Abstract
In this paper, pseudo-binary (Ag 0.365Sb 0.558Te) x –(Bi 0.5Sb 1.5Te 3) 1− x ( x=0–1.0) alloys were prepared using spark plasma sintering technique, and the composition-dependent thermoelectric properties were evaluated. Electrical conductivities range from 7.9×10 4 to 15.6×10 4 Ω −1 m −1 at temperatures of 507 and 318 K, respectively, being about 3.0 and 8.5 times those of Bi 0.5Sb 1.5Te 3 alloy at the corresponding temperatures. The optimal dimensionless figure of merit ( ZT) of the sample with molar fraction x=0.025 reaches 1.1 at 478 K, whereas that of the ternary Bi 0.5Sb 1.5Te 3 alloy is 0.58 near room temperature. The results also reveal that a direct introduction of Ag 0.365Sb 0.558Te in the Bi–Sb–Te system is much more effective to the property improvement than naturally precipitated Ag 0.365Sb 0.558Te in the Ag-doped Ag–Bi–Sb–Te system.
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