World's Best Scientists 2026 revealed!
Roger A. De Souza

Roger A. De Souza

D-Index & Metrics

Materials Science

D-Index
49
Citations
7889
World Ranking
10614
National Ranking
591

Roger A. De Souza 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 Roger A. De Souza 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: 163 publications — 18th percentile

18% of scientists in this discipline score the same or lower.

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

Roger A. De Souza 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 Roger A. De Souza 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: 49 D-Index — 19th percentile

19% of scientists in this discipline score the same or lower.

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

Overview

Roger A. De Souza is affiliated with RWTH Aachen University in Germany, specializing in materials science and engineering. Their research focuses on electronic and structural properties of oxides, with significant contributions to solid oxide fuel cells, perovskite materials, and oxide electroceramics.

The scientist has published extensively, with a primary emphasis on materials chemistry and electrical and electronic engineering fields. They have contributed notably to the following subfields:

  • Materials Chemistry
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanical Engineering

Roger A. De Souza's research covers key topics such as:

  • Electronic and Structural Properties of Oxides
  • Advancements in Solid Oxide Fuel Cells
  • Magnetic and transport properties of perovskites and related materials
  • Ferroelectric and Piezoelectric Materials
  • Advanced Memory and Neural Computing
  • Semiconductor materials and devices
  • Catalytic Processes in Materials Science

Among recent publications featuring their work are:

  • Transport properties of dislocations in SrTiO3 and other perovskites, 2021, Current Opinion in Solid State and Materials Science
  • Electric-field-assisted processing of ceramics: Nonthermal effects and related mechanisms, 2021, MRS Bulletin
  • The Fermi energy as common parameter to describe charge compensation mechanisms: A path to Fermi level engineering of oxide electroceramics, 2023, Journal of Electroceramics
  • Grain-boundary diffusion of cations in fluorite-type oxides is faster but not always easier, 2020, Acta Materialia
  • The surprisingly high activation barrier for oxygen-vacancy migration in oxygen-excess manganite perovskites, 2020, Physical Chemistry Chemical Physics

De Souza has collaborated frequently with peers including Joe Kler, Dennis Kemp, Alexander Bonkowski, Jana P. Parras, and Adrian L. Usler.

Their work appears regularly in several publication venues, with multiple contributions to:

  • Physical Chemistry Chemical Physics
  • Journal of Materials Chemistry A
  • Advanced Functional Materials
  • Physical Review Materials
  • ChemElectroChem

This profile reflects a research career with a strong interdisciplinary approach centered on materials chemistry and engineering, emphasizing oxide materials and their electronic and transport properties.

Best Publications

  • A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3

    Ming Li;Martha J. Pietrowski;Roger A. De Souza;Huairuo Zhang

  • The formation of equilibrium space-charge zones at grain boundaries in the perovskite oxide SrTiO3

    Roger A. De Souza

  • Behavior of oxygen vacancies in single-crystal SrTiO 3 : Equilibrium distribution and diffusion kinetics

    Roger A. De Souza;Veronika Metlenko;Daesung Park;Thomas E. Weirich

  • A kinetic study of the decomposition of the cubic perovskite-type oxide BaxSr1−xCo0.8Fe0.2O3−δ (BSCF) (x = 0.1 and 0.5)

    David N. Mueller;Roger A. De Souza;Thomas E. Weirich;Daniel Roehrens

  • Oxygen diffusion in nanocrystalline yttria-stabilized zirconia: the effect of grain boundaries

    Roger A. De Souza;Martha J. Pietrowski;Umberto Anselmi-Tamburini;Sangtae Kim

  • A chemically driven insulator-metal transition in non-stoichiometric and amorphous gallium oxide.

    Lakshmi Nagarajan;Roger A. De Souza;Dominik Samuelis;Ilia Valov

  • Formation and migration of cation defects in the perovskite oxide LaMnO3

    Roger A. De Souza;M. Saiful Islam;Ellen Ivers-Tiffée

  • Do dislocations act as atomic autobahns for oxygen in the perovskite oxide SrTiO3

    Veronika Metlenko;Amr H. H. Ramadan;Felix Gunkel;Hongchu Du

  • Modifying the barriers for oxygen-vacancy migration in fluorite-structured CeO2 electrolytes through strain: a computer simulation study

    Roger A. De Souza;Amr Ramadan;Stefanie Hörner

  • Oxygen Diffusion in SrTiO3 and Related Perovskite Oxides

    Unknown

  • On the conduction pathway for protons in nanocrystalline yttria-stabilized zirconia.

    Sangtae Kim;Hugo J. Avila-Paredes;Shizhong Wang;Chien-Ting Chen

  • Spectromicroscopic insights for rational design of redox-based memristive devices

    Christoph Baeumer;Christoph Schmitz;Amr H.H. Ramadan;Hongchu Du;Hongchu Du

  • Electrical and structural characterization of a low-angle tilt grain boundary in iron-doped strontium titanate

    Roger A. De Souza;Jürgen Fleig;Joachim Maier;Oliver Kienzle

  • The thermodynamics and kinetics of iodine vacancies in the hybrid perovskite methylammonium lead iodide

    Denis Barboni;Roger A. De Souza

  • Phase Stability and Oxygen Nonstoichiometry of Highly Oxygen-Deficient Perovskite-Type Oxides: A Case Study of (Ba,Sr)(Co,Fe)O3−δ

    David N. Mueller;Roger A. De Souza;Han-Ill Yoo;Manfred Martin;Manfred Martin

  • A generalised space-charge theory for extended defects in oxygen-ion conducting electrolytes: from dilute to concentrated solid solutions

    David S. Mebane;Roger A. De Souza

  • Using 18O/16O exchange to probe an equilibrium space-charge layer at the surface of a crystalline oxide: method and application

    Roger A. De Souza;Manfred Martin

  • Computational Study of Oxygen Diffusion along a[100] Dislocations in the Perovskite Oxide SrTiO3

    Stephan P. Waldow;Roger A. De Souza

  • Probing Diffusion Kinetics with Secondary Ion Mass Spectrometry

    Roger A. De Souza;Manfred Martin

  • Electrical resistance of low-angle tilt grain boundaries in acceptor-doped SrTiO3 as a function of misorientation angle

    Roger A. De Souza;Jürgen Fleig;Joachim Maier;Zaoli Zhang

  • SrTiO3: a model electroceramic

    Roger A. De Souza;Jürgen Fleig;Rotraut Merkle;Joachim Maier

  • A universal empirical expression for the isotope surface exchange coefficients (k*) of acceptor-doped perovskite and fluorite oxides.

    Unknown

Frequent Co-Authors

Manfred Martin
Manfred Martin RWTH Aachen University
Rainer Waser
Rainer Waser RWTH Aachen University
Zuhair A. Munir
Zuhair A. Munir University of California, Davis
Regina Dittmann
Regina Dittmann Forschungszentrum Jülich
Joachim Mayer
Joachim Mayer RWTH Aachen University
Joachim Maier
Joachim Maier Max Planck Society
Ilia Valov
Ilia Valov RWTH Aachen University
Wilfried Sigle
Wilfried Sigle Max Planck Society
Rotraut Merkle
Rotraut Merkle Max Planck Society

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