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Synthesis and Thermolelectric Properties of Bi2Te3-GeTe Pseudo Binary System

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Abstract:

Bi2Te3 is the best compound for thermoelectric materials around the room temperature. If the temperature range is shifted to higher side, it is useful to obtain electrical energy from waste heat source which is abundant at the temperature around 500 K. In this experiment, Bi2Te3-GeTe pseudo binary compounds were investigated to shift the temperature range. The lattice thermal conductivity was remarkably decreased at 50 or 75 mol%GeTe by synergy effect of solid solution and grain boundaries. The peak temperature of figure of merit Z for Bi2Te3-GeTe pseudo binary compounds was higher than Bi2Te3.

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Periodical:

Advances in Science and Technology (Volume 46)

Pages:

168-173

DOI:

https://doi.org/10.4028/www.scientific.net/AST.46.168

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Online since:

October 2006

Authors:

Hitoshi Kohri, Ichiro Shiota, Masahiko Kato, Isao J. Ohsugi, Takashi Goto

Keywords:

Germanium Telluride, Layer Structure, Tetradymite, Thermoelectric Material

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

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[2] [4] [6] [1] [3] [5] [7] 250 350 450 550Thermal conductivity, κ[Wm-1K-1] GeTe.

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[25] mol%GeTe.

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[50] mol%GeTe.

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[75] mol%GeTe.

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[95] mol%GeTe Bi2Te3.

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[5] mol%GeTe Temperature, [K].

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[2] [4] [6] [1] [3] [5] [7] 250 350 450 550Thermal conductivity, κ[Wm-1K-1] GeTe.

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[25] mol%GeTe.

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[50] mol%GeTe.

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[75] mol%GeTe.

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[95] mol%GeTe Bi2Te3.

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[5] mol%GeTe GeTe.

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[25] mol%GeTe.

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[50] mol%GeTe.

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[75] mol%GeTe.

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[95] mol%GeTe Bi2Te3.

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[5] mol%GeTe Temperature, [K] Figure 11 Temperature dependence of thermal conductivity for Bi2Te3-GeTe. GeTe.

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[25] mol%GeTe.

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[50] mol%GeTe.

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[75] mol%GeTe.

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[95] mol%GeTe Bi2Te3.

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[5] mol%GeTe Temperature, [K] 250 350 450 550 10-7 10-6 10-5 10-4 10-3 Figure of merit, Z [K-1]10-210-2 GeTe.

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[25] mol%GeTe.

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[50] mol%GeTe.

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[75] mol%GeTe.

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[95] mol%GeTe Bi2Te3.

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[5] mol%GeTe GeTe.

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[25] mol%GeTe.

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[50] mol%GeTe.

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[75] mol%GeTe.

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[95] mol%GeTe Bi2Te3.

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[5] mol%GeTe Temperature, [K] 250 350 450 550 10-710-7 10-610-6 10-510-5 10-410-4 10-310-3 Figure of merit, Z [K-1]10-210-210-210-2 Figure 12 Temperature dependence of figure of merit for Bi2Te3-GeTe.

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