CdSrP2O7 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(6), two equivalent O(4), and two equivalent O(7) atoms. Cd(1) is bonded to one O(1), one O(2), one O(3), one O(6), and one O(7) atom to form distorted CdO5 square pyramids that share corners with two equivalent P(2)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form PO4 tetrahedra that share corners with three equivalent Cd(1)O5 square pyramids and  a cornercorner with one P(2)O4 tetrahedra. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Cd(1)O5 square pyramids and  a cornercorner with one P(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Cd(1), and one P(2) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to two equivalent Sr(1), one Cd(1), and one P(2) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Cd(1), and one P(1) atom. In the fifth O site, O(2) is bonded in a distorted trigonal planar geometry to one Sr(1), one Cd(1), and one P(1) atom. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Cd(1), and one P(1) atom. In the seventh O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Sr(1) and one P(2) atom.
CdSrP2O7 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(6), two equivalent O(4), and two equivalent O(7) atoms. The Sr(1)-O(1) bond length is 2.65 Å. The Sr(1)-O(2) bond length is 2.73 Å. The Sr(1)-O(3) bond length is 2.65 Å. The Sr(1)-O(6) bond length is 2.61 Å. There is one shorter (2.62 Å) and one longer (2.65 Å) Sr(1)-O(4) bond length. There is one shorter (2.57 Å) and one longer (2.90 Å) Sr(1)-O(7) bond length. Cd(1) is bonded to one O(1), one O(2), one O(3), one O(6), and one O(7) atom to form distorted CdO5 square pyramids that share corners with two equivalent P(2)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. The Cd(1)-O(1) bond length is 2.29 Å. The Cd(1)-O(2) bond length is 2.27 Å. The Cd(1)-O(3) bond length is 2.30 Å. The Cd(1)-O(6) bond length is 2.23 Å. The Cd(1)-O(7) bond length is 2.38 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form PO4 tetrahedra that share corners with three equivalent Cd(1)O5 square pyramids and  a cornercorner with one P(2)O4 tetrahedra. The P(1)-O(1) bond length is 1.55 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.53 Å. The P(1)-O(5) bond length is 1.62 Å. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Cd(1)O5 square pyramids and  a cornercorner with one P(1)O4 tetrahedra. The P(2)-O(4) bond length is 1.53 Å. The P(2)-O(5) bond length is 1.63 Å. The P(2)-O(6) bond length is 1.53 Å. The P(2)-O(7) bond length is 1.54 Å. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Cd(1), and one P(2) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to two equivalent Sr(1), one Cd(1), and one P(2) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Cd(1), and one P(1) atom. In the fifth O site, O(2) is bonded in a distorted trigonal planar geometry to one Sr(1), one Cd(1), and one P(1) atom. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Cd(1), and one P(1) atom. In the seventh O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Sr(1) and one P(2) atom.