Y5Cu5Mg8 crystallizes in the orthorhombic Pmma space group. There are five inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 4-coordinate geometry to one Cu(2), one Cu(3), and two equivalent Cu(1) atoms. In the second Mg site, Mg(2) is bonded in a distorted L-shaped geometry to two equivalent Cu(2) atoms. In the third Mg site, Mg(3) is bonded in a distorted L-shaped geometry to one Cu(2) and one Cu(3) atom. In the fourth Mg site, Mg(4) is bonded in a 4-coordinate geometry to two equivalent Cu(1) and two equivalent Cu(3) atoms. In the fifth Mg site, Mg(5) is bonded in a distorted linear geometry to two equivalent Cu(2) atoms. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded in a 5-coordinate geometry to one Cu(1), two equivalent Cu(2), and two equivalent Cu(3) atoms. In the second Y site, Y(2) is bonded in a 5-coordinate geometry to one Cu(1) and four equivalent Cu(3) atoms. In the third Y site, Y(3) is bonded in a 4-coordinate geometry to two equivalent Cu(2) and two equivalent Cu(3) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to two equivalent Mg(4), four equivalent Mg(1), one Y(2), and two equivalent Y(1) atoms. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to one Mg(1), one Mg(3), one Mg(5), two equivalent Mg(2), two equivalent Y(1), and two equivalent Y(3) atoms. In the third Cu site, Cu(3) is bonded in a 9-coordinate geometry to one Mg(1), one Mg(3), one Mg(4), two equivalent Y(1), two equivalent Y(2), and two equivalent Y(3) atoms.
Y5Cu5Mg8 crystallizes in the orthorhombic Pmma space group. There are five inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 4-coordinate geometry to one Cu(2), one Cu(3), and two equivalent Cu(1) atoms. The Mg(1)-Cu(2) bond length is 2.82 Å. The Mg(1)-Cu(3) bond length is 2.87 Å. Both Mg(1)-Cu(1) bond lengths are 2.71 Å. In the second Mg site, Mg(2) is bonded in a distorted L-shaped geometry to two equivalent Cu(2) atoms. Both Mg(2)-Cu(2) bond lengths are 2.71 Å. In the third Mg site, Mg(3) is bonded in a distorted L-shaped geometry to one Cu(2) and one Cu(3) atom. The Mg(3)-Cu(2) bond length is 2.92 Å. The Mg(3)-Cu(3) bond length is 2.93 Å. In the fourth Mg site, Mg(4) is bonded in a 4-coordinate geometry to two equivalent Cu(1) and two equivalent Cu(3) atoms. Both Mg(4)-Cu(1) bond lengths are 2.70 Å. Both Mg(4)-Cu(3) bond lengths are 2.90 Å. In the fifth Mg site, Mg(5) is bonded in a distorted linear geometry to two equivalent Cu(2) atoms. Both Mg(5)-Cu(2) bond lengths are 2.84 Å. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded in a 5-coordinate geometry to one Cu(1), two equivalent Cu(2), and two equivalent Cu(3) atoms. The Y(1)-Cu(1) bond length is 3.06 Å. Both Y(1)-Cu(2) bond lengths are 3.01 Å. Both Y(1)-Cu(3) bond lengths are 2.97 Å. In the second Y site, Y(2) is bonded in a 5-coordinate geometry to one Cu(1) and four equivalent Cu(3) atoms. The Y(2)-Cu(1) bond length is 3.09 Å. All Y(2)-Cu(3) bond lengths are 3.03 Å. In the third Y site, Y(3) is bonded in a 4-coordinate geometry to two equivalent Cu(2) and two equivalent Cu(3) atoms. Both Y(3)-Cu(2) bond lengths are 2.98 Å. Both Y(3)-Cu(3) bond lengths are 3.00 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to two equivalent Mg(4), four equivalent Mg(1), one Y(2), and two equivalent Y(1) atoms. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to one Mg(1), one Mg(3), one Mg(5), two equivalent Mg(2), two equivalent Y(1), and two equivalent Y(3) atoms. In the third Cu site, Cu(3) is bonded in a 9-coordinate geometry to one Mg(1), one Mg(3), one Mg(4), two equivalent Y(1), two equivalent Y(2), and two equivalent Y(3) atoms.