UAl2 is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 13-coordinate geometry to one U(1), three equivalent Al(2), three equivalent Al(3), and six equivalent Al(1) atoms. In the second U site, U(2) is bonded in a 13-coordinate geometry to one U(2), three equivalent Al(1), three equivalent Al(3), and six equivalent Al(2) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent U(2), four equivalent U(1), two equivalent Al(3), and four equivalent Al(1) atoms to form a mixture of face, corner, and edge-sharing AlU6Al6 cuboctahedra. In the second Al site, Al(2) is bonded to two equivalent U(1), four equivalent U(2), two equivalent Al(3), and four equivalent Al(2) atoms to form a mixture of face, corner, and edge-sharing AlU6Al6 cuboctahedra. In the third Al site, Al(3) is bonded to three equivalent U(1), three equivalent U(2), three equivalent Al(1), and three equivalent Al(2) atoms to form a mixture of face, corner, and edge-sharing AlU6Al6 cuboctahedra.
UAl2 is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 13-coordinate geometry to one U(1), three equivalent Al(2), three equivalent Al(3), and six equivalent Al(1) atoms. The U(1)-U(1) bond length is 2.52 Å. All U(1)-Al(2) bond lengths are 3.38 Å. All U(1)-Al(3) bond lengths are 3.32 Å. All U(1)-Al(1) bond lengths are 3.06 Å. In the second U site, U(2) is bonded in a 13-coordinate geometry to one U(2), three equivalent Al(1), three equivalent Al(3), and six equivalent Al(2) atoms. The U(2)-U(2) bond length is 2.82 Å. All U(2)-Al(1) bond lengths are 3.21 Å. All U(2)-Al(3) bond lengths are 3.31 Å. All U(2)-Al(2) bond lengths are 3.13 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent U(2), four equivalent U(1), two equivalent Al(3), and four equivalent Al(1) atoms to form a mixture of face, corner, and edge-sharing AlU6Al6 cuboctahedra. Both Al(1)-Al(3) bond lengths are 2.67 Å. There are two shorter (2.65 Å) and two longer (2.93 Å) Al(1)-Al(1) bond lengths. In the second Al site, Al(2) is bonded to two equivalent U(1), four equivalent U(2), two equivalent Al(3), and four equivalent Al(2) atoms to form a mixture of face, corner, and edge-sharing AlU6Al6 cuboctahedra. Both Al(2)-Al(3) bond lengths are 2.70 Å. All Al(2)-Al(2) bond lengths are 2.79 Å. In the third Al site, Al(3) is bonded to three equivalent U(1), three equivalent U(2), three equivalent Al(1), and three equivalent Al(2) atoms to form a mixture of face, corner, and edge-sharing AlU6Al6 cuboctahedra.