Thermoelectric Properties of Ternary Alloy Ag0.405Sb 0.532Te Prepared by Spark Plasma Sintering

✍ Scribed by Ying Pengzhan; Fu Hong; Chen Dongyong

• Publisher: Elsevier
• Year: 2010
• Weight: 117 KB
• Volume: 39
• Category: Article
• ISSN: 1875-5372
• DOI: 10.1016/s1875-5372(10)60090-2

✦ Synopsis

The ternary Ag 0.405 Sb 0.532 Te alloy was prepared by spark plasma sintering, and its transport properties involving Seebeck coefficients, electrical and thermal conductivities were evaluated. The results reveal that the electrical conductivity mildly decreases from 7.6×10 4 S•m -1 to 6.6×10 4 S•m -1 when the temperature increases from 316 K, to 548 K. Above 438 K, the thermal conductivity gradually increases with the increase of the temperature, and below 438 K, a relative stable value of about 0.86 W•K -1 •m -1 is obtained. The maximum thermoelectric figure of merit ZT is up to 0.65 at 548 K, a little higher than 0.61 of the ternary alloy Ag 0.365 Sb 0.558 Te. The thermoelectric properties have been improvement compared with the Ag-doped Ag x Bi 0.5 Sb 1.5-x Te 3 alloys (x=0-0.4). The action mechanism of the second phase Ag-Sb-Te ternary alloy precipitated in the Ag x Bi 0.5 Sb 1.5-x Te 3 alloys has been re-discussed.