| Title |
Formation of Bi2Te3 Alloy by Mechanical Alloying of Elemental Bi and Te Powders |
| Authors |
남승의(Seoung Eui Nam); 최재식(Jae Shik Choi); 현도빈(Dow Bin Hyun); 오태성(Tae Sung Oh) |
| Abstract |
Mechanical alloying behavior of Bi₂Te₃ alloy, which is the basic composition of thermoelectric materials used for thermoelectric cooling applications, has been investigated with variations of milling time and ball-to-powder weight ratio. Formation of Bi₂Te₃ intermetallic compound was completed by mechanical alloying of elemental Bi and Te powders for 1 hour at ball-to-powder weight ratio of 2 : 1 Processing time for completion of Bi₂Te₃ formation was found to be inversely proportional to the ball-to-powder weight ratio. Formation of Bi₂Te₃ was completed by mechanical alloying for 30 minutes and 10 minutes at ball-to-powder weight ratio of 4:1 and 10:1, respectively. Lattice constants of Bi₂Te₃ processed by mechanical alloying, a=0.4387㎚ and c=3.0481㎚, were not varied with ball-to-powder weight ratio and milling time. Lattice parameters of mechanically alloyed Bi₂Te₃ are in excellent agreement with values of a=0.4385㎚ and c=3.0483㎚, which were reported for Bi₂Te₃ powders processed by melting and grinding. |