Mg2VSbO6 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(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 Mg site, Mg(2) is bonded in a distorted rectangular see-saw-like geometry to one O(3), one O(4), and four equivalent O(2) atoms. V(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra and corners with four equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-44°. 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 V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-47°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Mg(1), one V(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent Mg(2), one V(1), and one Sb(1) atom. In the third O site, O(3) is bonded to one Mg(1), one Mg(2), and two equivalent Sb(1) atoms to form distorted OMg2Sb2 tetrahedra that share corners with two equivalent O(3)Mg2Sb2 tetrahedra and corners with two equivalent O(4)Mg2V2 trigonal pyramids. In the fourth O site, O(4) is bonded to one Mg(1), one Mg(2), and two equivalent V(1) atoms to form distorted OMg2V2 trigonal pyramids that share corners with two equivalent O(3)Mg2Sb2 tetrahedra and corners with two equivalent O(4)Mg2V2 trigonal pyramids.
Mg2VSbO6 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(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 Mg(1)-O(3) bond length is 2.12 Å. The Mg(1)-O(4) bond length is 2.09 Å. Both Mg(1)-O(2) bond lengths are 2.47 Å. There are two shorter (2.10 Å) and two longer (2.72 Å) Mg(1)-O(1) bond lengths. In the second Mg site, Mg(2) is bonded in a distorted rectangular see-saw-like geometry to one O(3), one O(4), and four equivalent O(2) atoms. The Mg(2)-O(3) bond length is 2.21 Å. The Mg(2)-O(4) bond length is 2.01 Å. There are two shorter (2.05 Å) and two longer (2.70 Å) Mg(2)-O(2) bond lengths. V(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra and corners with four equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-44°. Both V(1)-O(1) bond lengths are 2.02 Å. Both V(1)-O(2) bond lengths are 2.10 Å. Both V(1)-O(4) bond lengths are 2.04 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 V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-47°. Both Sb(1)-O(1) bond lengths are 1.98 Å. Both Sb(1)-O(2) bond lengths are 1.98 Å. Both Sb(1)-O(3) bond lengths are 2.08 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Mg(1), one V(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent Mg(2), one V(1), and one Sb(1) atom. In the third O site, O(3) is bonded to one Mg(1), one Mg(2), and two equivalent Sb(1) atoms to form distorted OMg2Sb2 tetrahedra that share corners with two equivalent O(3)Mg2Sb2 tetrahedra and corners with two equivalent O(4)Mg2V2 trigonal pyramids. In the fourth O site, O(4) is bonded to one Mg(1), one Mg(2), and two equivalent V(1) atoms to form distorted OMg2V2 trigonal pyramids that share corners with two equivalent O(3)Mg2Sb2 tetrahedra and corners with two equivalent O(4)Mg2V2 trigonal pyramids.