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Title: Panoscopic approach for high-performance Te-doped skutterudite

One-step plasma-activated sintering (OS-PAS) fabrication of single-phase high-performance CoSb 3-based skutterudite thermoelectric material with a hierarchical structure on a time scale of a few minutes is first reported here. The formation mechanism of the CoSb 3 phase and the effects of the current and pressure fields on the phase transformation and microstructure evolution are studied in the one-step PAS process. The application of the panoscopic approach to this system and its effect on the transport properties are investigated. The results show that the hierarchical structure forms during the formation of the skutterudite phase under the effects of both current and sintering pressure. The samples fabricated by the OS-PAS technique have defined hierarchical structures, which scatter phonons more intensely over a broader range of frequencies and significantly reduce the lattice thermal conductivity. High-performance bulk Te-doped skutterudite with the maximum ZT of 1.1 at 820 K for the composition CoSb 2.875Te 0.125 was obtained. Such high ZT values rival those obtained from single filled skutterudites. As a result, this newly developed OS-PAS technique enhances the thermoelectric performance, dramatically shortens the synthesis period and provides a facile method for obtaining hierarchical thermoelectric materials on a large scale.
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  1. Wuhan Univ. of Technology, Hubei (China). State Key Lab. of Advanced Technology for Materials Synthesis and Processing
  2. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
  3. Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
Publication Date:
Grant/Contract Number:
PI0000012; 2013CB632502; 51172174; 51402222; 51521001; 51632006; B07040
Accepted Manuscript
Journal Name:
NPG Asia Materials (Online)
Additional Journal Information:
Journal Name: NPG Asia Materials (Online); Journal Volume: 9; Journal Issue: 2; Journal ID: ISSN 1884-4057
Nature Publishing Group Asia
Research Org:
Wuhan Univ. of Technology, Hubei (China); Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); National Basic Research Program of China; Natural Science Foundation of China; 111 Project of China
Contributing Orgs:
Northwestern Univ., Evanston, IL (United States)
Country of Publication:
United States
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1362283