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Thermoelectric properties of p-type (Bi,Sb)2Te3 alloys fabricated by the hot pressing method

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Abstract

P-type (Bi0.25Sb0.75)2Te3 powders were fabricated by melting/grinding and mechanical alloying processes. Thermoelectric properties of the hot-pressed (Bi0.25Sb0.75)2Te3 were characterized with the powder processing method, powder size, hot pressing temperature, and the amount of excess-Te dopant. Specimens fabricated by melting/grinding exhibited lower Seebeck coefficient, lower electrical resistivity and higher thermal conductivity, compared to the specimens prepared by mechanical alloying. 3 wt.% excess Te-doped (Bi0.25Sb0.75)2 Te3, fabricated by melting/grinding and hot pressing at 550°C, exhibited a figure-merit of 3.2 x 10-3/K. For 1 wt.% excess Te-doped specimen prepared by mechanical alloying and hot pressing at 550°C, a figure-merit of 3.05 x 10-3/K was obtained.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, Hong Ik University, 121-791, Seoul, Korea

    Hee-Jeong Kim, Hang-Chong Kim & Tae-Sung Oh

  2. Division of Metals, Korea Institute of Science and Technology, 136-791, Seoul, Korea

    Dow-Bin Hyun

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  1. Hee-Jeong Kim
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  2. Hang-Chong Kim
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  4. Tae-Sung Oh
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Kim, HJ., Kim, HC., Hyun, DB. et al. Thermoelectric properties of p-type (Bi,Sb)2Te3 alloys fabricated by the hot pressing method. Metals and Materials 4, 75–81 (1998). https://doi.org/10.1007/BF03026068

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