Ba2MgWNiO6 crystallizes in the orthorhombic Immm space group. Ba(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. Mg(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. W(1) is bonded in an octahedral geometry to two equivalent O(2) and four equivalent O(1) atoms. Ni(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), one Mg(1), one W(1), and one Ni(1) atom to form distorted OBa2MgNiW trigonal bipyramids that share corners with three equivalent O(1)Ba2MgNiW trigonal bipyramids, corners with six equivalent O(2)Ba4W trigonal bipyramids, edges with two equivalent O(2)Ba4W trigonal bipyramids, edges with three equivalent O(1)Ba2MgNiW trigonal bipyramids, and faces with two equivalent O(1)Ba2MgNiW trigonal bipyramids. In the second O site, O(2) is bonded to four equivalent Ba(1) and one W(1) atom to form distorted OBa4W trigonal bipyramids that share corners with five equivalent O(2)Ba4W trigonal bipyramids, corners with twelve equivalent O(1)Ba2MgNiW trigonal bipyramids, edges with four equivalent O(1)Ba2MgNiW trigonal bipyramids, and edges with four equivalent O(2)Ba4W trigonal bipyramids.
Ba2MgWNiO6 crystallizes in the orthorhombic Immm space group. Ba(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All Ba(1)-O(1) bond lengths are 2.88 Å. There are two shorter (2.82 Å) and two longer (3.21 Å) Ba(1)-O(2) bond lengths. Mg(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Mg(1)-O(1) bond lengths are 1.98 Å. W(1) is bonded in an octahedral geometry to two equivalent O(2) and four equivalent O(1) atoms. Both W(1)-O(2) bond lengths are 2.06 Å. All W(1)-O(1) bond lengths are 2.00 Å. Ni(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Ni(1)-O(1) bond lengths are 2.03 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1), one Mg(1), one W(1), and one Ni(1) atom to form distorted OBa2MgNiW trigonal bipyramids that share corners with three equivalent O(1)Ba2MgNiW trigonal bipyramids, corners with six equivalent O(2)Ba4W trigonal bipyramids, edges with two equivalent O(2)Ba4W trigonal bipyramids, edges with three equivalent O(1)Ba2MgNiW trigonal bipyramids, and faces with two equivalent O(1)Ba2MgNiW trigonal bipyramids. In the second O site, O(2) is bonded to four equivalent Ba(1) and one W(1) atom to form distorted OBa4W trigonal bipyramids that share corners with five equivalent O(2)Ba4W trigonal bipyramids, corners with twelve equivalent O(1)Ba2MgNiW trigonal bipyramids, edges with four equivalent O(1)Ba2MgNiW trigonal bipyramids, and edges with four equivalent O(2)Ba4W trigonal bipyramids.