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Cs 2 ZnI 4  belongs to the family of A 2 BX 4  compounds which at room temperature have a structure isomorphous to  β -K 2 SO 4 . At low temperatures it is known to undergo a sequence of phase transitions. The room temperature structure crystallizes in space group  Pnam  with lattice parameters  a  = 10.812(11) Å,  b  = 14.464(5) Å,  c  = 8.306(2) Å. The structure was refined to a final  R ( F ) value of 5.68% for 1104 reflections. As  β -K 2 SO 4  the structure is pseudohexagonal. The [ZnI 4 ] 2−  tetrahedra are only slightly distorted. Csl +  ions have nine nearest I −  neighbours, Cs2 +  have 11 nearest neighbours.

zeitschrift für kristallographie - crystalline materials

The crystal structure and crystal chemistry of Cs 2 ZnI 4  at room temperature including a comparison with the structure type of A 3 BX 5  (A = NH 4  + , Cs; B = Co, Zn, Hg; X = Cl, Br, I) compounds