fig1

Figure 1. (A) The crystal structure of SnSb₂Te₄. The square frame shows a single SL building block. Blue, green, and magenta balls stand for Sn, Sb, and Te atoms. (B) The typical XRD patterns of SnSb₂Te₄ powders at ambient pressure. (C) The typical SEM image of the as-prepared SnSb₂Te₄ powders. (D) The typical EDX spectra of the as-prepared SnSb₂Te₄ powders.