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Title: Structures and thermoelectric properties of the infinitely adaptive series (Bi{sub 2}){sub m}(Bi{sub 2}Te{sub 3}){sub n}

Abstract

The structures and thermoelectric properties of the (Bi{sub 2}){sub m}(Bi{sub 2}Te{sub 3}){sub n} homologous series, derived from stacking hexagonal Bi{sub 2} and Bi{sub 2}Te{sub 3} blocks, are reported. The end members of this series are metallic Bi and semiconducting Bi{sub 2}Te{sub 3}; 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 Bi{sub 2}Te{sub 3} to p type for phases rich in Bi{sub 2} blocks but with some Bi{sub 2}Te{sub 3} blocks present, to n type again for Bi metal. The thermoelectric power factor (S{sup 2}/{rho}) is highest for Bi metal (43 {mu}W/K{sup 2} cm at 130 K), followed by Bi{sub 2}Te{sub 3} (20 {mu}W/K{sup 2} cm at 270 K), while Bi{sub 2}Te (m:n=5:2) and Bi{sub 7}Te{sub 3} (m:n=15:6) have 9 {mu}W/K{sup 2} cm (at 240 K) and 11 {mu}W/K{sup 2} cm (at 270 K), respectively. The results of doping studies with Sb and Se into Bi{sub 2}Te are reported.

Authors:
;  [1];  [2]; ;  [3]
  1. Department of Chemistry, Princeton University, Princeton, New Jersey 08544 (United States)
  2. National Centre for High Resolution Electron Microscopy, Department of Nanoscience, Delft Institute of Technology, 2628 CJ, Delft (Netherlands)
  3. Department of Physics, Princeton University, Princeton, New Jersey 08544 (United States)
Publication Date:
OSTI Identifier:
20951429
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 19; Other Information: DOI: 10.1103/PhysRevB.75.195203; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIMONY; BISMUTH; BISMUTH TELLURIDES; COMPARATIVE EVALUATIONS; CRYSTAL STRUCTURE; HEXAGONAL CONFIGURATION; POWER FACTOR; SELENIUM; SEMICONDUCTOR MATERIALS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0065-0273 K; THERMOELECTRIC PROPERTIES

Citation Formats

Bos, J. W. G., Cava, R. J., Zandbergen, H. W., Lee, M.-H., and Ong, N. P. Structures and thermoelectric properties of the infinitely adaptive series (Bi{sub 2}){sub m}(Bi{sub 2}Te{sub 3}){sub n}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.195203.
Bos, J. W. G., Cava, R. J., Zandbergen, H. W., Lee, M.-H., & Ong, N. P. Structures and thermoelectric properties of the infinitely adaptive series (Bi{sub 2}){sub m}(Bi{sub 2}Te{sub 3}){sub n}. United States. doi:10.1103/PHYSREVB.75.195203.
Bos, J. W. G., Cava, R. J., Zandbergen, H. W., Lee, M.-H., and Ong, N. P. Tue . "Structures and thermoelectric properties of the infinitely adaptive series (Bi{sub 2}){sub m}(Bi{sub 2}Te{sub 3}){sub n}". United States. doi:10.1103/PHYSREVB.75.195203.
@article{osti_20951429,
title = {Structures and thermoelectric properties of the infinitely adaptive series (Bi{sub 2}){sub m}(Bi{sub 2}Te{sub 3}){sub n}},
author = {Bos, J. W. G. and Cava, R. J. and Zandbergen, H. W. and Lee, M.-H. and Ong, N. P.},
abstractNote = {The structures and thermoelectric properties of the (Bi{sub 2}){sub m}(Bi{sub 2}Te{sub 3}){sub n} homologous series, derived from stacking hexagonal Bi{sub 2} and Bi{sub 2}Te{sub 3} blocks, are reported. The end members of this series are metallic Bi and semiconducting Bi{sub 2}Te{sub 3}; 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 Bi{sub 2}Te{sub 3} to p type for phases rich in Bi{sub 2} blocks but with some Bi{sub 2}Te{sub 3} blocks present, to n type again for Bi metal. The thermoelectric power factor (S{sup 2}/{rho}) is highest for Bi metal (43 {mu}W/K{sup 2} cm at 130 K), followed by Bi{sub 2}Te{sub 3} (20 {mu}W/K{sup 2} cm at 270 K), while Bi{sub 2}Te (m:n=5:2) and Bi{sub 7}Te{sub 3} (m:n=15:6) have 9 {mu}W/K{sup 2} cm (at 240 K) and 11 {mu}W/K{sup 2} cm (at 270 K), respectively. The results of doping studies with Sb and Se into Bi{sub 2}Te are reported.},
doi = {10.1103/PHYSREVB.75.195203},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 19,
volume = 75,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}