La2.50K1.50IrO7: An example of an n=2n=2 member of the [AnBn−1O3n ][A2′O] family of perovskite-related oxides

Single crystals of a new lanthanum potassium iridate, La2.50K1.50IrO7, have been grown from a molten hydroxide flux. The structure, which is best described as resulting from the stacking of [AO3] and mixed [A2O] layers, is an n=2n=2 member of the [AnBn−1O3n  ][A2′O] family of perovskite-related oxides. La2.50K1.50IrO7 is comprised of [La2IrO6] layers containing isolated [IrO6] octahedra and these layers are separated by a [La0.50K1.50O]+ layer. The compound crystallizes in the R3¯ space group with a=5.7330(2)Å and c=18.8328(9)Å

The crystal structure of n=2n=2 member, La2.50K1.50IrO7. The gray polyhedra are IrO6 octahedra, the black spheres are lanthanum atoms, the blue spheres are the La2/K2 atoms, and the orange spheres are oxygen atoms.Figure optionsDownload as PowerPoint slide