摘要
Bi–Sb–Se is an important thermoelectric material system. However, a phase diagram of the entire compositional range is not available in the literature. This study determines the Bi–Sb–Se liquidus projection and its phase equilibria isothermal section at 400 °C. Ternary Bi–Sb–Se alloys are prepared. Their primary solidification phases and invariant reactions are determined. There are seven primary solidification phases, (Se), Bi 2 Se 3 , Sb 2 Se 3 , (Bi,Sb), (Bi 2 ) m (Bi 2 Se 3 ) n , Bi 3 Sb 5 Se 2 and Bi 3 Sb 12 Se 5 . Both Bi 3 Sb 5 Se 2 and Bi 3 Sb 12 Se 5 are newly found ternary compounds. In the Bi–Sb–Se isothermal section at 400 °C, there are eight three-phase regions. Besides these two ternary compounds, the other single phases are, Sb 2 Se 3 , Bi 2 Se 3 , (Bi 2 ) m (Bi 2 Se 3 ) n , Liquid (Bi,Sb), Liquid (Se), and (Bi,Sb) phases. It has been found the solubilities of Sb in the (Bi 2 ) m (Bi 2 Se 3 ) n and Bi 2 Se 3 compounds are significant.