Ba2MgMnO4 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. Mg(1) is bonded in a linear geometry to two equivalent O(2) atoms. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ba(1) and two equivalent Mn(1) atoms to form a mixture of distorted edge, corner, and face-sharing OBa4Mn2 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Mg(1), and one Mn(1) atom.
Ba2MgMnO4 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. There are two shorter (2.76 Å) and two longer (2.78 Å) Ba(1)-O(1) bond lengths. There are a spread of Ba(1)-O(2) bond distances ranging from 2.93-2.96 Å. Mg(1) is bonded in a linear geometry to two equivalent O(2) atoms. Both Mg(1)-O(2) bond lengths are 1.88 Å. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedra are not tilted. Both Mn(1)-O(2) bond lengths are 2.61 Å. All Mn(1)-O(1) bond lengths are 2.02 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ba(1) and two equivalent Mn(1) atoms to form a mixture of distorted edge, corner, and face-sharing OBa4Mn2 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Mg(1), and one Mn(1) atom.