Kristallstrukturuntersuchungen an ZnCl21

Abstract

According to former investigations ZnCl₂ should form the CdCl₂-(C 19-) structure; therefore Zn should be surrounded by six chlorines. An examination showed that neither the powder diagram of ZnCl₂ as given in the literature nor the diagrams of ZnCl₂ which we produced are compatible with the C 19-type.

Three modifications of ZnCl₂ which we named α-, β- and γ-ZnCl₂ have been synthezised: α-ZnCl₂: I[unk]2d−D_2d¹², a = 5.40 Å, c = 10.35 Å, Z = 4; β-ZnCl₂: P2₁/n−C_2h⁵, a = 6.54 Å, b = 11.31 Å, c = 12.33 Å, β = 90°, Z = 12; γ-ZnCl₂: P4₂/nmc−D_4h¹⁵, a = 3.70 Å, c = 10.67 Å, Z = 2.

The crystal structures of these modifications have been determined. In all structures Zn is tetrahedrally surrounded by four chlorines, α- and β-ZnCl₂ form new structure types, and γ-ZnCl₂ belongs to the HgI₂-(C 13-)type.

Published Online: 2010-07-28

Published in Print: 1961-10