YMg3 is Uranium Silicide structured and crystallizes in the tetragonal P4/mmm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to four equivalent Mg(1), four equivalent Mg(2), and four equivalent Y(1) atoms to form distorted MgY4Mg8 cuboctahedra that share corners with twelve equivalent Mg(1)Y4Mg8 cuboctahedra, edges with eight equivalent Mg(1)Y4Mg8 cuboctahedra, edges with eight equivalent Mg(2)Y4Mg8 cuboctahedra, edges with eight equivalent Y(1)Mg12 cuboctahedra, faces with four equivalent Mg(2)Y4Mg8 cuboctahedra, faces with four equivalent Y(1)Mg12 cuboctahedra, and faces with ten equivalent Mg(1)Y4Mg8 cuboctahedra. In the second Mg site, Mg(2) is bonded to eight equivalent Mg(1) and four equivalent Y(1) atoms to form MgY4Mg8 cuboctahedra that share corners with twelve equivalent Mg(2)Y4Mg8 cuboctahedra, edges with eight equivalent Y(1)Mg12 cuboctahedra, edges with sixteen equivalent Mg(1)Y4Mg8 cuboctahedra, faces with four equivalent Y(1)Mg12 cuboctahedra, faces with six equivalent Mg(2)Y4Mg8 cuboctahedra, and faces with eight equivalent Mg(1)Y4Mg8 cuboctahedra. Y(1) is bonded to four equivalent Mg(2) and eight equivalent Mg(1) atoms to form YMg12 cuboctahedra that share corners with twelve equivalent Y(1)Mg12 cuboctahedra, edges with eight equivalent Mg(2)Y4Mg8 cuboctahedra, edges with sixteen equivalent Mg(1)Y4Mg8 cuboctahedra, faces with four equivalent Mg(2)Y4Mg8 cuboctahedra, faces with six equivalent Y(1)Mg12 cuboctahedra, and faces with eight equivalent Mg(1)Y4Mg8 cuboctahedra.
YMg3 is Uranium Silicide structured and crystallizes in the tetragonal P4/mmm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to four equivalent Mg(1), four equivalent Mg(2), and four equivalent Y(1) atoms to form distorted MgY4Mg8 cuboctahedra that share corners with twelve equivalent Mg(1)Y4Mg8 cuboctahedra, edges with eight equivalent Mg(1)Y4Mg8 cuboctahedra, edges with eight equivalent Mg(2)Y4Mg8 cuboctahedra, edges with eight equivalent Y(1)Mg12 cuboctahedra, faces with four equivalent Mg(2)Y4Mg8 cuboctahedra, faces with four equivalent Y(1)Mg12 cuboctahedra, and faces with ten equivalent Mg(1)Y4Mg8 cuboctahedra. All Mg(1)-Mg(1) bond lengths are 3.46 Å. All Mg(1)-Mg(2) bond lengths are 3.23 Å. All Mg(1)-Y(1) bond lengths are 3.23 Å. In the second Mg site, Mg(2) is bonded to eight equivalent Mg(1) and four equivalent Y(1) atoms to form MgY4Mg8 cuboctahedra that share corners with twelve equivalent Mg(2)Y4Mg8 cuboctahedra, edges with eight equivalent Y(1)Mg12 cuboctahedra, edges with sixteen equivalent Mg(1)Y4Mg8 cuboctahedra, faces with four equivalent Y(1)Mg12 cuboctahedra, faces with six equivalent Mg(2)Y4Mg8 cuboctahedra, and faces with eight equivalent Mg(1)Y4Mg8 cuboctahedra. All Mg(2)-Y(1) bond lengths are 3.46 Å. Y(1) is bonded to four equivalent Mg(2) and eight equivalent Mg(1) atoms to form YMg12 cuboctahedra that share corners with twelve equivalent Y(1)Mg12 cuboctahedra, edges with eight equivalent Mg(2)Y4Mg8 cuboctahedra, edges with sixteen equivalent Mg(1)Y4Mg8 cuboctahedra, faces with four equivalent Mg(2)Y4Mg8 cuboctahedra, faces with six equivalent Y(1)Mg12 cuboctahedra, and faces with eight equivalent Mg(1)Y4Mg8 cuboctahedra.