발간논문

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Vol.35, No.2, 216 ~ 223, 1997
Title
Research Paper - Mechanical Working : Thermoelectric properties of p - type Bi0.5 Sb.15 Te3 thermoelectric materials fabricated by hot press method
이면두Doo Myun Lee, 이성호Seong Ho Lee, 송준호Jun Ho Seo, 이지환Chi Hwan Lee
Abstract
The p-type BiS_(0. 5)Sb_(1. 5)Te₃ thermoelectric materials were fabricated by hot pressing with various starting powders (size of 44 to 149 ㎛). Hot pressing was performed at temperature ranged from 380 to 450℃ and pressures of 100 to 200 MPa. The microstructure, mechanical properties, and thermoelectric properties of the materials were investigated. Optical microscopy and scanning electron microscopy were used to investigate the detailed microstructure. The microstructure showed fine grains elongated along the pressing direction. The figure of merit increased with increasing the hot pressing temperature and pressure due to the increase in carrier mobility and the decrease in lattice thermal conductivity. The materials, fabricated with starting podwers of 44∼75 ㎛ at 420℃, 200 MPa, showed the highest value of figure of merit (2.69×10^(-3)/K).
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