Ba3MgWO6 crystallizes in the trigonal R3m space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to three equivalent O(2) and six equivalent O(1) atoms. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. In the third Ba site, Ba(3) is bonded in a 3-coordinate geometry to three equivalent O(1) atoms. Mg(1) is bonded in a trigonal non-coplanar geometry to three equivalent O(1) atoms. W(1) is bonded in an octahedral geometry to three equivalent O(1) and three equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(3), two equivalent Ba(1), one Mg(1), and one W(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(2), and one W(1) atom.
Ba3MgWO6 crystallizes in the trigonal R3m space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to three equivalent O(2) and six equivalent O(1) atoms. All Ba(1)-O(2) bond lengths are 2.71 Å. All Ba(1)-O(1) bond lengths are 3.12 Å. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. All Ba(2)-O(1) bond lengths are 2.88 Å. All Ba(2)-O(2) bond lengths are 2.53 Å. In the third Ba site, Ba(3) is bonded in a 3-coordinate geometry to three equivalent O(1) atoms. All Ba(3)-O(1) bond lengths are 2.62 Å. Mg(1) is bonded in a trigonal non-coplanar geometry to three equivalent O(1) atoms. All Mg(1)-O(1) bond lengths are 2.04 Å. W(1) is bonded in an octahedral geometry to three equivalent O(1) and three equivalent O(2) atoms. All W(1)-O(1) bond lengths are 2.19 Å. All W(1)-O(2) bond lengths are 1.95 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(3), two equivalent Ba(1), one Mg(1), and one W(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(2), and one W(1) atom.