Thermoelectric properties of the tetradymite-type Bi2Te2S-Sb2Te2S solid solution

D. C. Grauer, Y. S. Hor, A. J. Williams, R. J. Cava

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The thermoelectric properties of the tetradymite-type Bi2-xSbxTe2S solid solution (0 ≤ x ≤ 2) are reported for the temperature range 5-300 K. The properties of non-stoichiometric, Cl and Sn doped n- and p-type variants are reported as well. The Seebeck coefficients for these materials range from -170 to +270 μV K-1 while the resistivities range from those of semimetals, 2 mΩ cm, to semiconductors, >1000 mΩ cm. Thermal conductivities were low for most compositions, typically 1.5 W m-1 K-1. Nominally undoped Bi2Te2S shows the highest thermoelectric efficiency amongst the tested materials with a ZT = 0.26 at 300 K that decreased to 0.04 at 100 K. The crystal structure of Sb2Te2S, a novel tetradymite-type material, is also reported.

Original languageEnglish (US)
Pages (from-to)1926-1929
Number of pages4
JournalMaterials Research Bulletin
Issue number9
StatePublished - Sep 2009

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


  • A. Chalcogenides
  • C. X-ray diffraction
  • D. Electrical properties
  • D. Semiconductivity
  • D. Thermal conductivity


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