Single crystal growth of CaMg2(SO4)3 via solid- / gas-phase reactions and its Nasicon-related crystal structure by Matthias Weil

Crystal Research and Technology

Cryst. Res. Technol. 42, 1058 (2007) - Abstract -

Single crystal growth of CaMg₂(SO₄)₃ via solid- / gas-phase reactions and its Nasicon-related crystal structure

Matthias Weil

Institute for Chemical Technologies and Analytics, Department of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria

Keywords	sulfates, solid- /gas-phase reactions, structure elucidation, X-ray diffraction
PACS	61.10.Nz, 61.66.Fn
DOI	10.1002/crat.200710975

Crystals of the double sulfate CaMg₂(SO₄)₃ have been obtained by solid-state reactions of stoichiometric amounts of anhydrous CaSO₄ and MgSO₄ in sealed and evacuated silica tubes with chlorine gas as mineraliser. The crystal structure was determined from single crystal X-ray diffractometer data and consists of distorted [CaO₆] octahedra (-3 symmetry), [MgO₆] octahedra (3 symmetry) and SO₄ tetrahedra (m symmetry) as single building units. Although the compound crystallizes in a new structure type, it is topologically related to the NaZr₂(PO₄)₃ (Nasicon) structure, and a comparative discussion between both structural arrangements is given.

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