A scientist’s position in the ranking is determined by their D-index (Discipline H-index), a metric that considers only publications and citations within the specific discipline under examination—in this case, Materials Science. This approach ensures that the ranking reflects domain-relevant impact rather than general scholarly activity.
Scope of Research and Ranking Criteria
The ranking's scope involved a thorough examination of 279,971 scientist profiles identified from an array of bibliometric data sources across all scientific disciplines. Within the Materials Science discipline, 65 scientists were carefully assessed for inclusion.
To qualify for this ranking, a scientist's D-index had to be at least 40, reflecting a high level of scholarly impact within Materials Science. Furthermore, the majority of their top-tier publications were required to be firmly rooted in this discipline. In addition to quantitative metrics, researchers’ awards and notable achievements in the field of Materials Science were also factored into the evaluation process.
The threshold for the D-index is adjusted in increments of 10 depending on the estimated total number of scholars within each discipline, guaranteeing inclusion of approximately the top 1% of leading experts. Additionally, a proximity criterion was applied requiring a maximum difference of 30% or less between a scientist’s overall H-index and their D-index, ensuring a strong alignment between their general and discipline-specific impact.
Verification and Validation Practices
Recognizing that raw bibliometric data alone can never offer a fully conclusive measure of scholarly output, meticulous manual verification was conducted on all eligible scientist profiles. This process included cross-correlation with publications indexed in a wide range of trustworthy academic sources to authenticate the accuracy and relevance of each profile's data.
While the number of papers published in prominent journals and conference proceedings does not directly influence a researcher’s position on the Research.com ranking, it is regarded as a valuable secondary indicator of a scientist’s contribution to their specific research area.
The ranking positions themselves are firmly based on each researcher’s D-index, derived from comprehensive data gathered via OpenAlex and CrossRef — two of the most prominent and respected bibliometric databases accessible to the global research community.
For detailed insights into the methodology underpinning this ranking, readers are encouraged to visit our methodology page.
Research.com’s Mission and Agenda
The primary mission behind the creation of this ranking is to motivate researchers, companies, and policymakers worldwide to closely observe the trajectories of leading experts within their fields. By providing a transparent, carefully validated overview of top scientists, Research.com aims to facilitate a deeper understanding of scholarly leadership in specific areas of study, across countries, and within research institutions.
Through this initiative, we strive to offer the broader scientific community a reliable resource to identify and engage with the foremost authorities in Materials Science in Portugal, thereby fostering collaboration, innovation, and informed decision-making within academia and beyond.
