BaMgNd2Mn2O7 crystallizes in the orthorhombic Immm space group. Ba(1) is bonded to two equivalent Mg(1) and four equivalent O(2) atoms to form distorted BaMg2O4 octahedra that share corners with two equivalent Ba(1)Mg2O4 octahedra, corners with eight equivalent Mn(1)O6 octahedra, and edges with two equivalent Ba(1)Mg2O4 octahedra. The corner-sharing octahedral tilt angles range from 0-89°. Mg(1) is bonded in a square co-planar geometry to two equivalent Ba(1), two equivalent O(1), and two equivalent O(4) atoms. Nd(1) is bonded in a distorted trigonal planar geometry to one O(3) and two equivalent O(2) atoms. Mn(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form MnO6 octahedra that share corners with four equivalent Ba(1)Mg2O4 octahedra and corners with five equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-89°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1) and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Nd(1), and two equivalent Mn(1) atoms to form a mixture of edge and corner-sharing OBa2Nd2Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the third O site, O(3) is bonded in a linear geometry to one Nd(1) and one Mn(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 Mn(1) atoms.
BaMgNd2Mn2O7 crystallizes in the orthorhombic Immm space group. Ba(1) is bonded to two equivalent Mg(1) and four equivalent O(2) atoms to form distorted BaMg2O4 octahedra that share corners with two equivalent Ba(1)Mg2O4 octahedra, corners with eight equivalent Mn(1)O6 octahedra, and edges with two equivalent Ba(1)Mg2O4 octahedra. The corner-sharing octahedral tilt angles range from 0-89°. Both Ba(1)-Mg(1) bond lengths are 2.60 Å. All Ba(1)-O(2) bond lengths are 2.99 Å. Mg(1) is bonded in a square co-planar geometry to two equivalent Ba(1), two equivalent O(1), and two equivalent O(4) atoms. Both Mg(1)-O(1) bond lengths are 1.94 Å. Both Mg(1)-O(4) bond lengths are 1.98 Å. Nd(1) is bonded in a distorted trigonal planar geometry to one O(3) and two equivalent O(2) atoms. The Nd(1)-O(3) bond length is 2.13 Å. Both Nd(1)-O(2) bond lengths are 2.39 Å. Mn(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form MnO6 octahedra that share corners with four equivalent Ba(1)Mg2O4 octahedra and corners with five equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-89°. The Mn(1)-O(3) bond length is 2.04 Å. The Mn(1)-O(4) bond length is 2.30 Å. Both Mn(1)-O(1) bond lengths are 2.01 Å. Both Mn(1)-O(2) bond lengths are 2.60 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1) and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Nd(1), and two equivalent Mn(1) atoms to form a mixture of edge and corner-sharing OBa2Nd2Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the third O site, O(3) is bonded in a linear geometry to one Nd(1) and one Mn(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 Mn(1) atoms.