Ba2MgWNiO6 crystallizes in the monoclinic Cm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(2), two equivalent O(4), and four equivalent O(1) atoms. In the second Ba site, Ba(2) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Mg(1) is bonded in a trigonal planar geometry to one O(3) and two equivalent O(2) atoms. W(1) is bonded in a trigonal planar geometry to one O(4) and two equivalent O(1) atoms. Ni(1) is bonded in a distorted square pyramidal geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ba(2), two equivalent Ba(1), one W(1), and one Ni(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Mg(1), and one Ni(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Ba(2), one Mg(1), and one Ni(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(2), two equivalent Ba(1), and one W(1) atom.
Ba2MgWNiO6 crystallizes in the monoclinic Cm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(2), two equivalent O(4), and four equivalent O(1) atoms. The Ba(1)-O(3) bond length is 2.60 Å. Both Ba(1)-O(2) bond lengths are 2.60 Å. Both Ba(1)-O(4) bond lengths are 3.14 Å. There are two shorter (3.20 Å) and two longer (3.39 Å) Ba(1)-O(1) bond lengths. In the second Ba site, Ba(2) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. The Ba(2)-O(4) bond length is 2.89 Å. Both Ba(2)-O(1) bond lengths are 3.05 Å. Both Ba(2)-O(2) bond lengths are 2.71 Å. Both Ba(2)-O(3) bond lengths are 3.16 Å. Mg(1) is bonded in a trigonal planar geometry to one O(3) and two equivalent O(2) atoms. The Mg(1)-O(3) bond length is 1.92 Å. Both Mg(1)-O(2) bond lengths are 1.90 Å. W(1) is bonded in a trigonal planar geometry to one O(4) and two equivalent O(1) atoms. The W(1)-O(4) bond length is 1.81 Å. Both W(1)-O(1) bond lengths are 1.83 Å. Ni(1) is bonded in a distorted square pyramidal geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. The Ni(1)-O(3) bond length is 2.03 Å. Both Ni(1)-O(1) bond lengths are 2.24 Å. Both Ni(1)-O(2) bond lengths are 1.99 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ba(2), two equivalent Ba(1), one W(1), and one Ni(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Mg(1), and one Ni(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Ba(2), one Mg(1), and one Ni(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(2), two equivalent Ba(1), and one W(1) atom.