Structure cristalline de type alluaudite KNa(5)Mn(3)(MoO(4))(6)

The new phase potassium penta­sodium trimanganese hexa­kis(molybdate), KNa(5)Mn(3)Mo(6)O(24), has been synthesized using solid-state methods. The structure is composed of M (2)O(10) (M = Mn, Na) dimers and MoO(4) tetra­hedra (point group symmetry 2) sharing corners and forming layers parallel to (100), which are linked via common corners of another type of MO(4) tetra­hedra, forming a three-dimensional structure with two types of large channels along [001] in which two types of Na(+) cations (one with site symmetry 2, one with -1) and K(+) cations (site symmetry 2, half-occupation) are located. Mn(2+) and the third type of Na(+) cations are located at the same site M with occupancies of 0.75 and 0.25, respectively. A comparative structural description is provided between the structure of the title compound and those of the related phases Cu(1.35)Fe(3)(PO(4))(3) and NaAgFeMn(2)(PO(4))(3).