Phase Equilibria of the Sn-Bi-Te Ternary System

作者：Chiu Chen Nan^*; Hsu Chia Ming; Chen Sinn Wen; Wu Hsin Jay

来源：Journal of Electronic Materials, 2012, 41(1): 22-31.

DOI：10.1007/s11664-011-1730-x

• Thermoelectric
• phase equilibria
• Bi(2)Te(3)
• Sn

Bi(2)Te(3) is one of the most promising thermoelectric materials, and Sn is the primary constituent of most electronic solders. Knowledge of phase equilibria of the Sn-Bi-Te ternary system is important for thermoelectric applications. Twenty-seven Sn-Bi-Te alloys were prepared and equilibrated at 160A degrees C and 500A degrees C. The equilibrium phases were determined, and the isothermal sections were constructed based on three binary constituent phase diagrams and ternary phase equilibria results. No ternary compounds were observed in the Sn-SnTe-Bi region. The SnTe phase is very stable and has tie-lines with the Sn, liquid, and Bi phases at 160A degrees C. At 500A degrees C, in addition to the already known SnBi(2)Te(4) and SnBi(4)Te(7) ternary phases, two new ternary compounds (Sn(2)Bi(2)Te(5) and SnBiTe(2) phases) were found. SnTe and Bi(2)Te(3) have significant mutual solubilities, and the ternary compounds SnBi(2)Te(4), SnBi(4)Te(7), and Sn(2)Bi(2)Te(5) are all in the SnTe-Bi(2)Te(3) pseudobinary section.

• 出版日期2012-1
• 单位清华大学