Synthesis and crystal structure of Cs3ZnBr5

The compound Cs3ZnBr5 was synthesized from cesium and zinc bromides. The single crystals were grown by the Bridgman method. The structure of Cs3ZnBr5 was studied. The compound crystallizes in the tetragonal system with the unit cell parameters: a = b = 9.633(2) Å, c = 15.141(5) Å, V = 1404.8(6) Å3, Z = 4, space group I4/mcm; ρcalcd = 4.083 g/cm3, ρexp = 4.074 ± 0.001 g/cm3. The compound Cs3ZnBr5 is not hygroscopic and congruently melts at 530°C; it is transparent at 2.5 to 25 μm. The refractive indices are N p = 1.682, N g = 1.686. The microhardness is 560 MPa.