Sr3MgV2O7 crystallizes in the orthorhombic Immm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to two equivalent O(1), two equivalent O(2), and five equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded to two equivalent Mg(1) and four equivalent O(1) atoms to form distorted SrMg2O4 octahedra that share corners with two equivalent Sr(2)Mg2O4 octahedra, corners with eight equivalent V(1)O6 octahedra, and edges with two equivalent Sr(2)Mg2O4 octahedra. The corner-sharing octahedral tilt angles range from 0-85°. Mg(1) is bonded in a distorted square co-planar geometry to two equivalent Sr(2), two equivalent O(2), and two equivalent O(4) atoms. V(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form distorted VO6 octahedra that share corners with four equivalent Sr(2)Mg2O4 octahedra and corners with five equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-85°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent V(1) atoms to form a mixture of corner and edge-sharing OSr4V2 octahedra. The corner-sharing octahedral tilt angles range from 0-13°. In the second O site, O(2) is bonded in a distorted T-shaped geometry to two equivalent Sr(1), one Mg(1), and two equivalent V(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to five equivalent Sr(1) and one V(1) atom. In the fourth O site, O(4) is bonded in a square co-planar geometry to two equivalent Mg(1) and two equivalent V(1) atoms.
Sr3MgV2O7 crystallizes in the orthorhombic Immm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to two equivalent O(1), two equivalent O(2), and five equivalent O(3) atoms. Both Sr(1)-O(1) bond lengths are 2.59 Å. Both Sr(1)-O(2) bond lengths are 3.01 Å. There is one shorter (2.38 Å) and four longer (3.15 Å) Sr(1)-O(3) bond lengths. In the second Sr site, Sr(2) is bonded to two equivalent Mg(1) and four equivalent O(1) atoms to form distorted SrMg2O4 octahedra that share corners with two equivalent Sr(2)Mg2O4 octahedra, corners with eight equivalent V(1)O6 octahedra, and edges with two equivalent Sr(2)Mg2O4 octahedra. The corner-sharing octahedral tilt angles range from 0-85°. Both Sr(2)-Mg(1) bond lengths are 2.45 Å. All Sr(2)-O(1) bond lengths are 2.72 Å. Mg(1) is bonded in a distorted square co-planar geometry to two equivalent Sr(2), two equivalent O(2), and two equivalent O(4) atoms. Both Mg(1)-O(2) bond lengths are 1.89 Å. Both Mg(1)-O(4) bond lengths are 1.94 Å. V(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form distorted VO6 octahedra that share corners with four equivalent Sr(2)Mg2O4 octahedra and corners with five equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-85°. The V(1)-O(3) bond length is 1.86 Å. The V(1)-O(4) bond length is 2.20 Å. Both V(1)-O(1) bond lengths are 2.47 Å. Both V(1)-O(2) bond lengths are 1.97 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent V(1) atoms to form a mixture of corner and edge-sharing OSr4V2 octahedra. The corner-sharing octahedral tilt angles range from 0-13°. In the second O site, O(2) is bonded in a distorted T-shaped geometry to two equivalent Sr(1), one Mg(1), and two equivalent V(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to five equivalent Sr(1) and one V(1) atom. In the fourth O site, O(4) is bonded in a square co-planar geometry to two equivalent Mg(1) and two equivalent V(1) atoms.