Ca2SnSbO6 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(3), one O(4), two equivalent O(2), and four equivalent O(1) atoms. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(3), one O(4), two equivalent O(1), and four equivalent O(2) atoms. Sn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with two equivalent Sn(1)O6 octahedra and corners with four equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-37°. Sb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra and corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-35°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Ca(2), two equivalent Ca(1), one Sn(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ca(1), two equivalent Ca(2), one Sn(1), and one Sb(1) atom. In the third O site, O(3) is bonded to one Ca(1), one Ca(2), and two equivalent Sb(1) atoms to form distorted OCa2Sb2 tetrahedra that share corners with two equivalent O(3)Ca2Sb2 tetrahedra and corners with two equivalent O(4)Ca2Sn2 tetrahedra. In the fourth O site, O(4) is bonded to one Ca(1), one Ca(2), and two equivalent Sn(1) atoms to form distorted OCa2Sn2 tetrahedra that share corners with two equivalent O(3)Ca2Sb2 tetrahedra and corners with two equivalent O(4)Ca2Sn2 tetrahedra.
Ca2SnSbO6 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(3), one O(4), two equivalent O(2), and four equivalent O(1) atoms. The Ca(1)-O(3) bond length is 2.39 Å. The Ca(1)-O(4) bond length is 2.42 Å. Both Ca(1)-O(2) bond lengths are 2.68 Å. There are two shorter (2.38 Å) and two longer (2.87 Å) Ca(1)-O(1) bond lengths. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(3), one O(4), two equivalent O(1), and four equivalent O(2) atoms. The Ca(2)-O(3) bond length is 2.48 Å. The Ca(2)-O(4) bond length is 2.33 Å. Both Ca(2)-O(1) bond lengths are 2.71 Å. There are two shorter (2.37 Å) and two longer (2.88 Å) Ca(2)-O(2) bond lengths. Sn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with two equivalent Sn(1)O6 octahedra and corners with four equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-37°. Both Sn(1)-O(1) bond lengths are 2.11 Å. Both Sn(1)-O(2) bond lengths are 2.10 Å. Both Sn(1)-O(4) bond lengths are 2.13 Å. Sb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra and corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-35°. Both Sb(1)-O(1) bond lengths are 2.14 Å. Both Sb(1)-O(2) bond lengths are 2.13 Å. Both Sb(1)-O(3) bond lengths are 2.11 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Ca(2), two equivalent Ca(1), one Sn(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Ca(1), two equivalent Ca(2), one Sn(1), and one Sb(1) atom. In the third O site, O(3) is bonded to one Ca(1), one Ca(2), and two equivalent Sb(1) atoms to form distorted OCa2Sb2 tetrahedra that share corners with two equivalent O(3)Ca2Sb2 tetrahedra and corners with two equivalent O(4)Ca2Sn2 tetrahedra. In the fourth O site, O(4) is bonded to one Ca(1), one Ca(2), and two equivalent Sn(1) atoms to form distorted OCa2Sn2 tetrahedra that share corners with two equivalent O(3)Ca2Sb2 tetrahedra and corners with two equivalent O(4)Ca2Sn2 tetrahedra.