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Thermoelectric properties of nonstoichiometric Ag1-xPb18SbTe20 materials

Yan Yong-Gao Tang Xin-Feng Liu Hai-Jun Yin Ling-Ling Zhang Qing-Jie

Thermoelectric properties of nonstoichiometric Ag1-xPb18SbTe20 materials

Yan Yong-Gao, Tang Xin-Feng, Liu Hai-Jun, Yin Ling-Ling, Zhang Qing-Jie
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  • Abstract views:  3334
  • PDF Downloads:  1292
  • Cited By: 0
Publishing process
  • Received Date:  30 October 2006
  • Accepted Date:  29 November 2007
  • Published Online:  20 June 2007

Thermoelectric properties of nonstoichiometric Ag1-xPb18SbTe20 materials

  • 1. 武汉理工大学材料复合新技术国家重点实验室,武汉 430070

Abstract: Ag1-xPb18SbTe20(x=0,0.25,0.5,0.75) samples were prepared by melt-quench-spark plasma sintering(SPS). As the Ag content decreased, a second phase Sb2Te3 occurred in samples and the carrier concentration increased to 5×1018cm-3 and then ceased to increase as Ag content decreased further. The carrier mobility decreased first, and then increased, as the Ag content decreased. As temperature increased, the carrier scattering mechanism shifted gradually from ionized impurity scattering to acoustic phonon scattering. As the Ag content decreased, the electric conductivity increased while the Seebeck coefficient decreased, and the thermal conductivity show an increasing trend.

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