Crystal structure of strontium perchlorate anhydrate, Sr(ClO 4 ) 2 , from laboratory powder X-ray diffraction data

Abstract

The crystal structure of strontium perchlorate anhydrate, Sr(ClO 4 ) 2 , was determined and refined from laboratory powder X-ray diffraction data. The material was obtained by dehydration of Sr(ClO 4 ) 2 3H 2 O at 523 K for two weeks. It crystallizes in the orthorhombic space group Pbca and is isotypic with Ca(AlD 4 ) 2 and Ca(ClO 4 ) 2 . The asymmetric unit contains one Sr, two Cl and eight O sites, all on general positions (Wyckoff position 8c). The crystal structure consists of Sr 2+ cations and isolated ClO4+ tetrahedra. The Sr 2+ cation is coordinated by eight O atoms from eight ClO4+ tetrahedra. The validity of the crystal structure model for Sr(ClO4)2 anhydrate was confirmed by the bond valence method. © 2019 International Union of Crystallography. All rights reserved.