Abstract
A sample of silver-chabazite, Ag 3.7Al 3.8Si 8.3O 24.10H 2O, was completely dehydrated at suitable conditions of vacuum and temperature (2 × 10 −6 Torr, 60°C). After dehydration, the symmetry of the Ag-CHA crystals was reduced from the usual rhombohedral space group R 3m to the monoclinic C2 m , with the following cell dimensions: a = 19.240(6) A ̊ , b = 13.771(4) A ̊ , c = 11.868(4) A ̊ , β = 113.28(3) A ̊ , Full matrix least-squares refinement reduced R index to 0.093 on the basis of 2305 reflections. The framework of d-Ag-CHA can be described as a tridimensional linkage of D6R units in alternate layers rotated about the monoclinic b-axis. The silver ions occupy eight independent positions, related to sites I, III and IV of the rhombohedral cell, near the centre of the 6-ring, at the centre (0, 1 2 1 2 ) of the D6R cage and near the 8-ring aperture, respectively. The positions and the populations of the cation sites of d-Ag-CHA are compared with those of h-Ag-CHA and related with the relevant variation of the framework.
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