SrMgMnO3 crystallizes in the monoclinic Cm space group. Sr(1) is bonded in a 3-coordinate geometry to one O(2) and two equivalent O(1) atoms. Mg(1) is bonded in a trigonal non-coplanar geometry to one O(2) and two equivalent O(1) atoms. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 10°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), and two equivalent Mn(1) atoms.
SrMgMnO3 crystallizes in the monoclinic Cm space group. Sr(1) is bonded in a 3-coordinate geometry to one O(2) and two equivalent O(1) atoms. The Sr(1)-O(2) bond length is 2.44 Å. Both Sr(1)-O(1) bond lengths are 2.46 Å. Mg(1) is bonded in a trigonal non-coplanar geometry to one O(2) and two equivalent O(1) atoms. The Mg(1)-O(2) bond length is 1.90 Å. Both Mg(1)-O(1) bond lengths are 1.91 Å. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 10°. There is one shorter (2.12 Å) and one longer (2.52 Å) Mn(1)-O(2) bond length. There are two shorter (2.12 Å) and two longer (2.46 Å) Mn(1)-O(1) bond lengths. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), and two equivalent Mn(1) atoms.