fig1

Pressure-induced superconductivity in hypercoordinated 5<i>p</i>-block element nitrides MN<sub>6</sub> (M = Sb, Te, I)

Figure 1. Crystal structure of 5p-block element nitrides MN6 (M = Sb, Te, I). (A) MN6 has $$ R\bar{3}m $$ space group; (B) Rhombohedral primitive cell structure without showing any M–N bonds, and the chair-like N6 hexazine ring is located in the center; (C) The hypercoordinated MN12 icosahedral cage. The large pink spheres and small yellow spheres represent the 5p-block elements and nitrogen, respectively.

Microstructures
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