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Thermoelectric properties and microstructures of AgSbTe2-added p-type Pb0.16Ge0.84Te

✍ Scribed by Yusufu, Aikebaier ;Kurosaki, Ken ;Sugahara, Tohru ;Ohishi, Yuji ;Muta, Hiroaki ;Yamanaka, Shinsuke

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
454 KB
Volume
209
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

The alloys in the AgSbTe~2~GeTe system and the AgSbTe~2~PbTe system are known as excellent thermoelectric (TE) materials, i.e. TAGS and LAST, respectively. Although the TE properties of the AgSbTe~2~(Pb,Ge)Te system have not been reported. Here, we show the high‐temperature TE properties of the alloys in the AgSbTe~2~(Pb,Ge)Te system. The samples of (Ag~0.5~Sb~0.5~Te)~100−x~(Pb~0.16~Ge~0.84~Te)~x~ (x = 75, 80, 85, and 90) were prepared and the electrical resistivity (ρ), Seebeck coefficient (S), and thermal conductivity (κ) were examined in the temperature range from room temperature to 720 K. The samples prepared by hot‐press were composed of two phases: the GeTe‐based matrix phase and the PbTe‐based precipitate. These samples exhibited the moderate ρ and S as well as relatively low κ, leading to high thermoelectric figure of merit ZT (= S^2^T/ρκ, where T is the absolute temperature). The maximum ZT value was 0.84 at 720 K obtained in the sample of x = 80.

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