Investigation of thermoelectric materials: Substitution effect of Bi on the Ag1-xPb18MTe20 (M = Sb, Bi) (x = 0, 0.14, 0.3)

Mi Kyung Han, Huijun Kong, Ctirad Uher, Mercouri G. Kanatzidis

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

We performed comparative investigations of the Ag1-xPb 18MTe20 (M = Bi, Sb) (x = 0, 0.14, 0.3) system to better understand the roles of Sb and Bi on the thermoelectric properties. In both systems, the electrical conductivity nearly keeps the same values, while the Seebeck coefficient decreases dramatically in going from Sb to Bi. Compared to the lattice thermal conductivity of PbTe, that of AgPh18BiTe 20 is substantially reduced. The lattice thermal conductivity of the Bi analog, however, is higher than that of AgPb18SbTe20 and this is attributed largely to the decrease in the degree of mass fluctuation between the nanostructures and the matrix (for the Bi analog). As a result the dimensionless figure of merit ZT of Ag1-xPb18MTe 20 (M = Bi) is found to be smaller than that of Ag 1-xPb18MTe20 (M = Sb).

Original languageEnglish
Pages (from-to)95-100
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume1044
Publication statusPublished - Oct 9 2008
EventThermoelectric Power Generation - Boston, MA, United States
Duration: Nov 26 2007Nov 29 2007

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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