“…Bi 5 Br 4 is the bismuth‐richest compound among the bismuth subhalides containing isolated polycations (Bi 6 Br 7 , Bi 6 Cl 7 ,, Bi 7 Cl 10 ). Only subhalides with infinite ribbons of bismuth atoms (BiBr = Bi 4 Br 4 , BiI = Bi 4 I 4 ,, Bi 14 I 4 ,, Bi 16 I 4 ,, Bi 18 I 4 , ) can have similar or even higher bismuth content. In the bismuth‐bromine phase diagram, Bi 5 Br 4 is now the bismuth‐richest known binary phase (Figure ).…”