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Lattice-to-Total Thermal Conductivity Ratio: A Phonon-Glass Electron-Crystal Descriptor for Data-Driven Thermoelectric Design
Yifan Sun, Z · 2026-04-28 · via cs.LG updates on arXiv.org

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Abstract:Thermoelectrics (TEs) are promising candidates for energy harvesting with performance quantified by figure of merit, $ZT$. To accelerate the discovery of high-$ZT$ materials, efforts have focused on identifying compounds with low thermal conductivity $\kappa$. Using a curated dataset of 71,913 entries, we show that high-$ZT$ materials reside not only in the low-$\kappa$ regime but also cluster near a lattice-to-total thermal conductivity ratio ($\kappa_\mathrm{L}/\kappa$) of approximately 0.5. This optimal ratio provides a quantitative descriptor for the well-known phonon-glass electron-crystal (PGEC) design concept. Building on this insight, we construct a framework consisting of two machine learning models for the lattice and electronic components of thermal conductivity that jointly provide both $\kappa$ and $\kappa_\mathrm{L}/\kappa$ for screening and guiding the optimization of TE materials. By applying this framework to 104,567 inorganic compounds, we identify 2,522 ultralow-$\kappa$ candidates while simultaneously evaluating their proximity to the optimal PGEC regime. A follow-up case study on chemical doping demonstrates how the framework can qualitatively provide optimization strategies that shift pristine materials toward the ideal $\kappa_\mathrm{L}/\kappa$ $\approx$ 0.5 target. Ultimately, by integrating rapid screening with PGEC-guided optimization, our data-driven framework takes a critical step towards closing the gap between materials discovery and performance enhancement.
Comments: 16 pages, 6 figures
Subjects: Materials Science (cond-mat.mtrl-sci); Machine Learning (cs.LG)
Cite as: arXiv:2511.21213 [cond-mat.mtrl-sci]
  (or arXiv:2511.21213v2 [cond-mat.mtrl-sci] for this version)
  https://doi.org/10.48550/arXiv.2511.21213

arXiv-issued DOI via DataCite

Submission history

From: Yifan Sun [view email]
[v1] Wed, 26 Nov 2025 09:44:10 UTC (6,983 KB)
[v2] Sat, 25 Apr 2026 02:40:48 UTC (4,995 KB)

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