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Concerted Rattling in CsAg 5 Te 3 Leading to Ultralow Thermal Conductivity and High Thermoelectric Performance

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [1];  [3];  [1];  [4];  [2];  [5];  [6];  [3];  [2]
  1. 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
  2. Department of Chemistry Northwestern University Evanston IL 60208 USA
  3. Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
  4. Department of Chemistry Northwestern University Evanston IL 60208 USA, Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
  5. 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
  6. 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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