The Structure of Twinned Ag4Mn3O8, a Novel Octahedral Framework with a Topology Related to the Archetype Cubic {10, 3} Net

Preparative exploration of the system Ag—Mn—O under an elevated oxygen pressure yielded so far unknown Ag₄Mn₃O₈. Single crystal X‐ray investigations have revealed a trigonal crystal system, space group P3₁21 with lattice parameters a = 12.5919(1) and c = 15.4978(1)Å. Due to fourfold twinning a large cubic unit cell with a ≈ 26Å is simulated. The structure, which was refined as a fourfold twin, is composed of MnO₆ octahedra which are connected via common edges to a complex framework. The topology of this framework is closely related to the archetype cubic {10, 3} net. In the cavities of the framework the Ag⁺ ions are incorporated.