Thermoelectric properties of p-type (Bi,Sb)2Te3 alloys fabricated by the hot pressing method |
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Authors: | Hee-Jeong Kim Hang-Chong Kim Dow-Bin Hyun Tae-Sung Oh |
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Affiliation: | (1) Department of Metallurgy and Materials Science, Hong Ik University, 121-791 Seoul, Korea;(2) Division of Metals, Korea Institute of Science and Technology, 136-791 Seoul, Korea |
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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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Keywords: | bismuth antimony telluride thermoelectric materials powder processing mechanical alloying hot pressing |
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