Y3Al2 crystallizes in the tetragonal P4_2/mnm space group. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded in a distorted square co-planar geometry to four equivalent Al(1) atoms. In the second Y site, Y(3) is bonded in a 6-coordinate geometry to six equivalent Al(1) atoms. In the third Y site, Y(2) is bonded in a 6-coordinate geometry to six equivalent Al(1) atoms. Al(1) is bonded in a 10-coordinate geometry to two equivalent Y(1), three equivalent Y(2), three equivalent Y(3), and two equivalent Al(1) atoms.
Y3Al2 crystallizes in the tetragonal P4_2/mnm space group. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded in a distorted square co-planar geometry to four equivalent Al(1) atoms. All Y(1)-Al(1) bond lengths are 3.32 Å. In the second Y site, Y(3) is bonded in a 6-coordinate geometry to six equivalent Al(1) atoms. There are four shorter (3.11 Å) and two longer (3.14 Å) Y(3)-Al(1) bond lengths. In the third Y site, Y(2) is bonded in a 6-coordinate geometry to six equivalent Al(1) atoms. There are two shorter (3.07 Å) and four longer (3.23 Å) Y(2)-Al(1) bond lengths. Al(1) is bonded in a 10-coordinate geometry to two equivalent Y(1), three equivalent Y(2), three equivalent Y(3), and two equivalent Al(1) atoms. There is one shorter (2.75 Å) and one longer (3.03 Å) Al(1)-Al(1) bond length.