journal article·2017-02-01Open access

Understanding Phonon Scattering by Nanoprecipitates in Potassium-Doped Lead Chalcogenides

Zhao Wang, Xiaolong Yang, Dan Feng, Haijun Wu, Jesus Carrete, Li-Dong Zhao, Chao Li, Shaodong Cheng, Biaolin Peng, Guang Yang, Jiaqing He

Abstract

We present a comprehensive experimental and theoretical study of phonon scattering by nanoprecipitates in potassium-doped PbTe, PbSe, and PbS. We highlight the role of the precipitate size distribution measured by microscopy, whose tuning allows for thermal conductivities lower than the limit achievable with a single size. The correlation between the size distribution and the contributions to thermal conductivity from phonons in different frequency ranges provides a physical basis to the experimentally measured thermal conductivities, and a criterion to estimate the lowest achievable thermal conductivity. The results have clear implications for efficiency enhancements in nanostructured bulk thermoelectrics.
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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal properties of materials · Thermal Radiation and Cooling Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Guangxi Key Laboratory for Relativistic Astrophysics, Department of Physics, Guangxi University, Nanning 530004, P. R. China

Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, 710054, Xi’an, P. R. China

Department of Materials Science and Engineering, National University of Singapore, 117546, Singapore

LITEN, CEA-Grenoble, 17 rue des Martyrs, 38054 Cedex 9, Grenoble, France

School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China

International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, P. R. China

Department of Physics, South University of Science and Technology of China, Shenzhen 518055, P. R. China

Funding

Natural Science Foundation of Guangxi Province · National Natural Science Foundation of China · Guangxi Key Laboratory Foundation · Scientific Research Foundation of GuangXi University

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