Ba2MgMn2O6 crystallizes in the monoclinic Pm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 6-coordinate geometry to one O(3), one O(5), two equivalent O(2), and two equivalent O(6) atoms. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(6) atoms. Mg(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(5) atom. Mn(1) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(6) atom to form a mixture of distorted edge and face-sharing MnO5 trigonal bipyramids. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(2) and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ba(1), two equivalent Ba(2), and one Mg(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Mg(1), and two equivalent Mn(1) atoms. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Ba(2) and two equivalent Mn(1) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ba(1), one Mg(1), and two equivalent Mn(1) atoms. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Ba(2), and two equivalent Mn(1) atoms.
Ba2MgMn2O6 crystallizes in the monoclinic Pm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 6-coordinate geometry to one O(3), one O(5), two equivalent O(2), and two equivalent O(6) atoms. The Ba(1)-O(3) bond length is 2.83 Å. The Ba(1)-O(5) bond length is 2.80 Å. There is one shorter (2.79 Å) and one longer (3.04 Å) Ba(1)-O(2) bond length. Both Ba(1)-O(6) bond lengths are 3.30 Å. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(6) atoms. The Ba(2)-O(1) bond length is 2.68 Å. The Ba(2)-O(4) bond length is 2.81 Å. Both Ba(2)-O(2) bond lengths are 2.77 Å. There is one shorter (2.77 Å) and one longer (3.18 Å) Ba(2)-O(6) bond length. Mg(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(5) atom. The Mg(1)-O(2) bond length is 1.88 Å. The Mg(1)-O(3) bond length is 1.86 Å. The Mg(1)-O(5) bond length is 1.86 Å. Mn(1) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(6) atom to form a mixture of distorted edge and face-sharing MnO5 trigonal bipyramids. The Mn(1)-O(1) bond length is 1.94 Å. The Mn(1)-O(3) bond length is 1.96 Å. The Mn(1)-O(4) bond length is 1.93 Å. The Mn(1)-O(5) bond length is 1.96 Å. The Mn(1)-O(6) bond length is 2.29 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(2) and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ba(1), two equivalent Ba(2), and one Mg(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Mg(1), and two equivalent Mn(1) atoms. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Ba(2) and two equivalent Mn(1) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ba(1), one Mg(1), and two equivalent Mn(1) atoms. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Ba(2), and two equivalent Mn(1) atoms.