Fig. 2: Crystal structures of 1.

Diagram of crystal structure packings in the a FEP at 300 K, b AFEP at 360 K and c paraelectric HTP at 390 K. The atoms with the probability of Ag and Bi of 50% are shown in brown. Hydrogen atoms are omitted for clarity. Green and magenta arrows represent the arrangement directions of CHMA+ cations and the possible displacement of Cs+ cations.