Largely Enhanced Figure of Merit for CoSb₃ Thermoelectric Material by Introducing Disordered Structure

Abstract:

To enhance the Seebeck coefficient and reduce the thermal conductivity and meanwhile keep an excellent electrical conductivity, the disordered structure was introduced into the ordered CoSb3 nanocrystalline by increasing hot-pressing temperature. The results show that the introduced disordered structure can increase the Seebeck coefficient from 125 VK-1 to 390 VK-1 measured at 773K, the thermal conductivity can be reduced from 1.94 Wm-1K-1 to 1.73 Wm-1K-1. Even though the electrical conductivity is decreased from 74000 Sm-1 to 14000 Sm-1, a largely enhanced figure of merit of 1.21 at 773 K still can be obtained for the sample hot-pressed at 943 K. Therefore, introducing the disordered structure into an ordered structure can be considered as an effective way to enhance the figure of merit.

• Periodical: Applied Mechanics and Materials (Volume 189)
• Pages: 87-91
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.189.87
• Online since: July 2012
• Authors: Peng Xian Lu, Man Man Lu
• Keywords: Dislocation, Nanostructure, Thermoelectricity

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