Ba2MgSmSbO6 crystallizes in the orthorhombic Immm space group. Ba(1) is bonded in a 9-coordinate geometry to one Mg(1), four equivalent O(1), and four equivalent O(2) atoms. Mg(1) is bonded in a square co-planar geometry to two equivalent Ba(1) and four equivalent O(1) atoms. Sm(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form SmO6 octahedra that share corners with six equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-9°. Sb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form SbO6 octahedra that share corners with six equivalent Sm(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-9°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Mg(1), one Sm(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Sm(1), and one Sb(1) atom.
Ba2MgSmSbO6 crystallizes in the orthorhombic Immm space group. Ba(1) is bonded in a 9-coordinate geometry to one Mg(1), four equivalent O(1), and four equivalent O(2) atoms. The Ba(1)-Mg(1) bond length is 3.06 Å. All Ba(1)-O(1) bond lengths are 3.06 Å. There are two shorter (3.18 Å) and two longer (3.21 Å) Ba(1)-O(2) bond lengths. Mg(1) is bonded in a square co-planar geometry to two equivalent Ba(1) and four equivalent O(1) atoms. All Mg(1)-O(1) bond lengths are 2.05 Å. Sm(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form SmO6 octahedra that share corners with six equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-9°. Both Sm(1)-O(2) bond lengths are 2.45 Å. All Sm(1)-O(1) bond lengths are 2.25 Å. Sb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form SbO6 octahedra that share corners with six equivalent Sm(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-9°. Both Sb(1)-O(2) bond lengths are 2.53 Å. All Sb(1)-O(1) bond lengths are 2.21 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Mg(1), one Sm(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Sm(1), and one Sb(1) atom.