K3PO5 crystallizes in the tetragonal I4/mcm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to two equivalent O(1) and eight equivalent O(2) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent O(1) and six equivalent O(2) atoms. P(1) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent K(1) and four equivalent K(2) atoms to form corner-sharing OK6 octahedra. The corner-sharing octahedral tilt angles range from 0-25°. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1), three equivalent K(2), and one P(1) atom.
K3PO5 crystallizes in the tetragonal I4/mcm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to two equivalent O(1) and eight equivalent O(2) atoms. Both K(1)-O(1) bond lengths are 2.84 Å. All K(1)-O(2) bond lengths are 3.10 Å. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent O(1) and six equivalent O(2) atoms. Both K(2)-O(1) bond lengths are 2.68 Å. There are two shorter (2.73 Å) and four longer (3.05 Å) K(2)-O(2) bond lengths. P(1) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. All P(1)-O(2) bond lengths are 1.56 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent K(1) and four equivalent K(2) atoms to form corner-sharing OK6 octahedra. The corner-sharing octahedral tilt angles range from 0-25°. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1), three equivalent K(2), and one P(1) atom.