| Title |
Research Paper - Mechanical Working : Powder Characteristics and Thermoelectric Properties of n - Type Bi2 ( Te0.95 Se0.05 )3 Fabricated by Mechanical Alloying Process |
| Authors |
김희정(H . J . Kim); 최재식(J . S . Choi); 현빈도(D . B . Hyun); 오태성(T . S . Oh) |
| Abstract |
Bi₂(Te_(0. 95)Se_(0. 05)₃ alloy powders have been fabricated by mechanical alloying process, and thermoelectric properties of the hot pressed Bi₂(Te_(0. 95)Se_(0. 05)₃have been investigated. Formation of Bi₂(Te_(0. 95)Se_(0. 05)₃ alloy powders was completed by mechanical alloying of the as-mixed Bi, Te, and Se granules of ∼3.6 ㎜ size for 2 hours at ball-to-material ratio of 5 : 1. Bi₂(Te_(0. 95)Se_(0. 05)₃, fabricated by mechanical alloying and hot pressed for 30minutes in vacuum at temperatures ranged from 300℃ to 550℃, exhibited n-type conduction without addition of donor dopant. When hot pressed at 550℃, figure of merit at 300K was 1.14×10^(-3)/K. |