K2NaBP2 crystallizes in the monoclinic C2/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 4-coordinate geometry to two equivalent B(2) and two equivalent P(2) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent B(1), one P(1), and three equivalent P(2) atoms. Na(1) is bonded to one P(2) and three equivalent P(1) atoms to form NaP4 tetrahedra that share  a cornercorner with one B(1)K4P2 octahedra, corners with three equivalent B(2)K4P2 octahedra, corners with two equivalent Na(1)P4 tetrahedra, and edges with two equivalent Na(1)P4 tetrahedra. The corner-sharing octahedral tilt angles range from 60-82°. There are two inequivalent B sites. In the first B site, B(1) is bonded to four equivalent K(2) and two equivalent P(2) atoms to form distorted BK4P2 octahedra that share corners with two equivalent Na(1)P4 tetrahedra and edges with two equivalent B(1)K4P2 octahedra. In the second B site, B(2) is bonded to four equivalent K(1) and two equivalent P(1) atoms to form distorted BK4P2 octahedra that share corners with six equivalent Na(1)P4 tetrahedra and edges with two equivalent B(2)K4P2 octahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 5-coordinate geometry to one K(2), three equivalent Na(1), and one B(2) atom. In the second P site, P(2) is bonded in a 7-coordinate geometry to two equivalent K(1), three equivalent K(2), one Na(1), and one B(1) atom.
K2NaBP2 crystallizes in the monoclinic C2/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 4-coordinate geometry to two equivalent B(2) and two equivalent P(2) atoms. Both K(1)-B(2) bond lengths are 3.26 Å. Both K(1)-P(2) bond lengths are 3.38 Å. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent B(1), one P(1), and three equivalent P(2) atoms. Both K(2)-B(1) bond lengths are 3.16 Å. The K(2)-P(1) bond length is 3.34 Å. There are two shorter (3.41 Å) and one longer (3.46 Å) K(2)-P(2) bond length. Na(1) is bonded to one P(2) and three equivalent P(1) atoms to form NaP4 tetrahedra that share  a cornercorner with one B(1)K4P2 octahedra, corners with three equivalent B(2)K4P2 octahedra, corners with two equivalent Na(1)P4 tetrahedra, and edges with two equivalent Na(1)P4 tetrahedra. The corner-sharing octahedral tilt angles range from 60-82°. The Na(1)-P(2) bond length is 2.91 Å. There are two shorter (2.91 Å) and one longer (2.97 Å) Na(1)-P(1) bond length. There are two inequivalent B sites. In the first B site, B(1) is bonded to four equivalent K(2) and two equivalent P(2) atoms to form distorted BK4P2 octahedra that share corners with two equivalent Na(1)P4 tetrahedra and edges with two equivalent B(1)K4P2 octahedra. Both B(1)-P(2) bond lengths are 1.78 Å. In the second B site, B(2) is bonded to four equivalent K(1) and two equivalent P(1) atoms to form distorted BK4P2 octahedra that share corners with six equivalent Na(1)P4 tetrahedra and edges with two equivalent B(2)K4P2 octahedra. Both B(2)-P(1) bond lengths are 1.78 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 5-coordinate geometry to one K(2), three equivalent Na(1), and one B(2) atom. In the second P site, P(2) is bonded in a 7-coordinate geometry to two equivalent K(1), three equivalent K(2), one Na(1), and one B(1) atom.