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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 60 6963 6727 374 361 271 15307

Reiji Kumai publications per year

The chart shows the history of publications by Reiji Kumai between 1992 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Reiji Kumai published across 34 years, from 1992 to 2025, averaging 9.8 papers a year. Output peaked at 42 publications in 2022. 19 of the 333 publications appeared in the last two years.

No. of publications
10 20 30 40
Bar chart. Horizontal axis: year, 1992 to 2025. Vertical axis: number of publications, 0 to 42. Peak 42 publications in 2022. 1992: 1 publication 1993: 1 publication 1994: 3 publications 1995: 1 publication 1996: 6 publications 1997: 5 publications 1998: 4 publications 1999: 7 publications 2000: 5 publications 2001: 5 publications 2002: 1 publication 2003: 5 publications 2004: 5 publications 2005: 6 publications 2006: 8 publications 2007: 8 publications 2008: 6 publications 2009: 9 publications 2010: 9 publications 2011: 12 publications 2012: 11 publications 2013: 11 publications 2014: 29 publications 2015: 13 publications 2016: 15 publications 2017: 21 publications 2018: 14 publications 2019: 15 publications 2020: 9 publications 2021: 15 publications 2022: 42 publications 2023: 12 publications 2024: 9 publications 2025: 10 publications
1992 2025

333 publications in total across all disciplines

View publications per year as a table
Reiji Kumai: publications per year, 1992 to 2025
Year Publications
1992 1
1993 1
1994 3
1995 1
1996 6
1997 5
1998 4
1999 7
2000 5
2001 5
2002 1
2003 5
2004 5
2005 6
2006 8
2007 8
2008 6
2009 9
2010 9
2011 12
2012 11
2013 11
2014 29
2015 13
2016 15
2017 21
2018 14
2019 15
2020 9
2021 15
2022 42
2023 12
2024 9
2025 10
Total 333
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Reiji Kumai 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 Reiji Kumai 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, 270–289 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: 271 publications — 53rd percentile

53% 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
270–289 665 271
290–309 593
310–329 537
330–349 477
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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Reiji Kumai 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 Reiji Kumai 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, 60–61 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: 60 D-Index — 46th percentile

46% 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
58–59 610
60–61 587 60
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

Reiji Kumai is affiliated with the High Energy Accelerator Research Organization in Japan and specializes in the field of materials science. Their research focuses primarily on materials chemistry, with notable emphasis on electronic, optical, and magnetic materials, as well as polymers, plastics, and organic chemistry.

Their work covers several main topics, including:

  • Crystallization and Solubility Studies
  • X-ray Diffraction in Crystallography
  • Conducting Polymers and Applications
  • Organic Electronics and Photovoltaics
  • Perovskite Materials and Applications
  • Liquid Crystal Research Advancements
  • Crystallography and Molecular Interactions

Reiji Kumai has contributed to key scientific journals, frequently publishing in:

  • The Cambridge Structural Database
  • Journal of Materials Chemistry C
  • Chemical Science
  • Physical Review Materials
  • Journal of the Physical Society of Japan

Their recent papers include:

  • High-pressure phase diagrams of FeSe1−xTex: correlation between suppressed nematicity and enhanced superconductivity, 2021, Nature Communications
  • Emerging Disordered Layered-Herringbone Phase in Organic Semiconductors Unveiled by Electron Crystallography, 2021, Chemistry of Materials
  • Regioisomeric control of layered crystallinity in solution-processable organic semiconductors, 2020, Chemical Science
  • q=0 long-range magnetic order in centennialite CaCu3(OD)6Cl2·0.6D2O: A spin-½ perfect kagome antiferromagnet with J1−J2−Jd, 2020, Physical Review B
  • Effect of Alkyl Chain Length on Charge Transport Property of Anthracene-Based Organic Semiconductors, 2020, ACS Applied Materials & Interfaces

Reiji Kumai has collaborated extensively with several co-authors, including:

  • Seiji Tsuzuki
  • Tatsuo Hasegawa
  • Shunto Arai
  • Toshiki Higashino
  • Satoru Inoue

Their body of work demonstrates a strong engagement with structural databases and advanced crystallographic techniques applied to functional materials. This includes studies on organic semiconductors, magnetic materials, and superconductors, reflecting a multidisciplinary approach within materials chemistry and engineering fields.

Best Publications

  • Inkjet printing of single-crystal films

    Hiromi Minemawari;Toshikazu Yamada;Hiroyuki Matsui;Jun’ya Tsutsumi

  • Giant Rashba-type spin splitting in bulk BiTeI

    K. Ishizaka;Mohammad Saeed Bahramy;H. Murakawa;M. Sakano

  • Above-room-temperature ferroelectricity in a single-component molecular crystal

    Sachio Horiuchi;Yusuke Tokunaga;Gianluca Giovannetti;Silvia Picozzi

  • Magnetic and electronic properties of a single crystal of ordered double perovskite Sr 2 FeMoO 6

    Y. Tomioka;T. Okuda;Y. Okimoto;R. Kumai

  • Ferroelectricity and polarity control in solid-state flip-flop supramolecular rotators.

    Tomoyuki Akutagawa;Hiroyuki Koshinaka;Daisuke Sato;Sadamu Takeda

  • Ferroelectricity near room temperature in co-crystals of nonpolar organic molecules

    Sachio Horiuchi;Fumiyuki Ishii;Reiji Kumai;Yoichi Okimoto

  • Structural and magnetoelectric properties of Ga 2 − x Fe x O 3 single crystals grown by a floating-zone method

    T. Arima;T. Arima;D. Higashiyama;Y. Kaneko;J. P. He

  • Three-way switching in a cyanide-bridged [CoFe] chain

    Norihisa Hoshino;Fumichika Iijima;Graham N. Newton;Norifumi Yoshida

  • Diffuse Phase Transition and Phase Separation in Cr-Doped Nd 1/2 Ca 1/2 MnO 3 : A Relaxor Ferromagnet

    T. Kimura;Y. Tomioka;R. Kumai;Y. Okimoto

  • Above-room-temperature ferroelectricity and antiferroelectricity in benzimidazoles

    Sachio Horiuchi;Fumitaka Kagawa;Kensuke Hatahara;Kensuke Kobayashi

  • Electronic Ferroelectricity in a Molecular Crystal with Large Polarization Directing Antiparallel to Ionic Displacement

    Kensuke Kobayashi;Sachio Horiuchi;Reiji Kumai;Reiji Kumai;Fumitaka Kagawa

  • Room-temperature ferroelectricity and gigantic dielectric susceptibility on a supramolecular architecture of phenazine and deuterated chloranilic acid.

    Sachio Horiuchi;Reiji Kumai;Yoshinori Tokura

  • Programmable spin-state switching in a mixed-valence spin-crossover iron grid

    Takuto Matsumoto;Graham N. Newton;Takuya Shiga;Shinya Hayami

  • Striction-Coupled Magnetoresistance in Perovskite-Type Manganese Oxides

    H. Kuwahara;Y. Tomioka;Y. Moritomo;A. Asamitsu

  • Effects of Substituted Alkyl Chain Length on Solution-Processable Layered Organic Semiconductor Crystals

    Satoru Inoue;Hiromi Minemawari;Jun’ya Tsutsumi;Masayuki Chikamatsu

  • Hydrogen-bonding molecular chains for high-temperature ferroelectricity.

    Sachio Horiuchi;Reiji Kumai;Yoshinori Tokura

  • Hydrogen-Bond-Dynamics-Based Switching of Conductivity and Magnetism: A Phase Transition Caused by Deuterium and Electron Transfer in a Hydrogen-Bonded Purely Organic Conductor Crystal

    Akira Ueda;Shota Yamada;Shota Yamada;Takayuki Isono;Hiromichi Kamo

  • A Supramolecular Ferroelectric Realized by Collective Proton Transfer

    Sachio Horiuchi;Reiji Kumai;Yoshinori Tokura;Yoshinori Tokura

  • Magnetostructural phase transitions in La1-xSrxMnO3 with controlled carrier density.

    A Asamitsu;Y Moritomo;R Kumai;Y Tomioka

  • Hydrogen bond-promoted metallic state in a purely organic single-component conductor under pressure

    Takayuki Isono;Hiromichi Kamo;Akira Ueda;Kazuyuki Takahashi

  • Erratum: Above-room-temperature ferroelectricity in a single-component molecular crystal (Nature (2010) 463 (789-792))

    Sachio Horiuchi;Yusuke Tokunaga;Gianluca Giovannetti;Silvia Picozzi

Frequent Co-Authors

Yoshinori Tokura
Yoshinori Tokura University of Tokyo
Sachio Horiuchi
Sachio Horiuchi National Institute of Advanced Industrial Science and Technology
Tatsuo Hasegawa
Tatsuo Hasegawa University of Tokyo
Taka-hisa Arima
Taka-hisa Arima University of Tokyo
Yoichi Okimoto
Yoichi Okimoto Tokyo Institute of Technology
Yasuhiro Tokura
Yasuhiro Tokura University of Tsukuba
Y. Tomioka
Y. Tomioka National Institute of Advanced Industrial Science and Technology
Masashi Kawasaki
Masashi Kawasaki University of Tokyo
Ichiro Terasaki
Ichiro Terasaki Nagoya University
Hiroki Oshio
Hiroki Oshio Dalian University of Technology

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