Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 11 (November 2013)


inorganic compounds



Acta Cryst. (2013). E69, i75    [ doi:10.1107/S1600536813027256 ]

Olivine-type NaCd(AsO4)

M. Weil

Abstract: The title compound, sodium cadmium orthoarsenate, adopts the olivine [Mg2(SiO4)] structure type in space group Pnma, with Na (site symmetry -1) and Cd (.m.) replacing the two Mg positions, and the AsO4 tetra­hedron (.m.) the SiO4 tetra­hedron. The crystal structure is made up of a nearly hexa­gonal closed-packed arrangement of O atoms stacked along [001]. The Na and Cd atoms occupy one half of the octa­hedral voids in alternate layers stacked along [100], and one eighth of the tetra­hedral voids are occupied by As atoms.


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