Recently, asystematic reinvestigation on this Te-rich Bi0. 5 Sb1. 5 Te3alloy was performed by X. F. Tang’s group[45] . Theypropose the significantly enhanced ZT is ascribed to theanisotropic structure, where the charge and thermaltransport properties along and across two orthonormaldirections are distinctly different, rather than the midfrequency phonon scattering from dislocation networks.Figure 4 shows the electrical and thermal properties ofthe Te-rich Bi0. 5 Sb1. 5 Te3 alloys for both directions,where the maximum ZT is of 1. 24 at 350 K.