K4P3 crystallizes in the orthorhombic Cmcm space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent P(2) and four equivalent P(1) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to three equivalent P(2) and four equivalent P(1) atoms. In the third K site, K(3) is bonded in a square co-planar geometry to four equivalent P(1) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent K(2), two equivalent K(3), four equivalent K(1), and one P(2) atom. In the second P site, P(2) is bonded in a 9-coordinate geometry to three equivalent K(2), four equivalent K(1), and two equivalent P(1) atoms.
K4P3 crystallizes in the orthorhombic Cmcm space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent P(2) and four equivalent P(1) atoms. Both K(1)-P(2) bond lengths are 3.41 Å. There are a spread of K(1)-P(1) bond distances ranging from 3.32-3.63 Å. In the second K site, K(2) is bonded in a 7-coordinate geometry to three equivalent P(2) and four equivalent P(1) atoms. There are two shorter (3.33 Å) and one longer (3.46 Å) K(2)-P(2) bond length. All K(2)-P(1) bond lengths are 3.30 Å. In the third K site, K(3) is bonded in a square co-planar geometry to four equivalent P(1) atoms. All K(3)-P(1) bond lengths are 3.36 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent K(2), two equivalent K(3), four equivalent K(1), and one P(2) atom. The P(1)-P(2) bond length is 2.17 Å. In the second P site, P(2) is bonded in a 9-coordinate geometry to three equivalent K(2), four equivalent K(1), and two equivalent P(1) atoms.