Thermoelectric properties of Bi–Sb–Te materials prepared by electric current stressing

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• 作者：Chien-Neng Liao ; Li-Chieh Wu ; Jinn-Shing Lee
• 关键词：Sintering ; Powder metallurgy ; Thermoelectric materials ; Electrical transport
• 刊名：Journal of Alloys and Compounds
• 出版年：2010
• 出版时间：4 February 2010
• 年：2010
• 卷：490
• 期：1-2
• 页码：468-471
• 全文大小：529 K

文摘

Bi_0.5Sb_1.5Te₃ compounds were prepared by cold-press and thermal/electrical sintering process. A high-density electric current (100 A/cm²) was introduced through the cold-pressed Bi_0.5Sb_1.5Te₃ samples during pressure-free sintering at a temperature 200 °C. The electrically sintered Bi_0.5Sb_1.5Te₃ shows a 6-fold increase in carrier mobility and 60 % reduction in carrier density as compared to the thermally sintered sample. The change in carrier transport properties is suggested to be associated with the elimination of charged defects in Bi_0.5Sb_1.5Te₃ crystal during electric current stressing. An electric current induced defect restoration mechanism is proposed to explain the enhanced carrier transport property of the electrically sintered Bi_0.5Sb_1.5Te₃.