Structures and thermoelectric properties of the infinitely adaptive series (Bi{sub 2}){sub m}(Bi{sub 2}Te{sub 3}){sub n}
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544 (United States)
- National Centre for High Resolution Electron Microscopy, Department of Nanoscience, Delft Institute of Technology, 2628 CJ, Delft (Netherlands)
- Department of Physics, Princeton University, Princeton, New Jersey 08544 (United States)
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.
- OSTI ID:
- 20951429
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 19 Vol. 75; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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