Thermoelectric properties of p-type pseudo-binary (Ag0.365Sb0.558Te)x–(Bi0.5Sb1.5Te3)1−x (x=0–1.0) alloys prepared by spark plasma sintering

✍ Scribed by J.L. Cui; H.F. Xue; W.J. Xiu; L. Jiang; P.Z. Ying

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 201 KB
• Volume: 179
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2006.08.016

✦ Synopsis

In this paper, pseudo-binary (Ag 0.365 Sb 0.558 Te) x -(Bi 0.5 Sb 1.5 Te 3 ) 1Àx (x ¼ 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 Â 10 4 to 15.6 Â 10 4 O À1 m À1 at temperatures of 507 and 318 K, respectively, being about 3.0 and 8.5 times those of Bi 0.5 Sb 1.5 Te 3 alloy at the corresponding temperatures. The optimal dimensionless figure of merit (ZT) of the sample with molar fraction x ¼ 0.025 reaches 1.1 at 478 K, whereas that of the ternary Bi 0.5 Sb 1.5 Te 3 alloy is 0.58 near room temperature. The results also reveal that a direct introduction of Ag 0.365 Sb 0.558 Te in the Bi-Sb-Te system is much more effective to the property improvement than naturally precipitated Ag 0.365 Sb 0.558 Te in the Ag-doped Ag-Bi-Sb-Te system.