Thermoelectric properties of n-type (Bi2Se3)x(Bi2Te3)1-x prepared by bulk mechanical alloying and hot pressing

J. Y. Yang, T. Aizawa, A. Yamamoto, T. Ohta

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Abstract

Starting from element Bi, Se and Te granules, n-type (Bi2Se3)x(Bi2Te3)1-x with different chemical composition (x = 0.025, 0.05, 0.075, 0.10 and 0.15) were prepared via bulk mechanical alloying (BMA) and hot pressing (HP). Effects of chemical composition, doping content and annealing on thermoelectric properties were reported. The range x≤0.050 is more favorable than other chemical compositions for the thermoelectric properties of BMAed (Bi2Se3)x(Bi2Te3)1-x. When doping with SbI3, both the electrical resistivity and the Seebeck coefficient of (Bi2Se3)0.05(Bi2Te3)0.95 decrease, thus resulting in no improvement of the figure of merit. On the other hand, annealing the as-HPed (Bi2Se3)0.05(Bi2Te3)0.95 a sufficiently long time is helpful to improve thermoelectric properties, and the maximum figure of merit of (Bi2Se3)0.05(Bi2Te3)0.95 is 2.31×10-3 /K.

Original languageEnglish
Pages (from-to)326-330
Number of pages5
JournalJournal of Alloys and Compounds
Volume312
Issue number1-2
DOIs
Publication statusPublished - 2000 Nov 16

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ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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