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Vol.38, No.5, 716 ~ 722, 2000

Title

Pesearch Paper / Electronic , Magnetic & Optical Matrials : Power Generation Characteristics of the p - type (Bi0.2Sb0.8)Te3/(Pb0.7Sn0.3)Te Functional Gradient Material Fabricated by Hot Pressing Method

연대중Dae Joong Yeon,오태성Tae Sung Oh,현도빈Dow Bin Hyun

Abstract

The functional gradient material of p-type (Bi_(0.2)Sb_(0.8))₂Te₃/(Pb_(0.7)Sn_(0.3))Te with the segment ratio of 1.3 : 1 was fabricated by hot pressing of the mechanically alloyed (Bi_(0.2)Sb_(0.8))₂Te₃ and 0.5 at% Na₂Te-doped (Pb_(0.7)Sn_(0.3))Te powders. The power generation characteristics of the hot-pressed (Bi_(0.2)Sb_(0.8))₂Te₃/(Pb_(0.7)Sn_(0.3))Te were measured and compared with those of the (Bi_(0.2)Sb_(0.8))₂Te₃and 0.5 at% Na₂Te-doped (Pb_(0.7)Sn_(0.3))Te alloys. With the temperature difference (ΔT) higher than 300℃ at both ends of the specimen, the hot-pressed (Bi_(0.2)Sb_(0.8))₂Te₃/(Pb_(0.7)Sn_(0.3))Te exhibited larger output power than those of the (Bi_(0.2)Sb_(0.8))₂Te₃ and 0.5 at% Na₂Te-doped (Pb_(0.7)Sn_(0.3))Te alloys. The maximum output power of the (Bi_(0.2)Sb_(0.8))₂Te₃/(Pb_(0.7)Sn_(0.3))Te predicted with the measured Seebeck coefficient and the estimated electrical resistivity was in good agreement with the measured values.

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