Acta Cryst. (2013). E69, i75 [ doi:10.1107/S1600536813027256 ]
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 . The Na and Cd atoms occupy one half of the octahedral voids in alternate layers stacked along , and one eighth of the tetrahedral voids are occupied by As atoms.
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