Ba2MgMnO4 crystallizes in the tetragonal I-4m2 space group. Ba(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Mg(1) is bonded to four equivalent O(2) atoms to form corner-sharing MgO4 tetrahedra. Mn(1) is bonded to four equivalent O(1) atoms to form corner-sharing MnO4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1) and two equivalent Mn(1) atoms to form corner-sharing OBa2Mn2 tetrahedra. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to four equivalent Ba(1) and two equivalent Mg(1) atoms.
Ba2MgMnO4 crystallizes in the tetragonal I-4m2 space group. Ba(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Both Ba(1)-O(1) bond lengths are 2.49 Å. All Ba(1)-O(2) bond lengths are 2.92 Å. Mg(1) is bonded to four equivalent O(2) atoms to form corner-sharing MgO4 tetrahedra. All Mg(1)-O(2) bond lengths are 2.10 Å. Mn(1) is bonded to four equivalent O(1) atoms to form corner-sharing MnO4 tetrahedra. All Mn(1)-O(1) bond lengths are 2.07 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1) and two equivalent Mn(1) atoms to form corner-sharing OBa2Mn2 tetrahedra. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to four equivalent Ba(1) and two equivalent Mg(1) atoms.