Structures and thermoelectric properties of the infinitely adaptive series "Bi2…m"Bi2Te3…n

By J. Bos, H. Zandbergen, M.H. Lee, N. Ong, R. Cava. 2007

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The structures and thermoelectric properties of the Bi2mBi2Te3n homologous series, derived from stacking hexagonal Bi2 and Bi2Te3 blocks, are reported. The end members of this series are metallic Bi and semiconducting Bi2Te3; nine members of the series have been studied. The structures form an infinitely adaptive series and a unified structural description based on a modulated structure approach is presented. The as-synthesized samples have thermopowers S that vary from n type for Bi2Te3 to p type for phases rich in Bi2 blocks but with some Bi2Te3 blocks present, to n type again for Bi metal. The thermoelectric power factor S 2 / is highest for Bi metal 43 W/K 2 cm at 130 K, followed by Bi2Te3 20 W/K 2 cm at 270 K, while Bi2Te m:n=5:2 and Bi7Te3 m:n=15:6 have 9 W/K 2 cm at 240 K and 11 W/K 2 cm at 270 K, respectively. The results of doping studies with Sb and Se into Bi2Te are reported.

Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/8588aaed4d707bc053fbb019e9e101c6d1ca393c