BaNb4MnO12 crystallizes in the orthorhombic Amm2 space group. Ba(1) is bonded in a distorted q6 geometry to two equivalent O(3), four equivalent O(1), and four equivalent O(5) atoms. Nb(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 15-43°. Mn(1) is bonded in a 4-coordinate geometry to two equivalent O(2) and two equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Ba(1) and two equivalent Nb(1) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Nb(1) and one Mn(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Ba(1) and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Nb(1) and one Mn(1) atom. In the fifth O site, O(5) is bonded in a distorted square co-planar geometry to two equivalent Ba(1) and two equivalent Nb(1) atoms.
BaNb4MnO12 crystallizes in the orthorhombic Amm2 space group. Ba(1) is bonded in a distorted q6 geometry to two equivalent O(3), four equivalent O(1), and four equivalent O(5) atoms. Both Ba(1)-O(3) bond lengths are 2.72 Å. All Ba(1)-O(1) bond lengths are 2.65 Å. There are two shorter (2.79 Å) and two longer (2.86 Å) Ba(1)-O(5) bond lengths. Nb(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 15-43°. The Nb(1)-O(2) bond length is 2.07 Å. The Nb(1)-O(3) bond length is 2.01 Å. The Nb(1)-O(4) bond length is 2.01 Å. The Nb(1)-O(5) bond length is 2.07 Å. There is one shorter (1.88 Å) and one longer (2.19 Å) Nb(1)-O(1) bond length. Mn(1) is bonded in a 4-coordinate geometry to two equivalent O(2) and two equivalent O(4) atoms. Both Mn(1)-O(2) bond lengths are 2.24 Å. Both Mn(1)-O(4) bond lengths are 2.25 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Ba(1) and two equivalent Nb(1) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Nb(1) and one Mn(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Ba(1) and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Nb(1) and one Mn(1) atom. In the fifth O site, O(5) is bonded in a distorted square co-planar geometry to two equivalent Ba(1) and two equivalent Nb(1) atoms.