K2AlF5 crystallizes in the tetragonal P4/mmm space group. K(1) is bonded in a 10-coordinate geometry to two equivalent F(2) and eight equivalent F(1) atoms. Al(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form corner-sharing AlF6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted single-bond geometry to four equivalent K(1) and one Al(1) atom. In the second F site, F(2) is bonded in a linear geometry to four equivalent K(1) and two equivalent Al(1) atoms.
K2AlF5 crystallizes in the tetragonal P4/mmm space group. K(1) is bonded in a 10-coordinate geometry to two equivalent F(2) and eight equivalent F(1) atoms. Both K(1)-F(2) bond lengths are 2.95 Å. All K(1)-F(1) bond lengths are 2.80 Å. Al(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form corner-sharing AlF6 octahedra. The corner-sharing octahedra are not tilted. Both Al(1)-F(2) bond lengths are 1.84 Å. All Al(1)-F(1) bond lengths are 1.79 Å. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted single-bond geometry to four equivalent K(1) and one Al(1) atom. In the second F site, F(2) is bonded in a linear geometry to four equivalent K(1) and two equivalent Al(1) atoms.