Dipotassium Tristrontium Dimanganese Tris(diphosphate).

The structure of the title mixed trimetallic diphosphate, K2Sr3Mn2(P2O7)3, is constructed of a three-dimensional matrix composed of SrO8–10, MnO5 and PO4 polyhedra. The sharing of O atoms between these polyhedra creates tunnels of large dimensions parallel to (010), in which are found columns of K+ ions. Thus, the presence of several cations differing in size in the solid matrix leads to the formation of large tunnels and potential conductivity.