Synthèse, étude et validation structurale d’un triple bis-molybdate en couches, Ag(0.60)Na(0.40)Fe(MoO(4))(2) lié à yavapaiite

The title compound, Ag(0.60)Na(0.40)Fe(MoO(4))(2) {silver sodium iron(III) bis­[molyb­date(VI)]}, was synthesized by a solid-state reaction. The structure is built up from FeO(6) octa­hedra and MoO(4) tetra­hedra sharing corners to form a two-dimensional framework parallel to the (001) plane. The occupationally disordered (Ag/Na)(+) cations are located in the inter­layer space. These [Fe(MoO(4))(2) (−)](n) layers are similar to those in the isotypic yavapaiite-related structure of NaFe(MoO(4))(2). All atoms are on general positions except for Fe (site symmetry -1) and Ag/Na (site symmetry 2). The Ag/Na occupancies of the latter site were refined to 0.597 (4):0.403 (5). The title structure is compared to similar structures.