Structure and crystallization behavior of the (Ba,Sr)HAsO4·H2O solid-solution in aqueous environments
-
Amalia Jiménez
,
Manuel Prieto
Abstract
Crystals of different members of the (Ba,Sr)HAsO4·H2O solid solution have been synthesized, and the first structural studies indicate that they crystallize in the same space group, Pbca, with Z = 8. The unit-cell parameters are a = 7.436(2), b = 8.481(1), c = 14.348(6) Å, and a = 7.752(1), b = 8.759(1), c = 14.668(3) Å for the strontium and barium end-members, respectively. Both end-members have a layered structure with slices parallel to (001) linked by hydrogen bonds from the water molecules. These features are consistent with both the perfect cleavage on {001} and the morphological importance of this form in the crystals obtained. However, the two end-members are not isostructural and show differences in both the anionic hydrogen positions and number of hydrogen bonds. Complementary powder-diffraction measurements indicate that the cell parameters increase in a non-linear way with the barium content indicating that the solid solution is complete but could be non-ideal. Preliminary data suggest that barium partitions preferentially into the solid phase when crystallizing this solid solution from aqueous solutions.
© 2015 by Walter de Gruyter Berlin/Boston
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