BaCdP2O7 crystallizes in the triclinic P-1 space group. Ba(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(3), two equivalent O(4), two equivalent O(5), and three equivalent O(7) atoms. Cd(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form distorted CdO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra, corners with four equivalent P(1)O4 tetrahedra, and  an edgeedge with one Cd(1)O6 octahedra. 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(6) atom to form PO4 tetrahedra that share corners with four equivalent Cd(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-61°. 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)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 58-59°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ba(1), one Cd(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(1), one Cd(1), and one P(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Ba(1), two equivalent Cd(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to two equivalent Ba(1), one Cd(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Cd(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to three equivalent Ba(1) and one P(2) atom.
BaCdP2O7 crystallizes in the triclinic P-1 space group. Ba(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(3), two equivalent O(4), two equivalent O(5), and three equivalent O(7) atoms. The Ba(1)-O(1) bond length is 2.80 Å. The Ba(1)-O(2) bond length is 2.84 Å. The Ba(1)-O(3) bond length is 3.14 Å. There is one shorter (2.90 Å) and one longer (3.15 Å) Ba(1)-O(4) bond length. There is one shorter (2.78 Å) and one longer (2.92 Å) Ba(1)-O(5) bond length. There are a spread of Ba(1)-O(7) bond distances ranging from 2.69-3.15 Å. Cd(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form distorted CdO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra, corners with four equivalent P(1)O4 tetrahedra, and  an edgeedge with one Cd(1)O6 octahedra. The Cd(1)-O(1) bond length is 2.25 Å. The Cd(1)-O(2) bond length is 2.61 Å. The Cd(1)-O(4) bond length is 2.28 Å. The Cd(1)-O(5) bond length is 2.28 Å. There is one shorter (2.35 Å) and one longer (2.48 Å) Cd(1)-O(3) bond length. 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(6) atom to form PO4 tetrahedra that share corners with four equivalent Cd(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-61°. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(2) bond length is 1.51 Å. The P(1)-O(3) bond length is 1.56 Å. The P(1)-O(6) bond length is 1.64 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)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 58-59°. The P(2)-O(4) bond length is 1.54 Å. The P(2)-O(5) bond length is 1.55 Å. The P(2)-O(6) bond length is 1.62 Å. The P(2)-O(7) bond length is 1.52 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ba(1), one Cd(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(1), one Cd(1), and one P(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Ba(1), two equivalent Cd(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to two equivalent Ba(1), one Cd(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Cd(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to three equivalent Ba(1) and one P(2) atom.