BaMgCu3O4 crystallizes in the orthorhombic Amm2 space group. Ba(1) is bonded in a distorted linear geometry to two equivalent Mg(1) atoms. Mg(1) is bonded in a rectangular see-saw-like geometry to two equivalent Ba(1), two equivalent O(1), and two equivalent O(2) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. In the third Cu site, Cu(3) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Cu(1), one Cu(2), and one Cu(3) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Cu(1), one Cu(2), and one Cu(3) atom.
BaMgCu3O4 crystallizes in the orthorhombic Amm2 space group. Ba(1) is bonded in a distorted linear geometry to two equivalent Mg(1) atoms. Both Ba(1)-Mg(1) bond lengths are 2.89 Å. Mg(1) is bonded in a rectangular see-saw-like geometry to two equivalent Ba(1), two equivalent O(1), and two equivalent O(2) atoms. Both Mg(1)-O(1) bond lengths are 1.95 Å. Both Mg(1)-O(2) bond lengths are 1.95 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(1)-O(1) bond lengths are 2.01 Å. Both Cu(1)-O(2) bond lengths are 2.01 Å. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(2)-O(1) bond lengths are 2.02 Å. Both Cu(2)-O(2) bond lengths are 2.03 Å. In the third Cu site, Cu(3) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(3)-O(1) bond lengths are 2.03 Å. Both Cu(3)-O(2) bond lengths are 2.03 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Cu(1), one Cu(2), and one Cu(3) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Cu(1), one Cu(2), and one Cu(3) atom.