Mg2Dy is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Mg sites. In the first Mg site, Mg(2) is bonded to six equivalent Mg(1) and six equivalent Dy(1) atoms to form a mixture of face, edge, and corner-sharing MgDy6Mg6 cuboctahedra. In the second Mg site, Mg(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), and six equivalent Dy(1) atoms to form a mixture of face, edge, and corner-sharing MgDy6Mg6 cuboctahedra. Dy(1) is bonded in a 16-coordinate geometry to three equivalent Mg(2), nine equivalent Mg(1), and four equivalent Dy(1) atoms.
Mg2Dy is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Mg sites. In the first Mg site, Mg(2) is bonded to six equivalent Mg(1) and six equivalent Dy(1) atoms to form a mixture of face, edge, and corner-sharing MgDy6Mg6 cuboctahedra. All Mg(2)-Mg(1) bond lengths are 3.03 Å. All Mg(2)-Dy(1) bond lengths are 3.53 Å. In the second Mg site, Mg(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), and six equivalent Dy(1) atoms to form a mixture of face, edge, and corner-sharing MgDy6Mg6 cuboctahedra. There are two shorter (2.94 Å) and two longer (3.09 Å) Mg(1)-Mg(1) bond lengths. There are two shorter (3.51 Å) and four longer (3.52 Å) Mg(1)-Dy(1) bond lengths. Dy(1) is bonded in a 16-coordinate geometry to three equivalent Mg(2), nine equivalent Mg(1), and four equivalent Dy(1) atoms. There is one shorter (3.64 Å) and three longer (3.70 Å) Dy(1)-Dy(1) bond lengths.