SrZn2(PO4)2 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(3), one O(6), one O(7), and one O(8) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(2)O4 tetrahedra and corners with three equivalent Zn(1)O4 tetrahedra. In the second P site, P(2) is bonded to one O(2), one O(3), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and corners with three equivalent Zn(2)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(1), and one P(1) atom. In the second O site, O(5) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(1), and one P(1) atom. In the third O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(2), and one P(2) atom. In the fourth O site, O(7) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(2), and one P(2) atom. In the fifth O site, O(8) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(2), and one P(1) atom. In the sixth O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(1), and one P(1) atom. In the seventh O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(2) atom. In the eighth O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(2), and one P(2) atom.
SrZn2(PO4)2 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. The Sr(1)-O(1) bond length is 2.61 Å. The Sr(1)-O(3) bond length is 2.68 Å. The Sr(1)-O(4) bond length is 2.66 Å. The Sr(1)-O(5) bond length is 2.74 Å. The Sr(1)-O(6) bond length is 2.60 Å. The Sr(1)-O(7) bond length is 2.56 Å. The Sr(1)-O(8) bond length is 2.65 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. The Zn(1)-O(1) bond length is 1.98 Å. The Zn(1)-O(2) bond length is 1.93 Å. The Zn(1)-O(4) bond length is 2.00 Å. The Zn(1)-O(5) bond length is 1.98 Å. In the second Zn site, Zn(2) is bonded to one O(3), one O(6), one O(7), and one O(8) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. The Zn(2)-O(3) bond length is 2.01 Å. The Zn(2)-O(6) bond length is 1.97 Å. The Zn(2)-O(7) bond length is 1.95 Å. The Zn(2)-O(8) bond length is 1.99 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(2)O4 tetrahedra and corners with three equivalent Zn(1)O4 tetrahedra. The P(1)-O(1) bond length is 1.56 Å. The P(1)-O(4) bond length is 1.55 Å. The P(1)-O(5) bond length is 1.55 Å. The P(1)-O(8) bond length is 1.56 Å. In the second P site, P(2) is bonded to one O(2), one O(3), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and corners with three equivalent Zn(2)O4 tetrahedra. The P(2)-O(2) bond length is 1.54 Å. The P(2)-O(3) bond length is 1.56 Å. The P(2)-O(6) bond length is 1.57 Å. The P(2)-O(7) bond length is 1.56 Å. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(1), and one P(1) atom. In the second O site, O(5) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(1), and one P(1) atom. In the third O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(2), and one P(2) atom. In the fourth O site, O(7) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(2), and one P(2) atom. In the fifth O site, O(8) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(2), and one P(1) atom. In the sixth O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(1), and one P(1) atom. In the seventh O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(2) atom. In the eighth O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(2), and one P(2) atom.