BaCdAs2O7 crystallizes in the triclinic P-1 space group. Ba(1) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(6), one O(7), two equivalent O(4), and three equivalent O(2) atoms. Cd(1) is bonded to one O(1), one O(4), one O(6), one O(7), and two equivalent O(5) atoms to form CdO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with four equivalent As(2)O4 tetrahedra, and  an edgeedge with one Cd(1)O6 octahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 60-62°. In the second As site, As(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form AsO4 tetrahedra that share corners with four equivalent Cd(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-62°. 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 As(2) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to three equivalent Ba(1) and one As(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Cd(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ba(1), two equivalent Cd(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ba(1), one Cd(1), and one As(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ba(1), one Cd(1), and one As(1) atom.
BaCdAs2O7 crystallizes in the triclinic P-1 space group. Ba(1) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(6), one O(7), two equivalent O(4), and three equivalent O(2) atoms. The Ba(1)-O(1) bond length is 2.81 Å. The Ba(1)-O(5) bond length is 2.97 Å. The Ba(1)-O(6) bond length is 2.83 Å. The Ba(1)-O(7) bond length is 2.91 Å. There is one shorter (2.73 Å) and one longer (3.05 Å) Ba(1)-O(4) bond length. There are a spread of Ba(1)-O(2) bond distances ranging from 2.71-3.11 Å. Cd(1) is bonded to one O(1), one O(4), one O(6), one O(7), and two equivalent O(5) atoms to form CdO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with four equivalent As(2)O4 tetrahedra, and  an edgeedge with one Cd(1)O6 octahedra. The Cd(1)-O(1) bond length is 2.26 Å. The Cd(1)-O(4) bond length is 2.30 Å. The Cd(1)-O(6) bond length is 2.53 Å. The Cd(1)-O(7) bond length is 2.27 Å. There is one shorter (2.36 Å) and one longer (2.56 Å) Cd(1)-O(5) bond length. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 60-62°. The As(1)-O(2) bond length is 1.70 Å. The As(1)-O(3) bond length is 1.80 Å. The As(1)-O(4) bond length is 1.72 Å. The As(1)-O(7) bond length is 1.70 Å. In the second As site, As(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form AsO4 tetrahedra that share corners with four equivalent Cd(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-62°. The As(2)-O(1) bond length is 1.71 Å. The As(2)-O(3) bond length is 1.80 Å. The As(2)-O(5) bond length is 1.74 Å. The As(2)-O(6) bond length is 1.69 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 As(2) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to three equivalent Ba(1) and one As(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Cd(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ba(1), two equivalent Cd(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ba(1), one Cd(1), and one As(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ba(1), one Cd(1), and one As(1) atom.