摘要
Bi–Sb–Se–Te is one of the most important material systems for thermoelectric applications. Phase diagrams of its constituent binary and ternary systems are reviewed and assessed. The Bi–Sb–Se–Te isothermal section tetrahedron at 400 °C and liquidus projection tetrahedron were proposed. Ternary compounds are only found in the Bi–Sb–Se system. There are eight three-phase regions at 400 °C and seven primary solidification phases in the Bi–Sb–Se system, including (Bi,Sb), (Bi 2 ) m (Bi 2 Se 3 ) n , Bi 2 Se 3 , Se, Sb 2 Se 3 , Bi 3 Sb 5 Se 2 , Bi 3 Sb 12 Se 15 . In the Bi–Sb–Te system, there are four three-phase regions at 400 °C. The (Bi,Sb) 2 Te 3 and (Bi,Sb) are continuous solid solutions. There are six primary solidification phases, including (Bi,Sb) 2 Te 3 , (Te), γ, δ, (Bi,Sb), and (Bi 2 ) m (Bi 2 Te 3 ) n . In the Bi–Se–Te system, there is one three-phase region. (Bi 2 ) m (Bi 2 Se 3 ) n and (Bi 2 ) m (Bi 2 Te 3 ) n form a continuous solid solution phase at 400 °C. There are four primary solidification phases, including Bi, (Bi 2 ) m (Bi 2 (Se,Te) 3 ) n , Bi 2 (Se,Te) 3 and (Se,Te). In the Sb–Se–Te system, there are five three-phase regions and six primary solidification phases, including (Sb), δ-(Sb 2 Te), γ-(SbTe), Sb 2 Te 3 , and (Se,Te). A wide range of (Bi,Sb) 2 (Se,Te) 3 single-phase region was observed in the Bi–Sb–Se–Te quaternary system.