The bibliometric data utilized to devise citation-based metrics for this ranking were collected as of January 12, 2026. The ranking methodology centers on the D-index (Discipline H-index), a refined metric that quantifies a researcher's impact specifically within the discipline under examination—in this case, Materials Science. By focusing solely on discipline-specific papers and their citation metrics, the D-index provides a targeted and precise assessment of expertise and influence within the field.
Scope of Research and Ranking Criteria
A total of 279,971 scientist profiles aggregated from a diverse range of bibliometric data sources were analyzed across all scientific disciplines. From this dataset, 2 scientists specializing in Materials Science in Iraq were identified and evaluated.
To qualify for inclusion in the Materials Science ranking, each scientist was required to meet a minimum D-index threshold of 40. Additionally, the majority of their tier publications needed to be within the Materials Science domain, ensuring focused expertise. Recognized awards and achievements in the field of Materials Science were also considered as supplementary indicators of scholarly contribution.
The D-index threshold adapts dynamically, increasing in increments of 10 relative to the total number of scholars estimated per discipline to consistently include the top 1% of leading researchers. Furthermore, to maintain discipline specificity, a proximity criterion was enforced whereby the difference between a scientist's general H-index and their discipline-specific D-index must not exceed 30%.
Verification and Validation Practices
Recognizing the inherent limitations of raw bibliometric data for absolute assessment, the Research.com team implemented rigorous manual verification protocols. All scientist profiles were carefully reviewed and cross-correlated against publications in a broad spectrum of trustworthy sources to ensure accuracy and validity.
While factors such as the number of publications in prominent journals and conference proceedings do not directly influence the researcher’s position in the ranking, they are acknowledged as valuable secondary signals reflecting a scientist’s contribution to Materials Science research.
Ultimately, ranking positions are established through the D-index derived from data obtained from OpenAlex and CrossRef—two of the most prominent, openly accessible bibliometric databases available to the scholarly community worldwide. For a detailed explanation of the methodology, readers are encouraged to visit our methodology page.
Research.com’s Commitment and Mission
At Research.com, our mission is to motivate researchers, corporations, and policymakers globally to stay informed about the trajectories and impact of leading experts in various scientific domains. By providing transparent, credible, and meticulously developed rankings, we aim to facilitate the scientific community's ability to identify top specialists within specific fields, countries, and research institutions.
Through this work, we strive to promote informed decision-making in research partnerships, funding allocations, and academic collaborations, thereby fostering a more connected and knowledge-driven global scientific community.
