Y2AlSi2 crystallizes in the orthorhombic Immm space group. Y(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Al(1) is bonded in a 4-coordinate geometry to four equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to six equivalent Y(1), two equivalent Al(1), and one Si(1) atom.
Y2AlSi2 crystallizes in the orthorhombic Immm space group. Y(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. There are four shorter (3.00 Å) and two longer (3.02 Å) Y(1)-Si(1) bond lengths. Al(1) is bonded in a 4-coordinate geometry to four equivalent Si(1) atoms. All Al(1)-Si(1) bond lengths are 2.62 Å. Si(1) is bonded in a 9-coordinate geometry to six equivalent Y(1), two equivalent Al(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.38 Å.