BaMgYCu2O5 crystallizes in the monoclinic Cm space group. Ba(1) is bonded in a 3-coordinate geometry to three equivalent O(3) and four equivalent O(2) atoms. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Y(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted corner-sharing YO6 pentagonal pyramids. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 3-coordinate geometry to one O(3) and two equivalent O(1) atoms. In the second Cu site, Cu(2) is bonded in a 3-coordinate geometry to one O(3) and two equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), two equivalent Y(1), and one Cu(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Mg(1), one Y(1), and one Cu(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Ba(1), one Cu(1), and one Cu(2) atom.
BaMgYCu2O5 crystallizes in the monoclinic Cm space group. Ba(1) is bonded in a 3-coordinate geometry to three equivalent O(3) and four equivalent O(2) atoms. There is one shorter (2.69 Å) and two longer (3.13 Å) Ba(1)-O(3) bond lengths. There are two shorter (2.67 Å) and two longer (3.15 Å) Ba(1)-O(2) bond lengths. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Mg(1)-O(1) bond lengths are 2.11 Å. Both Mg(1)-O(2) bond lengths are 1.99 Å. Y(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted corner-sharing YO6 pentagonal pyramids. Both Y(1)-O(2) bond lengths are 2.30 Å. There are two shorter (2.27 Å) and two longer (2.40 Å) Y(1)-O(1) bond lengths. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 3-coordinate geometry to one O(3) and two equivalent O(1) atoms. The Cu(1)-O(3) bond length is 1.81 Å. Both Cu(1)-O(1) bond lengths are 1.98 Å. In the second Cu site, Cu(2) is bonded in a 3-coordinate geometry to one O(3) and two equivalent O(2) atoms. The Cu(2)-O(3) bond length is 1.84 Å. Both Cu(2)-O(2) bond lengths are 1.96 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), two equivalent Y(1), and one Cu(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Ba(1), one Mg(1), one Y(1), and one Cu(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Ba(1), one Cu(1), and one Cu(2) atom.