Ca(SbO2)4 crystallizes in the trigonal R-3m space group. Ca(1) is bonded to six equivalent O(1) atoms to form CaO6 octahedra that share corners with six equivalent Sb(2)O6 octahedra and edges with six equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form SbO6 octahedra that share edges with two equivalent Ca(1)O6 octahedra, edges with two equivalent Sb(2)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. In the second Sb site, Sb(2) is bonded to six equivalent O(1) atoms to form SbO6 octahedra that share corners with six equivalent Ca(1)O6 octahedra and edges with six equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Sb(2), and two equivalent Sb(1) atoms. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to three equivalent Sb(1) atoms.
Ca(SbO2)4 crystallizes in the trigonal R-3m space group. Ca(1) is bonded to six equivalent O(1) atoms to form CaO6 octahedra that share corners with six equivalent Sb(2)O6 octahedra and edges with six equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. All Ca(1)-O(1) bond lengths are 2.48 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form SbO6 octahedra that share edges with two equivalent Ca(1)O6 octahedra, edges with two equivalent Sb(2)O6 octahedra, and edges with four equivalent Sb(1)O6 octahedra. Both Sb(1)-O(2) bond lengths are 2.21 Å. All Sb(1)-O(1) bond lengths are 2.24 Å. In the second Sb site, Sb(2) is bonded to six equivalent O(1) atoms to form SbO6 octahedra that share corners with six equivalent Ca(1)O6 octahedra and edges with six equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. All Sb(2)-O(1) bond lengths are 2.41 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Sb(2), and two equivalent Sb(1) atoms. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to three equivalent Sb(1) atoms.