Ba2GdCu2HgO7 crystallizes in the tetragonal P4/mmm space group. Ba(1) is bonded in a 9-coordinate geometry to one O(3), four equivalent O(1), and four equivalent O(2) atoms. Gd(1) is bonded in a body-centered cubic geometry to eight equivalent O(2) atoms. Cu(1) is bonded in a distorted square co-planar geometry to one O(1) and four equivalent O(2) atoms. Hg(1) is bonded in a linear geometry to two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Cu(1), and one Hg(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Gd(1), and two equivalent Cu(1) atoms. In the third O site, O(3) is bonded in a linear geometry to two equivalent Ba(1) atoms.
Ba2GdCu2HgO7 crystallizes in the tetragonal P4/mmm space group. Ba(1) is bonded in a 9-coordinate geometry to one O(3), four equivalent O(1), and four equivalent O(2) atoms. The Ba(1)-O(3) bond length is 2.62 Å. All Ba(1)-O(1) bond lengths are 2.80 Å. All Ba(1)-O(2) bond lengths are 3.08 Å. Gd(1) is bonded in a body-centered cubic geometry to eight equivalent O(2) atoms. All Gd(1)-O(2) bond lengths are 2.44 Å. Cu(1) is bonded in a distorted square co-planar geometry to one O(1) and four equivalent O(2) atoms. The Cu(1)-O(1) bond length is 2.69 Å. All Cu(1)-O(2) bond lengths are 1.96 Å. Hg(1) is bonded in a linear geometry to two equivalent O(1) atoms. Both Hg(1)-O(1) bond lengths are 2.12 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Cu(1), and one Hg(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Gd(1), and two equivalent Cu(1) atoms. In the third O site, O(3) is bonded in a linear geometry to two equivalent Ba(1) atoms.