Title

Thermoelectric Properties of the Tetradymite-Type Bi2Te2S-Sb2Te2S Solid Solution

Abstract

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.

Department(s)

Physics

Keywords and Phrases

Carbon Fiber Reinforced Plastics; Chalcogenides; Crystal Structure; Crystallization; Diffraction; Metalloids; Solid Solutions; Solidification; Thermal Conductivity; Thermoanalysis; Thermoelectric Equipment; Tin; X Ray Diffraction; Electric Properties; Electrical Properties; Semiconductivity

International Standard Serial Number (ISSN)

0025-5408

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2009 Elsevier, All rights reserved.

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