Abstract
In this work, p-type 20%Bi2Te3–80%Sb2Te3 bulk thermoelectric (TE) materials were prepared by mechanical deformation (MD) of pre-melted ingot and by mechanical alloying (MA) of elemental Bi, Sb, and Te granules followed by cold-pressing. The dependence on annealing time of changes of microstructure and TE properties of the prepared samples, including Seebeck coefficient, electrical resistivity, thermal conductivity, and figure-of-merit, was investigated. For both samples, saturation of the Seebeck coefficient and electrical resistivity were observed after annealing for 1 h at 380°C. It is suggested that energy stored in samples prepared by both MA and MD facilitated their recrystallization within short annealing times. The 20%Bi2Te3–80%Sb2Te3 sample prepared by MA followed by heat treatment had higher a Seebeck coefficient and electrical resistivity than specimens fabricated by MD. Maximum figures-of-merit of 3.00 × 10−3/K and 2.85 × 10−3/K were achieved for samples prepared by MA and MD, respectively.
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This research was supported by the Converging Research Center Program through the Ministry of Science, ICT, and Future Planning (2013K000168).
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Lee, DH., Lee, JU., Jung, SJ. et al. Effect of Heat Treatment on the Thermoelectric Properties of Bismuth–Antimony–Telluride Prepared by Mechanical Deformation and Mechanical Alloying. J. Electron. Mater. 43, 2255–2261 (2014). https://doi.org/10.1007/s11664-014-3037-1
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DOI: https://doi.org/10.1007/s11664-014-3037-1