Sr2MgGaSbO6 crystallizes in the orthorhombic Immm space group. Sr(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 Sr(1) and four equivalent O(2) atoms. Ga(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form GaO6 octahedra that share corners with six equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Sb(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form SbO6 octahedra that share corners with six equivalent Ga(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(1), one Ga(1), and one Sb(1) atom to form distorted OSr4GaSb octahedra that share corners with six equivalent O(1)Sr4GaSb octahedra, corners with eight equivalent O(2)Sr2MgGaSb trigonal bipyramids, edges with four equivalent O(1)Sr4GaSb octahedra, and edges with eight equivalent O(2)Sr2MgGaSb trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-26°. In the second O site, O(2) is bonded to two equivalent Sr(1), one Mg(1), one Ga(1), and one Sb(1) atom to form distorted OSr2MgGaSb trigonal bipyramids that share corners with four equivalent O(1)Sr4GaSb octahedra, corners with three equivalent O(2)Sr2MgGaSb trigonal bipyramids, edges with four equivalent O(1)Sr4GaSb octahedra, edges with three equivalent O(2)Sr2MgGaSb trigonal bipyramids, and faces with two equivalent O(2)Sr2MgGaSb trigonal bipyramids. The corner-sharing octahedral tilt angles range from 45-51°.
Sr2MgGaSbO6 crystallizes in the orthorhombic Immm space group. Sr(1) is bonded in a 9-coordinate geometry to one Mg(1), four equivalent O(1), and four equivalent O(2) atoms. The Sr(1)-Mg(1) bond length is 3.06 Å. There are two shorter (2.95 Å) and two longer (3.02 Å) Sr(1)-O(1) bond lengths. All Sr(1)-O(2) bond lengths are 2.76 Å. Mg(1) is bonded in a square co-planar geometry to two equivalent Sr(1) and four equivalent O(2) atoms. All Mg(1)-O(2) bond lengths are 2.02 Å. Ga(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form GaO6 octahedra that share corners with six equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Both Ga(1)-O(1) bond lengths are 2.45 Å. All Ga(1)-O(2) bond lengths are 1.92 Å. Sb(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form SbO6 octahedra that share corners with six equivalent Ga(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Both Sb(1)-O(1) bond lengths are 2.39 Å. All Sb(1)-O(2) bond lengths are 2.20 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(1), one Ga(1), and one Sb(1) atom to form distorted OSr4GaSb octahedra that share corners with six equivalent O(1)Sr4GaSb octahedra, corners with eight equivalent O(2)Sr2MgGaSb trigonal bipyramids, edges with four equivalent O(1)Sr4GaSb octahedra, and edges with eight equivalent O(2)Sr2MgGaSb trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-26°. In the second O site, O(2) is bonded to two equivalent Sr(1), one Mg(1), one Ga(1), and one Sb(1) atom to form distorted OSr2MgGaSb trigonal bipyramids that share corners with four equivalent O(1)Sr4GaSb octahedra, corners with three equivalent O(2)Sr2MgGaSb trigonal bipyramids, edges with four equivalent O(1)Sr4GaSb octahedra, edges with three equivalent O(2)Sr2MgGaSb trigonal bipyramids, and faces with two equivalent O(2)Sr2MgGaSb trigonal bipyramids. The corner-sharing octahedral tilt angles range from 45-51°.