The dependence of phase selection in peritectic solidification of Bi–Te40 on cooling rates and liquid states

Controlling the Epitaxial Growth of Bi2Te3, BiTe, and Bi4Te3 Pure Phases by Physical Vapor Transport

“…Published Bi–Te phase diagrams ,,, predict other phases besides those we found in this work. We did not detect Bi 4 Te 5 , Bi 6 Te 7 , Bi 2 Te, or Bi 7 Te 3 in our experiments for any growth conditions.…”

“…Brown and Lewis 10 proposed a wide range of Bi 2 Te 3 stable compositions, while Abrikosov and Bankina 11 proposed the existence of other compositions. The Bi−Te system has been studied by different methods, and today, many authors 6,7,12 recognize the phase diagram reported by Okamoto et al 13 Stasova and Karpinskii 14 were the first to propose the presently accepted criterion that all phases in the Bi−Te system are a combination of Bi 2 and Bi 2 Te 3 blocks of the form (Bi 2 ) m (Bi 2 Te 3 ) n , where m and n are integers, as schematically shown in Figure 1. This model, which can be extended to Bi− Se and Sb−Te systems, is supported by later works, 5,6,8,15−18 although some authors recognize other different phases.…”

“…Brown and Lewis proposed a wide range of Bi 2 Te 3 stable compositions, while Abrikosov and Bankina proposed the existence of other compositions. The Bi–Te system has been studied by different methods, and today, many authors ,, recognize the phase diagram reported by Okamoto et al…”

“…Bi 2 Te 3 has been studied for decades as one of the most important thermoelectric materials, , and recently, its properties as a topological insulator (TI) have been experimentally demonstrated. , However, other Bi–Te phases that have received much less attention do exist. − In fact, there are at least seven different crystal structures in the Bi–Te system. They have a layered structure (with the exception of Bi 4 Te 3 ) and present a rhombohedral or trigonal symmetry that is most frequently represented using hexagonal lattices with very similar a values (∼0.44 nm) and with c varying between 1 and 15 nm. , …”

Enhancing the thermoelectric performance of free solidified p-type Bi0.5Sb1.5Te3 alloy by manipulating its parent liquid state

“…By means of internal friction [22], liquid X-ray diffraction [23], neutron diffraction and small-angle neutron scattering [24], viscosity [25], density and sound velocity [26], as well as computer simulations [27] etc., lots of research groups found and convinced a new physical phenomenon: temperature induced liquid liquid structural transition (TI-LLST) occurred in some single or multiple component melts well above their liquidus. More significantly, it was found the solidification structures and some relevant properties indeed changed when solidified out of the melts after experiencing TI-LLST [28]. Therefore, it is logical to believe that the solidified microstructures and properties of TE materials will be altered by triggering TI-LLST, which will influence electron and phonon transport behaviors, subsequently affecting the TE properties.…”