Concerted Rattling in CsAg 5 Te 3 Leading to Ultralow Thermal Conductivity and High Thermoelectric Performance
- Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 P.R. China
- Department of Chemistry Northwestern University Evanston IL 60208 USA
- Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
- Department of Chemistry Northwestern University Evanston IL 60208 USA, Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China, Department of Physics University of Michigan Ann Arbor MI 48109 USA
- Department of Physics University of Michigan Ann Arbor MI 48109 USA
Abstract
Thermoelectric (TE) materials convert heat energy directly into electricity, and introducing new materials with high conversion efficiency is a great challenge because of the rare combination of interdependent electrical and thermal transport properties required to be present in a single material. The TE efficiency is defined by the figure of merit ZT =( S 2 σ ) T / κ , where S is the Seebeck coefficient, σ is the electrical conductivity, κ is the total thermal conductivity, and T is the absolute temperature. A new p‐type thermoelectric material, CsAg 5 Te 3 , is presented that exhibits ultralow lattice thermal conductivity (ca. 0.18 Wm −1 K −1 ) and a high figure of merit of about 1.5 at 727 K. The lattice thermal conductivity is the lowest among state‐of‐the‐art thermoelectrics; it is attributed to a previously unrecognized phonon scattering mechanism that involves the concerted rattling of a group of Ag ions that strongly raises the Grüneisen parameters of the material.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- SC0014520
- OSTI ID:
- 1400779
- Journal Information:
- Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 38 Vol. 55; ISSN 1433-7851
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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