Mg2Ho 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 Ho(1) atoms to form a mixture of corner, edge, and face-sharing MgHo6Mg6 cuboctahedra. In the second Mg site, Mg(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), and six equivalent Ho(1) atoms to form a mixture of corner, edge, and face-sharing MgHo6Mg6 cuboctahedra. Ho(1) is bonded in a 16-coordinate geometry to three equivalent Mg(2), nine equivalent Mg(1), and four equivalent Ho(1) atoms.
Mg2Ho 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 Ho(1) atoms to form a mixture of corner, edge, and face-sharing MgHo6Mg6 cuboctahedra. All Mg(2)-Mg(1) bond lengths are 3.02 Å. All Mg(2)-Ho(1) bond lengths are 3.52 Å. In the second Mg site, Mg(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), and six equivalent Ho(1) atoms to form a mixture of corner, edge, and face-sharing MgHo6Mg6 cuboctahedra. There are two shorter (2.92 Å) and two longer (3.08 Å) Mg(1)-Mg(1) bond lengths. There are two shorter (3.50 Å) and four longer (3.51 Å) Mg(1)-Ho(1) bond lengths. Ho(1) is bonded in a 16-coordinate geometry to three equivalent Mg(2), nine equivalent Mg(1), and four equivalent Ho(1) atoms. There is one shorter (3.64 Å) and three longer (3.68 Å) Ho(1)-Ho(1) bond lengths.