CdSeO4 crystallizes in the orthorhombic Cmcm space group. Cd(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CdO6 octahedra that share corners with six equivalent Se(1)O4 tetrahedra and edges with two equivalent Cd(1)O6 octahedra. Se(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form SeO4 tetrahedra that share corners with six equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-56°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Cd(1) and one Se(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one Se(1) atom.
CdSeO4 crystallizes in the orthorhombic Cmcm space group. Cd(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form CdO6 octahedra that share corners with six equivalent Se(1)O4 tetrahedra and edges with two equivalent Cd(1)O6 octahedra. Both Cd(1)-O(2) bond lengths are 2.25 Å. All Cd(1)-O(1) bond lengths are 2.34 Å. Se(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form SeO4 tetrahedra that share corners with six equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-56°. Both Se(1)-O(1) bond lengths are 1.67 Å. Both Se(1)-O(2) bond lengths are 1.64 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Cd(1) and one Se(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one Se(1) atom.