KZn2(PO4)2 crystallizes in the triclinic P-1 space group. K(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom to form distorted KO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent Zn(1)O4 tetrahedra, corners with three equivalent Zn(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(5), one O(7), and one O(8) atom to form ZnO4 tetrahedra that share corners with two equivalent K(1)O6 octahedra,  a cornercorner with one Zn(2)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 58-72°. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form ZnO4 tetrahedra that share corners with three equivalent K(1)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 63-67°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent K(1)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-65°. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one K(1)O6 octahedra, corners with two equivalent Zn(2)O4 tetrahedra, corners with three equivalent Zn(1)O4 tetrahedra, and  an edgeedge with one K(1)O6 octahedra. The corner-sharing octahedral tilt angles are 70°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one P(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one K(1), one Zn(2), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Zn(2), and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Zn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one K(1), one Zn(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one K(1), one Zn(1), and one P(2) atom.
KZn2(PO4)2 crystallizes in the triclinic P-1 space group. K(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom to form distorted KO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent Zn(1)O4 tetrahedra, corners with three equivalent Zn(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The K(1)-O(2) bond length is 2.80 Å. The K(1)-O(3) bond length is 2.85 Å. The K(1)-O(4) bond length is 2.69 Å. The K(1)-O(5) bond length is 3.02 Å. The K(1)-O(6) bond length is 2.79 Å. The K(1)-O(8) bond length is 2.77 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(5), one O(7), and one O(8) atom to form ZnO4 tetrahedra that share corners with two equivalent K(1)O6 octahedra,  a cornercorner with one Zn(2)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 58-72°. The Zn(1)-O(1) bond length is 2.07 Å. The Zn(1)-O(5) bond length is 1.95 Å. The Zn(1)-O(7) bond length is 1.96 Å. The Zn(1)-O(8) bond length is 1.94 Å. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form ZnO4 tetrahedra that share corners with three equivalent K(1)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 63-67°. The Zn(2)-O(1) bond length is 1.98 Å. The Zn(2)-O(2) bond length is 1.96 Å. The Zn(2)-O(3) bond length is 1.93 Å. The Zn(2)-O(6) bond length is 1.98 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent K(1)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-65°. The P(1)-O(2) bond length is 1.55 Å. The P(1)-O(4) bond length is 1.54 Å. The P(1)-O(6) bond length is 1.57 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(3), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one K(1)O6 octahedra, corners with two equivalent Zn(2)O4 tetrahedra, corners with three equivalent Zn(1)O4 tetrahedra, and  an edgeedge with one K(1)O6 octahedra. The corner-sharing octahedral tilt angles are 70°. The P(2)-O(1) bond length is 1.59 Å. The P(2)-O(3) bond length is 1.54 Å. The P(2)-O(5) bond length is 1.54 Å. The P(2)-O(8) bond length is 1.55 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one P(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one K(1), one Zn(2), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Zn(2), and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Zn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one K(1), one Zn(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one K(1), one Zn(1), and one P(2) atom.