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Vol.37, No.3, 340 ~ 346, 1999
Title
Research Paper / Electronic Magnetic & Optical Materials : Thermoelectric Properties of the Hot - Pressed ( Pb0.7Sn0.3 ) Te with Addition of Na2Te
이선경Sung Kyung Lee, 이광응Kwang Eung Lee, 이준수Jun Soo Lee, 현도빈Dow Bin Hyun, 이희웅Hee Woong Lee, 오태성Tae Sung Oh
Abstract
Thermoelectric properties of (Pb_(0.7)Sn_(0.3))Te alloy, fabricated by mechanical alloying and hot pressing, were investigated with addition of Na₂Te up to 1.5 at% as acceptor dopant. A transition from p-type to n-type occurred at 425℃ for the undoped (Pb_(0.7)Sn_(0.3))Te. With doping Na₂ Te more than 0.1 at%, however, the hot-pressed (Pb_(0.7)Sn_(0.3))Te exhibited ptype conduction up to 450℃. Electrical resistivity of the hot-pressed (Pb_(0.7)Sn_(0.3)) Te increased by reduction treatment of the powders in hydrogen atmosphere before hot pressing, which was due to the fact that oxide layer on the powder surface was removed by reduction treatment. Figure-of-merit of the hot-pressed (Pb_(0.7)Sn_(0.3))Te was optimized to be 0.83×10^(-3)/K at 200℃ with doping 0.5 at% Na₂Te.
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