Formation of Dense Pore Structure by Te Addition in Bi_0.5Sb_1.5Te₃: An Approach to Minimize Lattice Thermal Conductivity

Figure 4

The scanning electron microscope (SEM) images of fractured surface for SPSed and vacuum-annealed (a) 2 and (b) 3 wt.% Te coated Bi_0.5Sb_1.5Te₃ samples.

(a)

(b)