SrZn2(AsO4)2 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted SrO7 hexagonal pyramids that share corners with two equivalent Zn(2)O4 tetrahedra, corners with two equivalent As(1)O4 tetrahedra, corners with three equivalent Zn(1)O4 tetrahedra, corners with three equivalent As(2)O4 tetrahedra,  an edgeedge with one Zn(2)O4 tetrahedra, and  an edgeedge with one As(1)O4 tetrahedra. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form ZnO4 tetrahedra that share corners with three equivalent Sr(1)O7 hexagonal pyramids,  a cornercorner with one As(2)O4 tetrahedra, and corners with three equivalent As(1)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(1), one O(4), one O(6), and one O(8) atom to form ZnO4 tetrahedra that share corners with two equivalent Sr(1)O7 hexagonal pyramids,  a cornercorner with one As(1)O4 tetrahedra, corners with three equivalent As(2)O4 tetrahedra, and  an edgeedge with one Sr(1)O7 hexagonal pyramid. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent Sr(1)O7 hexagonal pyramids,  a cornercorner with one Zn(2)O4 tetrahedra, corners with three equivalent Zn(1)O4 tetrahedra, and  an edgeedge with one Sr(1)O7 hexagonal pyramid. In the second As site, As(2) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form AsO4 tetrahedra that share corners with three equivalent Sr(1)O7 hexagonal pyramids,  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 trigonal planar geometry to one Sr(1), one Zn(2), and one As(2) atom. In the second O site, O(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(1), and one As(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 As(2) atom. In the fourth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Zn(1), and one As(1) atom. In the fifth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(2), and one As(2) atom. In the sixth O site, O(1) is bonded in a trigonal planar geometry to one Sr(1), one Zn(2), and one As(1) atom. In the seventh O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one As(2) atom. In the eighth O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(1), and one As(1) atom.
SrZn2(AsO4)2 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted SrO7 hexagonal pyramids that share corners with two equivalent Zn(2)O4 tetrahedra, corners with two equivalent As(1)O4 tetrahedra, corners with three equivalent Zn(1)O4 tetrahedra, corners with three equivalent As(2)O4 tetrahedra,  an edgeedge with one Zn(2)O4 tetrahedra, and  an edgeedge with one As(1)O4 tetrahedra. The Sr(1)-O(1) bond length is 2.67 Å. The Sr(1)-O(3) bond length is 2.66 Å. The Sr(1)-O(4) bond length is 2.58 Å. The Sr(1)-O(5) bond length is 2.62 Å. The Sr(1)-O(6) bond length is 2.61 Å. The Sr(1)-O(7) bond length is 2.79 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(2), one O(3), one O(5), and one O(7) atom to form ZnO4 tetrahedra that share corners with three equivalent Sr(1)O7 hexagonal pyramids,  a cornercorner with one As(2)O4 tetrahedra, and corners with three equivalent As(1)O4 tetrahedra. The Zn(1)-O(2) bond length is 1.94 Å. The Zn(1)-O(3) bond length is 2.00 Å. The Zn(1)-O(5) bond length is 1.98 Å. The Zn(1)-O(7) bond length is 1.99 Å. In the second Zn site, Zn(2) is bonded to one O(1), one O(4), one O(6), and one O(8) atom to form ZnO4 tetrahedra that share corners with two equivalent Sr(1)O7 hexagonal pyramids,  a cornercorner with one As(1)O4 tetrahedra, corners with three equivalent As(2)O4 tetrahedra, and  an edgeedge with one Sr(1)O7 hexagonal pyramid. The Zn(2)-O(1) bond length is 1.99 Å. The Zn(2)-O(4) bond length is 1.96 Å. The Zn(2)-O(6) bond length is 1.97 Å. The Zn(2)-O(8) bond length is 2.02 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent Sr(1)O7 hexagonal pyramids,  a cornercorner with one Zn(2)O4 tetrahedra, corners with three equivalent Zn(1)O4 tetrahedra, and  an edgeedge with one Sr(1)O7 hexagonal pyramid. The As(1)-O(1) bond length is 1.73 Å. The As(1)-O(3) bond length is 1.72 Å. The As(1)-O(5) bond length is 1.73 Å. The As(1)-O(7) bond length is 1.72 Å. In the second As site, As(2) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form AsO4 tetrahedra that share corners with three equivalent Sr(1)O7 hexagonal pyramids,  a cornercorner with one Zn(1)O4 tetrahedra, and corners with three equivalent Zn(2)O4 tetrahedra. The As(2)-O(2) bond length is 1.71 Å. The As(2)-O(4) bond length is 1.73 Å. The As(2)-O(6) bond length is 1.73 Å. The As(2)-O(8) bond length is 1.73 Å. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a trigonal planar geometry to one Sr(1), one Zn(2), and one As(2) atom. In the second O site, O(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(1), and one As(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 As(2) atom. In the fourth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Zn(1), and one As(1) atom. In the fifth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(2), and one As(2) atom. In the sixth O site, O(1) is bonded in a trigonal planar geometry to one Sr(1), one Zn(2), and one As(1) atom. In the seventh O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one As(2) atom. In the eighth O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(1), and one As(1) atom.