Zur Kenntnis der K4[Ag4O4]-Verwandtschaft

On the K₄[Ag₄O₄] Relation Single crystals of mainly new oxides A₄[M₄O₄] with M = Cu, A = Li? Rb and M = Ag, A = Na, Rb, Cs have been prepared by “reaction at the metallic substrate” (i.e. the wall) and the crystal structures were refined. For lattice constants and atomic parameters see text. The [M₄O₄]^4? ring is planar only for the M₄-part, the positions of the O^2? particles deviate in a non systematic way from this plane. Only Li₄[Cu₄O₄] contains an almost planar ring. The Madelung Part of Lattice Energy, MAPLE, Effective Coordination Numbers, ECoN, these via Mean Fictive Ionic Radii, MEFIR, are calculated.