발간논문

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Vol.35, No.2, 252 ~ 258, 1997
Title
Research Paper - Electronic. Magnetic & Optical Materials : Hot extrusion process and thermoelectric properties of p - type Bi0.5 Sb1.5 Te3 thermoelectric materials
이두면Doo Myun Lee, 송준호Jun Ho Seo, 김성용Sung Ryong Kim, 이지환Chi Hwan Lee
Abstract
The thermoelectric properties of p-type Bi_(0. 5)Sb_(1. 5)Te₃ thermoelectric materials, which were fabricated by extrusion at temperature ranged from 300 to 500℃ with various amounts of Te dopants (0 to 6 %), were studied. The microstructure of the thermoelectric materials was investigated by optical microscopy and scanning electron microscopy. The microstructure of the extruded specimen was dense, fine-grained, and elongated along the extrusion direction. The relative density increased with increasing extrusion temperature. The highest relative density (99.6 %) was obtained by extrusion at 440℃. The value of figure of merit (2.94×10^(-3)/K) was the highest at the extrusion temperature of 440℃ and at the dopant of 4 wt% Te.
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