World's Best Scientists 2026 revealed!
Georges Calas

Georges Calas

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Chemistry
France
2025

D-Index & Metrics

Materials Science

D-Index
73
Citations
15595
World Ranking
3919
National Ranking
86

Chemistry

D-Index
77
Citations
17066
World Ranking
4132
National Ranking
122

Georges Calas 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 Georges Calas 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: 303 publications — 61st percentile

61% of scientists in this discipline score the same or lower.

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

Georges Calas 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 Georges Calas 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: 73 D-Index — 71st percentile

71% of scientists in this discipline score the same or lower.

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

Research.com Recognitions

  • 2025 - Research.com Chemistry in France Leader Award
  • 2022 - Research.com Chemistry in France Leader Award
  • 2014 - Fellow of the Royal Society of Canada Academy of Science
  • 2011 - Member of Academia Europaea

Overview

Georges Calas is affiliated with Sorbonne University in France and has established a research profile centered on Earth and Planetary Sciences as well as Materials Science. Their work spans various subfields such as Materials Chemistry, Geophysics, Geochemistry and Petrology, Ceramics and Composites, and Inorganic Chemistry.

The scientist's research covers several main topics including:

  • Geological and Geochemical Analysis
  • Glass properties and applications
  • Radioactive element chemistry and processing
  • X-ray Diffraction in Crystallography
  • Mineralogy and Gemology Studies
  • Cultural Heritage Materials Analysis
  • Building materials and conservation

Recent scholarly publications reflect a range of interests, demonstrating a focus on both materials characterization and archaeological science. Some notable papers include:

  • "Thirteenth-century stained glass windows of the Sainte-Chapelle in Paris: An insight into medieval glazing work practices," 2021, Journal of Archaeological Science Reports
  • "Structural role of titanium on slag properties," 2020, Journal of the American Ceramic Society
  • "The representation of skin colour in medieval stained glasses: The role of manganese," 2021, Journal of Archaeological Science Reports
  • "Multiscale processes controlling niobium mobility during supergene weathering," 2023, Geochimica et Cosmochimica Acta
  • "Spectroscopic properties of alkali borate glasses containing Cu2+," 2022, Journal of Non-Crystalline Solids

Georges Calas has published frequently in several scientific venues. The most common publication journals and platforms include:

  • Zenodo (CERN European Organization for Nuclear Research)
  • Journal of Non-Crystalline Solids
  • American Mineralogist
  • Journal of Archaeological Science Reports
  • Journal of the American Ceramic Society

The scientist collaborates regularly with colleagues such as Laurence Galoisy, Mathieu Chassé, Quentin Bollaert, Cécile Quantin, and Delphine Vantelon, demonstrating ongoing partnerships across multiple projects.

Recognition for their contributions includes being named a Fellow of the Royal Society of Canada (2014) and becoming a Member of Academia Europaea (2011).

Best Publications

  • EXAFS analysis of arsenite adsorption onto two-line ferrihydrite, hematite, goethite, and lepidocrocite.

    Georges Ona-Nguema;Guillaume Morin;Farid Juillot;Georges Calas

  • Pressure-induced coordination changes in crystalline and vitreous GeO2.

    J. P. Itie;J. P. Itie;A. Polian;A. Polian;G. Calas;G. Calas;J. Petiau;J. Petiau

  • X-ray absorption spectroscopy; applications in mineralogy and geochemistry

    Gordon E. Brown;Georges Calas;Glenn A. Waychunas;Jacqueline Petiau

  • X-ray scattering and X-ray spectroscopy studies of silicate melts

    G. E. Brown;F. Farges;G. Calas

  • First-principles modeling of the infrared spectrum of kaolinite

    Etienne Balan;A. Marco Saitta;Francesco Mauri;Georges Calas

  • Coordination of iron in oxide glasses through high-resolution K-edge spectra: Information from the pre-edge

    G. Calas;J. Petiau

  • Trace element distribution coefficients in alkaline series

    Fabienne Lemarchand;Benoît Villemant;Georges Calas

  • XAFS determination of the chemical form of lead in smelter-contaminated soils and mine tailings; importance of adsorption processes

    Guillaume Morin;John D. Ostergren;Farid Juillot;Philippe Ildefonse

  • Bacterial formation of tooeleite and mixed arsenic(III) or arsenic(V)-iron(III) gels in the Carnoulès acid mine drainage, France. A XANES, XRD, and SEM study.

    Guillaume Morin;Farid Juillot;Corinne Casiot;Odile Bruneel

  • Formation of ferric oxides from aqueous solutions: A polyhedral approach by X-ray absorption spectroscdpy: I. Hydrolysis and formation of ferric gels

    J.M. Combes;A. Manceau;G. Calas;J.Y. Bottero

  • High-resolution XANES spectra of iron in minerals and glasses: structural information from the pre-edge region

    L Galoisy;G Calas;M.A Arrio

  • Arsenic in Soils, Mine Tailings, and Former Industrial Sites

    Guillaume Morin;Georges Calas

  • The effect of redox state on the local structural environment of iron in silicate glasses: A combined XAFS spectroscopy, molecular dynamics, and bond valence study

    François Farges;François Farges;Yannick Lefrère;Yannick Lefrère;Stéphanie Rossano;Anne Berthereau

  • X-ray-absorption near-edge structure of 3d transition elements in tetrahedral coordination: The effect of bond-length variation

    A. Bianconi;E. Fritsch;G. Calas;J. Petiau

  • Unraveling the atomic structure of biogenic silica: evidence of the structural association of Al and Si in diatom frustules

    M. Gehlen;L. Beck;G. Calas;A.-M. Flank

  • XANES Evidence for Rapid Arsenic(III) Oxidation at Magnetite and Ferrihydrite Surfaces by Dissolved O2 via Fe2+-Mediated Reactions

    Georges Ona-Nguema;Guillaume Morin;Yuheng Wang;Andrea L. Foster

  • Chemical dependence of network topology of calcium aluminosilicate glasses: a computer simulation study.

    Laurent Cormier;Dominique Ghaleb;Daniel R. Neuville;Jean-Marc Delaye

  • STRUCTURAL ENVIRONMENTS OF INCOMPATIBLE ELEMENTS IN SILICATE GLASS/MELT SYSTEMS. II: UIV, UV, AND UVI

    Franã§Ois Farges;Franã§Ois Farges;Carl W. Ponader;Georges Calas;Gordon E. Brown

  • Aluminium X-ray absorption Near Edge Structure in model compounds and Earth’s surface minerals

    P. Ildefonse;D. Cabaret;P. Sainctavit;G. Calas

  • Crystal chemistry of cobalt and nickel in lithiophorite and asbolane from New Caledonia

    A. Manceau;S. Llorca;G. Calas

Frequent Co-Authors

Gordon E. Brown
Gordon E. Brown Stanford University
Laurent Cormier
Laurent Cormier Sorbonne University
Guillaume Morin
Guillaume Morin Sorbonne University
Etienne Balan
Etienne Balan Sorbonne University
Farid Juillot
Farid Juillot Institut de Recherche pour le Développement
Thierry Allard
Thierry Allard Sorbonne University
Alain Manceau
Alain Manceau École Normale Supérieure de Lyon
Emmanuel Fritsch
Emmanuel Fritsch University of Nantes
François Farges
François Farges Centre national de la recherche scientifique, CNRS
Nicolas Menguy
Nicolas Menguy Sorbonne University

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