World's Best Scientists 2026 revealed!

D-Index & Metrics

Materials Science

D-Index
59
Citations
11200
World Ranking
7444
National Ranking
405

Kiyoshi Hirao 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 Kiyoshi Hirao sits on this spectrum.

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 publications 1,163+

This scientist: 367 publications — 73rd percentile

73% of scientists in this discipline score the same or lower.

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

Kiyoshi Hirao 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 Kiyoshi Hirao sits on this spectrum.

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 D-Index 165+

This scientist: 59 D-Index — 44th percentile

44% of scientists in this discipline score the same or lower.

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

Overview

Kiyoshi Hirao is affiliated with the National Institute of Advanced Industrial Science and Technology in Japan. Their research spans materials science and engineering, with a focus on ceramics and composites, electrical and electronic engineering, and materials chemistry among other subfields.

The main fields of study for Hirao include:

  • Materials Science
  • Engineering

Subfields of particular interest in Hirao's work are:

  • Electrical and Electronic Engineering
  • Materials Chemistry
  • Ceramics and Composites
  • Mechanical Engineering
  • Mechanics of Materials

Key topics covered by Hirao's research include:

  • Advanced ceramic materials synthesis
  • Semiconductor materials and devices
  • Thermal properties of materials
  • MXene and MAX Phase Materials
  • Metal and Thin Film Mechanics
  • Ferroelectric and Piezoelectric Materials
  • Silicon Carbide Semiconductor Technologies

Hirao has published extensively on advanced ceramics and related materials. Notable recent papers by Hirao and collaborators are:

  • "Improving the thermal conductivity of epoxy composites using a combustion-synthesized aggregated β-Si3N4 filler with randomly oriented grains" (2020, Scientific Reports)
  • "Effect of microstructures on dielectric breakdown strength of sintered reaction-bonded silicon nitride ceramics" (2022, Journal of the American Ceramic Society)
  • "Artificial Intelligence-based determination of fracture toughness and bending strength of silicon nitride ceramics" (2023, Journal of the American Ceramic Society)
  • "Thickness dependence of dielectric breakdown strength for silicon nitride substrate" (2021, Journal of the Ceramic Society of Japan)
  • "Effects of nitridation temperature on properties of sintered reaction-bonded silicon nitride" (2022, International Journal of Applied Ceramic Technology)

The most frequent venues for Hirao's publications include:

  • Journal of the American Ceramic Society
  • Ceramics International
  • International Journal of Applied Ceramic Technology
  • Journal of the Ceramic Society of Japan
  • Scientific Reports

Collaborative work has often involved:

  • Manabu Fukushima
  • Yuki Nakashima
  • You Zhou
  • Tatsuki Ohji
  • Norimitsu Murayama

Overall, Hirao's research contributes to the understanding and development of ceramic materials, focusing on their synthesis, structural properties, and applications in electronics and thermal management technologies.

Best Publications

  • Microstructural Design of Silicon Nitride with Improved Fracture Toughness: I, Effects of Grain Shape and Size

    Paul F. Becher;Ellen Y. Sun;Kevin P. Plucknett;Kathleen B. Alexander

  • Microstructural design of silicon nitride with improved fracture toughness: II. Effects of yttria and alumina additives

    Ellen Y. Sun;Paul F. Becher;Kevin P. Plucknett;Chun-Hway Hsueh

  • Processing Strategy for Producing Highly Anisotropic Silicon Nitride

    Kiyoshi Hirao;Masayoshi Ohashi;Manuel E. Brito;Shuzo Kanzaki

  • A Tough Silicon Nitride Ceramic with High Thermal Conductivity

    You Zhou;Hideki Hyuga;Dai Kusano;Yu-ichi Yoshizawa

  • Microstructure Control of Silicon Nitride by Seeding with Rodlike β‐Silicon Nitride Particles

    Kiyoshi Hirao;Takaaki Nagaoka;Manuel E. Brito;Shuzo Kanzaki

  • Thermal Conductivity of β‐Si3N4: II, Effect of Lattice Oxygen

    Mikito Kitayama;Kiyoshi Hirao;Akira Tsuge;Koji Watari

  • High strength B4C–TiB2 composites fabricated by reaction hot-pressing

    Suzuya Yamada;Kiyoshi Hirao;Yukihiko Yamauchi;Shuzo Kanzaki

  • Thermal Conductivity of ß-Si3N4: I, Effects of Various Microstructural Factors

    Mikito Kitayama;Kiyoshi Hirao;Motohiro Toriyama;Shuzo Kanzaki

  • MgSiN2 Addition as a Means of Increasing the Thermal Conductivity of β‐Silicon Nitride

    Hiroyuki Hayashi;Kiyoshi Hirao;Motohiro Toriyama;Shuzo Kanzaki

  • Microstructure designing of silicon nitride

    Shuzo Kanzaki;Manuel E. Brito;M.Cecilia Valecillos;Kiyoshi Hirao

  • Densification and grain growth in pulse electric current sintering of alumina

    You Zhou;Kiyoshi Hirao;Yukihiko Yamauchi;Shuzo Kanzaki

  • High Thermal Conductivity in Silicon Nitride with Anisotropie Microstructure

    Kiyoshi Hirao;Koji Watari;Manuel E. Brito;Motohiro Toriyama

  • Microstructural Characterization of Porous Silicon Carbide Membrane Support With and Without Alumina Additive

    Manabu Fukushima;You Zhou;Hiroyuki Miyazaki;Yu-ichi Yoshizawa

  • Development of high-thermal-conductivity silicon nitride ceramics

    You Zhou;Hideki Hyuga;Dai Kusano;Yu-ichi Yoshizawa

  • Thermal Conductivity of β‐Si3N4: III, Effect of Rare‐Earth (RE = La, Nd, Gd, Y, Yb, and Sc) Oxide Additives

    Mikito Kitayama;Kiyoshi Hirao;Koji Watari;Motohiro Toriyama

  • High Thermal Conductivity Silicon Nitride Ceramic

    Kiyoshi Hirao;Koji Watari;Hiroyuki Hayashi;Mikito Kitayama

  • Thermal conductivity of silicon carbide densified with rare-earth oxide additives

    You Zhou;Kiyoshi Hirao;Koji Watari;Yukihiko Yamauchi

  • Tribological behavior of ceramic materials (Si3N4, SiC and Al2O3) in aqueous medium

    D. Amutha Rani;Y. Yoshizawa;H. Hyuga;K. Hirao

  • Processing and Thermal Conductivity of Sintered Reaction-Bonded Silicon Nitride. I: Effect of Si Powder Characteristics

    Xinwen Zhu;You Zhou;Kiyoshi Hirao;Zoltán Lenčéš

  • Formation and Properties of Ln‐Si‐O‐N Glasses (Ln = Lanthanides or Y)

    Masayoshi Ohashi;Kazuo Nakamura;Kiyoshi Hirao;Shuzo Kanzaki

  • Fracture Resistance Behavior of Highly Anisotropic Silicon Nitride

    Tatsuki Ohji;Kiyoshi Hirao;Shuzo Kanzaki

  • High-Strength and High-Fracture-Toughness Ceramics in the Al2O3/LaAl11O18 Systems

    Masaki Yasuoka;Kiyoshi Hirao;Manuel E. Brito;Shuzo Kanzaki

Frequent Co-Authors

Tatsuki Ohji
Tatsuki Ohji National Institute of Advanced Industrial Science and Technology
Yoshio Sakka
Yoshio Sakka National Institute for Materials Science
Michael J. Hoffmann
Michael J. Hoffmann Karlsruhe Institute of Technology
Katsuaki Suganuma
Katsuaki Suganuma Osaka University
Woosuck Shin
Woosuck Shin National Institute of Advanced Industrial Science and Technology
Shijo Nagao
Shijo Nagao Osaka University
Seung-Boo Jung
Seung-Boo Jung Sungkyunkwan University
Setsuhisa Tanabe
Setsuhisa Tanabe Kyoto University
Zhijian Shen
Zhijian Shen Stockholm University
Naohiro Soga
Naohiro Soga Kyoto University

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