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Thermoelectric Properties of Tl2Te-Sb2Te3 Pseudo-Binary System

Published online by Cambridge University Press:  01 February 2011

Ken Kurisaki ,
Keita Goto ,
Atsuko Kosuga ,
Hiroaki Muta  and
Shinsuke Yamanaka
Ken Kurisaki
Affiliation:
kurosaki@nucl.eng.osaka-u.ac.jp
Keita Goto
Affiliation:
k-goto@stu.nucl.eng.osaka-u.ac.jp, Osaka University, Division of Sustainable Energy and Environmental Engineering, Japan
Atsuko Kosuga
Affiliation:
kosuga@nucl.eng.osaka-u.ac.jp
Hiroaki Muta
Affiliation:
muta@nucl.eng.osaka-u.ac.jp
Shinsuke Yamanaka
Affiliation:
yamanaka@nucl.eng.osaka-u.ac.jp
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Abstract

Polycrystalline-sintered samples of thallium based substances, (Tl2Te)100−x(Sb2Te3)x (x= 0, 1, 5, 10), were prepared by melting Tl2Te and Sb2Te3 ingots followed by annealing in sealed quartz ampoules. The thermoelectric properties were measured from room temperature to around 600 K. The values of the Seebeck coefficient of all samples are positive, indicating a p-type conduction characteristic. The maximum value of the power factor is 6.53×10−4 Wm−1K−2 at 591 K obtained for x= 10 (Tl9SbTe6), which is about one order lower than those of state-of-the-art thermoelectric materials. All samples indicate an extremely low thermal conductivity, for example that of Tl2Te is approximately 0.35 Wm−1K−1 from room temperature to around 600 K. Although the electrical performance of the samples is not so good, the ZT value is relatively high due to the extremely low thermal conductivity. The maximum ZT value is 0.42 at 591 K obtained for Tl9SbTe6.

Keywords

thermoelectricitythermal conductivityTl
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 886: Symposium F – Materials and Technologies fore Direct Thermal-to-Electric Energy Conversion , 2005 , 0886-F08-03
Copyright
Copyright © Materials Research Society 2006

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References

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