Materials Data on K3NaFeCl6 by Materials Project
K3NaFeCl6 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. K1+ is bonded in a distorted hexagonal planar geometry to six equivalent Cl1- atoms. There are two shorter (3.13 Å) and four longer (3.24 Å) K–Cl bond lengths. Na1+ is bonded to six equivalent Cl1- atoms to form distorted NaCl6 octahedra that share faces with two equivalent FeCl6 octahedra. All Na–Cl bond lengths are 2.84 Å. Fe2+ is bonded to six equivalent Cl1- atoms to form FeCl6 octahedra that share faces with two equivalent NaCl6 octahedra. All Fe–Cl bond lengths are 2.52 Å. Cl1- is bonded to three equivalent K1+, one Na1+, and one Fe2+ atom to form a mixture of distorted face and corner-sharing ClK3NaFe square pyramids.