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Thermoelectric properties and microstructures of AgSbTe 2 ‐added p‐type Pb 0.16 Ge 0.84 Te
Author(s) -
Yusufu Aikebaier,
Kurosaki Ken,
Sugahara Tohru,
Ohishi Yuji,
Muta Hiroaki,
Yamanaka Shinsuke
Publication year - 2012
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201127194
Subject(s) - materials science , thermoelectric effect , seebeck coefficient , electrical resistivity and conductivity , thermoelectric materials , thermal conductivity , atmospheric temperature range , microstructure , figure of merit , analytical chemistry (journal) , condensed matter physics , metallurgy , thermodynamics , optoelectronics , composite material , chemistry , electrical engineering , physics , chromatography , engineering
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.