SrMn(II) (2)Mn(III)(PO(4))(3)

The title compound, strontium trimanganese tris­(ortho­phosphate), was synthesized under hydro­thermal conditions. Its structure is isotypic to that of the lead analogue PbMn(II) (2)Mn(III)(PO(4))(3). Two O atoms are in general positions, whereas all others atoms are in special positions. The Sr and one P atom exhibit mm2 symmetry, the Mn(II) atom 2/m symmetry, the Mn(III) atom and the other P atom .2. symmetry and two O atoms are located on mirror planes. The three-dimensional network of the crystal structure is made up of two types of chains running parallel to [010]. One chain is linear and is composed of alternating Mn(III)O(6) octa­hedra and PO(4) tetra­hedra sharing vertices; the other chain has a zigzag arrangement and is built up from two edge-sharing Mn(II)O(6) octa­hedra connected to PO(4) tetra­hedra by edges and vertices. The two types of chains are linked through PO(4) tetra­hedra, leading to the formation of channels parallel to [100] and [010] in which the Sr(II) ions are located. They are surrounded by eight O atoms in the form of a slightly distorted bicapped trigonal prism.