발간논문

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Vol.37, No.5, 609 ~ 614, 1999
Title
Research Paper / Electronic , Magnetic & Optical Materials : Thermoelectrie Properties of p-Type Bi2Te3-Sb2-Te3-Sb2Se3 Pseudo - Ternary Alloys Fabricated by Hot Pressing Method
이준수Jun Soo Lee, 김항종Hang Chong Kim, 현도빈Dow Bin Hyun, 오태성Tae Sung Oh
Abstract
P-type 20% Bi₂Te₃-(80-x)% Sb₂Te₃-x% Sb₂Se₃ (0≤x≤7) alloy powders, fabricated by mechanical alloying and melting/grinding processes, were hot pressed and their thermoelectric properties were characterized with the Sb₂Se₃ content and the powder processing method. The Seebeck coefficient and electrical resistivity of the hot-pressed 20% Bi₂Te₃-(80-x)% Sb₂Te₃-x% Sb₂Se₃ alloys increased with increasing the Sb₂Se₃ content due to the reduction of the hole concentration. Although the total thermal conductivity of the hot-pressed 20% Bi₂Te₃-(80-x)% Sb₂Te₃-x% Sb₂Se₃ alloys decreased with increasing the Sb₂Se₃ content due to the reduction of κ_(el), the lattice thermal conductivity κ_(ph) was not lowered. The figure-of-merit of the hot-pressed 20% Bi₂Te₃-(80-x)% Sb₂Te₃-x% Sb₂Se₃ alloys decreased with increasing the Sb₂Se₃ content, because the increment of the electrical resistivity was much larger than the decrement of the thermal conductivity and the increment of the Seebeck coefficient.
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