발간논문

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Vol.35, No.2, 223 ~ 231, 1997
Title
Research Paper - Mechanical Working : Powder Characteristics and Thermoelectric Properties of n - Type Bi2 ( Te0.95 Se0.05 )3 Fabricated by Mechanical Alloying Process
김희정H . J . Kim, 최재식J . S . Choi, 현빈도D . B . Hyun, 오태성T . 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.
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