientists 770–789 publications: 43 scientists 790–809 publications: 38 scientists 810–829 publications: 34 scientists 830–849 publications: 25 scientists 850–869 publications: 18 scientists 870–889 publications: 20 scientists 890–909 publications: 24 scientists 910–929 publications: 27 scientists 930–949 publications: 20 scientists 950–969 publications: 17 scientists 970–989 publications: 10 scientists 990–1,009 publications: 16 scientists 1,010–1,029 publications: 13 scientists 1,030–1,049 publications: 12 scientists 1,050–1,069 publications: 9 scientists 1,070–1,089 publications: 8 scientists 1,090–1,109 publications: 7 scientists 1,110–1,129 publications: 9 scientists 1,130–1,149 publications: 2 scientists 1,150–1,162 publications: 5 scientists 1,163+ publications: 100 scientists
50–69 publications 1,163+

This scientist: 330 publications — 66th percentile

66% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,163 publications or more.

View publications distribution as a table
Number of Materials Science scientists by publication count, Research.com 2026 ranking edition. Based on 12,847 ranked scientists.
Publications Scientists This scientist
50–69 28
70–89 152
90–109 356
110–129 487
130–149 723
150–169 835
170–189 850
190–209 891
210–229 862
230–249 766
250–269 726
270–289 665
290–309 593
310–329 537
330–349 477 330
350–369 440
370–389 356
390–409 321
410–429 256
430–449 246
450–469 216
470–489 212
490–509 174
510–529 194
530–549 162
550–569 131
570–589 111
590–609 103
610–629 99
630–649 77
650–669 92
670–689 56
690–709 53
710–729 53
730–749 38
750–769 52
770–789 43
790–809 38
810–829 34
830–849 25
850–869 18
870–889 20
890–909 24
910–929 27
930–949 20
950–969 17
970–989 10
990–1,009 16
1,010–1,029 13
1,030–1,049 12
1,050–1,069 9
1,070–1,089 8
1,090–1,109 7
1,110–1,129 9
1,130–1,149 2
1,150–1,162 5
1,163+ 100
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Takumi Kikegawa D-index placement in Materials Science in 2026

The chart shows the D-index (discipline H-index) distribution of Materials Science scientists ranked by Research.com in 2026. The highlighted bar marks where Takumi Kikegawa sits on this spectrum.

No. of scientists
200 400 600
Bar chart with 64 bars. Horizontal axis: D-Index, 40–41 to 165+. Vertical axis: number of scientists, 0 to 667. Most scientists, 667, have 52–53 D-Index. The last bar groups every scientist with 165 D-Index or more. The highlighted bar, 56–57 D-Index, is where this scientist sits. 40–41 D-Index: 211 scientists 42–43 D-Index: 450 scientists 44–45 D-Index: 612 scientists 46–47 D-Index: 612 scientists 48–49 D-Index: 598 scientists 50–51 D-Index: 657 scientists 52–53 D-Index: 667 scientists 54–55 D-Index: 621 scientists 56–57 D-Index: 597 scientists 58–59 D-Index: 610 scientists 60–61 D-Index: 587 scientists 62–63 D-Index: 606 scientists 64–65 D-Index: 533 scientists 66–67 D-Index: 490 scientists 68–69 D-Index: 469 scientists 70–71 D-Index: 378 scientists 72–73 D-Index: 421 scientists 74–75 D-Index: 359 scientists 76–77 D-Index: 323 scientists 78–79 D-Index: 299 scientists 80–81 D-Index: 230 scientists 82–83 D-Index: 210 scientists 84–85 D-Index: 195 scientists 86–87 D-Index: 203 scientists 88–89 D-Index: 175 scientists 90–91 D-Index: 175 scientists 92–93 D-Index: 142 scientists 94–95 D-Index: 121 scientists 96–97 D-Index: 117 scientists 98–99 D-Index: 107 scientists 100–101 D-Index: 88 scientists 102–103 D-Index: 85 scientists 104–105 D-Index: 68 scientists 106–107 D-Index: 62 scientists 108–109 D-Index: 57 scientists 110–111 D-Index: 45 scientists 112–113 D-Index: 49 scientists 114–115 D-Index: 50 scientists 116–117 D-Index: 34 scientists 118–119 D-Index: 38 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 29 scientists 124–125 D-Index: 28 scientists 126–127 D-Index: 24 scientists 128–129 D-Index: 33 scientists 130–131 D-Index: 28 scientists 132–133 D-Index: 21 scientists 134–135 D-Index: 20 scientists 136–137 D-Index: 23 scientists 138–139 D-Index: 17 scientists 140–141 D-Index: 12 scientists 142–143 D-Index: 17 scientists 144–145 D-Index: 21 scientists 146–147 D-Index: 13 scientists 148–149 D-Index: 11 scientists 150–151 D-Index: 14 scientists 152–153 D-Index: 13 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 10 scientists 158–159 D-Index: 7 scientists 160–161 D-Index: 4 scientists 162–163 D-Index: 4 scientists 164 D-Index: 3 scientists 165+ D-Index: 98 scientists
40–41 D-Index 165+

This scientist: 56 D-Index — 37th percentile

37% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 165 D-Index or more.

View D-Index distribution as a table
Number of Materials Science scientists by D-index, Research.com 2026 ranking edition. Based on 12,847 ranked scientists.
D-Index Scientists This scientist
40–41 211
42–43 450
44–45 612
46–47 612
48–49 598
50–51 657
52–53 667
54–55 621
56–57 597 56
58–59 610
60–61 587
62–63 606
64–65 533
66–67 490
68–69 469
70–71 378
72–73 421
74–75 359
76–77 323
78–79 299
80–81 230
82–83 210
84–85 195
86–87 203
88–89 175
90–91 175
92–93 142
94–95 121
96–97 117
98–99 107
100–101 88
102–103 85
104–105 68
106–107 62
108–109 57
110–111 45
112–113 49
114–115 50
116–117 34
118–119 38
120–121 37
122–123 29
124–125 28
126–127 24
128–129 33
130–131 28
132–133 21
134–135 20
136–137 23
138–139 17
140–141 12
142–143 17
144–145 21
146–147 13
148–149 11
150–151 14
152–153 13
154–155 9
156–157 10
158–159 7
160–161 4
162–163 4
164 3
165+ 98
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Overview

Takumi Kikegawa is affiliated with the High Energy Accelerator Research Organization in Japan, focusing on research in materials science and earth and planetary sciences. Their work spans several subfields, including geophysics, materials chemistry, physical and theoretical chemistry, condensed matter physics, and catalysis.

Their research primarily addresses topics such as high-pressure geophysics and materials, hydrogen storage and materials, crystallography and molecular interactions, geological and geochemical analysis, crystal structures and properties, boron and carbon nanomaterials research, and advanced NMR techniques and applications.

Takumi Kikegawa has published in several scientific venues, with multiple contributions to Inorganic Chemistry. Other publication venues include American Mineralogist, The Journal of Chemical Physics, Hyperfine Interactions, and The Journal of Physical Chemistry B.

Their recent papers include the following:

  • Phase Diagram Analysis of High-Pressure/High-Temperature Polymorphs of Ammonia Borane, 2024, Inorganic Chemistry
  • Influence of pressure-induced formation of dihydrogen bonds on lattice parameters, volume, and vibrational modes of ammonia borane, 2022, The Journal of Chemical Physics
  • Observation of Dihydrogen Bonds in High-Pressure Phases of Ammonia Borane by X-ray and Neutron Diffraction Measurements, 2021, Inorganic Chemistry
  • P-V-T equation of state of hydrous phase A up to 10.5 GPa, 2020, American Mineralogist
  • Pressure-Induced Dehydration and Reversible Recrystallization of Dihydrogen-Bonded Sodium Borohydride Dihydrate NaBH4·2H2O, 2025, Inorganic Chemistry

Frequent collaborators of Kikegawa include:

  • Satoshi Nakano
  • Hiroshi Fujihisa
  • Hiroshi Yamawaki
  • Asami Sano-Furukawa
  • Takanori Hattori

Their body of work significantly engages with high-pressure experimental methodologies and theoretical analyses to explore molecular interactions and phase behavior under extreme conditions. The focus on materials related to ammonia borane and borohydrides reflects a sustained interest in hydrogen storage materials and their physicochemical properties.

Overall, Takumi Kikegawa's research contributes to advancing understanding in the interplay between pressure, structure, and bonding in complex chemical systems relevant to both fundamental science and practical applications in energy materials.

Best Publications

  • High-pressure in situ x-ray-diffraction study of the phase transformation from graphite to hexagonal diamond at room temperature.

    Takehiko Yagi;Wataru Utsumi;Masa-aki Yamakata;Takumi Kikegawa

  • Baddeleyite-Type High-Pressure Phase of TiO2.

    H. Sato;S. Endo;M. Sugiyama;T. Kikegawa

  • The Phase Boundary Between α- and β-Mg2SiO4 Determined by in Situ X-ray Observation

    H. Morishima;Takumi Kato;M. Suto;E. Ohtani

  • Phase relations of CaCO3 at high pressure and high temperature

    Kaichi Suito;Junpei Namba;Takashi Horikawa;Yozo Taniguchi

  • A high-pressure and high-temperature synthesis of platinum carbide

    Shigeaki Ono;Takumi Kikegawa;Yasuo Ohishi

  • Application of an imaging plate to high‐pressure x‐ray study with a diamond anvil cell (invited)

    O. Shimomura;K. Takemura;H. Fujihisa;Y. Fujii

  • Phase relations and equations of state of ZrO 2 under high temperature and high pressure

    O. Ohtaka;H. Fukui;T. Kunisada;T. Fujisawa

  • Post-aragonite phase transformation in CaCO3 at 40 GPa

    Shigeaki Ono;Takumi Kikegawa;Yasuo Ohishi;Jun Tsuchiya

  • In situ determination of the phase boundary between Wadsleyite and Ringwoodite in Mg2SiO4

    Akio Suzuki;Eiji Ohtani;Hideaki Morishima;Tomoaki Kubo

  • High-pressure transition of CaCO3

    Shigeaki Ono;Shigeaki Ono;Takumi Kikegawa;Yasuo Ohishi

  • An in situ X ray diffraction study of the kinetics of the Ni2SiO4 olivine‐spinel transformation

    D. C. Rubie;Y. Tsuchida;T. Yagi;W. Utsumi

  • Aluminous hydrous mineral δ-AlOOH as a carrier of hydrogen into the core-mantle boundary

    Asami Sano;Asami Sano;Eiji Ohtani;Tadashi Kondo;Naohisa Hirao

  • Synthesis, Thermal Stability and Properties of ZnO2 Nanoparticles

    W. Chen;Y. H. Lu;M. Wang;L. Kroner

  • Measurements of x‐ray diffraction for liquid metals under high pressure

    Kazuhiko Tsuji;Kenichi Yaoita;Motoharu Imai;Osamu Shimomura

  • Evidence for molecular dissociation in bromine near 80 GPa.

    Y. Fujii;K. Hase;Y. Ohishi;H. Fujihisa

  • Thermal expansivity of MgSiO3 perovskite under high pressures up to 20 GPa

    Wataru Utsumi;Nobumasa Funamori;Takehiko Yagi;Eiji Ito

  • High-pressure phase transition of hematite, Fe2O3

    Shigeaki Ono;Takumi Kikegawa;Yasuo Ohishi

  • Plagioclase breakdown as an indicator for shock conditions of meteorites

    Tomoaki Kubo;Makoto Kimura;Takumi Kato;Masayuki Nishi

  • Exploratory studies of silicate melt structure at high pressures and temperatures by in situ X‐ray diffraction

    Nobumasa Funamori;Shino Yamamoto;Takehiko Yagi;Takumi Kikegawa

  • Fe‐Mg partitioning between (Mg, Fe)SiO3 post‐perovskite, perovskite, and magnesiowüstite in the Earth's lower mantle

    Yusuke Kobayashi;Tadashi Kondo;Eiji Ohtani;Naohisa Hirao

  • Phase transitions of (Mg,Fe)O at megabar pressures

    Tadashi Kondo;Eiji Ohtani;Naohisa Hirao;Takehiko Yagi

Frequent Co-Authors

Eiji Ohtani
Eiji Ohtani Tohoku University
Takehiko Yagi
Takehiko Yagi University of Tokyo
Shigeaki Ono
Shigeaki Ono Japan Agency for Marine-Earth Science and Technology
Osamu Shimomura
Osamu Shimomura Marine Biological Laboratory
Akio Suzuki
Akio Suzuki Tohoku University
Ken-ichi Funakoshi
Ken-ichi Funakoshi Comprehensive Research Organization for Science and Society
Toru Inoue
Toru Inoue Hiroshima University
Tetsuo Irifune
Tetsuo Irifune Ehime University
Yasuhiko Syono
Yasuhiko Syono Tohoku University
Nagayoshi Sata
Nagayoshi Sata Japan Agency for Marine-Earth Science and Technology

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