KZnB(PO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(7) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), two equivalent O(5), and two equivalent O(8) atoms. Zn(1) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form ZnO4 tetrahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. B(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form BO4 tetrahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra and corners with two equivalent B(1)O4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(2), one O(4), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra and corners with two equivalent B(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one K(2), one B(1), and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one K(1), one Zn(1), and one P(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one B(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one K(2), one Zn(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(2), one B(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one P(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent K(1), one Zn(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one K(2), one B(1), and one P(2) atom.
KZnB(PO4)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(7) atoms. Both K(1)-O(2) bond lengths are 2.88 Å. There are two shorter (2.77 Å) and two longer (2.88 Å) K(1)-O(7) bond lengths. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), two equivalent O(5), and two equivalent O(8) atoms. Both K(2)-O(1) bond lengths are 3.04 Å. Both K(2)-O(4) bond lengths are 2.84 Å. Both K(2)-O(5) bond lengths are 3.12 Å. Both K(2)-O(8) bond lengths are 2.88 Å. Zn(1) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form ZnO4 tetrahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. The Zn(1)-O(2) bond length is 1.98 Å. The Zn(1)-O(4) bond length is 1.95 Å. The Zn(1)-O(6) bond length is 1.95 Å. The Zn(1)-O(7) bond length is 1.98 Å. B(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form BO4 tetrahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. The B(1)-O(1) bond length is 1.48 Å. The B(1)-O(3) bond length is 1.46 Å. The B(1)-O(5) bond length is 1.49 Å. The B(1)-O(8) bond length is 1.48 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra and corners with two equivalent B(1)O4 tetrahedra. The P(1)-O(3) bond length is 1.57 Å. The P(1)-O(5) bond length is 1.57 Å. The P(1)-O(6) bond length is 1.52 Å. The P(1)-O(7) bond length is 1.53 Å. In the second P site, P(2) is bonded to one O(1), one O(2), one O(4), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra and corners with two equivalent B(1)O4 tetrahedra. The P(2)-O(1) bond length is 1.56 Å. The P(2)-O(2) bond length is 1.53 Å. The P(2)-O(4) bond length is 1.54 Å. The P(2)-O(8) bond length is 1.57 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one K(2), one B(1), and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one K(1), one Zn(1), and one P(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one B(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one K(2), one Zn(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(2), one B(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one P(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent K(1), one Zn(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one K(2), one B(1), and one P(2) atom.