BaMgYCu2O5 crystallizes in the triclinic P1 space group. Ba(1) is bonded in a 9-coordinate geometry to one Cu(1), two equivalent O(3), two equivalent O(4), and four equivalent O(5) atoms. Mg(1) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(1), and two equivalent O(2) atoms. Y(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to one Ba(1), 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(3) and two equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1), one Y(1), and two equivalent Cu(1) atoms to form a mixture of face, corner, and edge-sharing OYMg2Cu2 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Mg(1), one Y(1), and two equivalent Cu(1) atoms to form a mixture of distorted face, corner, and edge-sharing OYMg2Cu2 trigonal bipyramids. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to two equivalent Ba(1), two equivalent Y(1), and two equivalent Cu(2) atoms. In the fourth O site, O(4) is bonded in a distorted see-saw-like geometry to two equivalent Ba(1), two equivalent Y(1), and two equivalent Cu(2) atoms. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to four equivalent Ba(1) and one Mg(1) atom.
BaMgYCu2O5 crystallizes in the triclinic P1 space group. Ba(1) is bonded in a 9-coordinate geometry to one Cu(1), two equivalent O(3), two equivalent O(4), and four equivalent O(5) atoms. The Ba(1)-Cu(1) bond length is 3.36 Å. There is one shorter (3.11 Å) and one longer (3.12 Å) Ba(1)-O(3) bond length. There is one shorter (3.10 Å) and one longer (3.12 Å) Ba(1)-O(4) bond length. There are a spread of Ba(1)-O(5) bond distances ranging from 2.75-3.05 Å. Mg(1) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(1), and two equivalent O(2) atoms. The Mg(1)-O(5) bond length is 1.95 Å. There is one shorter (2.16 Å) and one longer (2.17 Å) Mg(1)-O(1) bond length. There is one shorter (2.16 Å) and one longer (2.17 Å) Mg(1)-O(2) bond length. Y(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms. The Y(1)-O(1) bond length is 2.43 Å. The Y(1)-O(2) bond length is 2.48 Å. There is one shorter (2.28 Å) and one longer (2.30 Å) Y(1)-O(3) bond length. There is one shorter (2.28 Å) and one longer (2.30 Å) Y(1)-O(4) bond length. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to one Ba(1), two equivalent O(1), and two equivalent O(2) atoms. There is one shorter (1.97 Å) and one longer (2.01 Å) Cu(1)-O(1) bond length. There is one shorter (1.97 Å) and one longer (2.01 Å) Cu(1)-O(2) bond length. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(3) and two equivalent O(4) atoms. Both Cu(2)-O(3) bond lengths are 1.99 Å. There is one shorter (1.99 Å) and one longer (2.00 Å) Cu(2)-O(4) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1), one Y(1), and two equivalent Cu(1) atoms to form a mixture of face, corner, and edge-sharing OYMg2Cu2 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Mg(1), one Y(1), and two equivalent Cu(1) atoms to form a mixture of distorted face, corner, and edge-sharing OYMg2Cu2 trigonal bipyramids. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to two equivalent Ba(1), two equivalent Y(1), and two equivalent Cu(2) atoms. In the fourth O site, O(4) is bonded in a distorted see-saw-like geometry to two equivalent Ba(1), two equivalent Y(1), and two equivalent Cu(2) atoms. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to four equivalent Ba(1) and one Mg(1) atom.