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In this work we determined the structure of Cs 2 ZnI 4  at 104 K. Lattice parameters at this temperature are  a  = 32.33(4) Å,  b  = 14.291(7) Å and  c  = 8.220(4) Å. With respect to the high temperature  Pnam  phase the  a  axis is triplicated and the symmetry is lowered to  Pna 2 1 . The structure is thus similar to the lock-in phases observed in other A 2 BX 4  compounds of  β -K 2 SeO 4  type.

Crystal structure and symmetry mode analysis of the threefold superstructure of Cs 2 ZnI 4 at 104 K