ErAlSi crystallizes in the orthorhombic Cmcm space group. Er(1) is bonded in a 9-coordinate geometry to four equivalent Al(1) and five equivalent Si(1) atoms. Al(1) is bonded in a 4-coordinate geometry to four equivalent Er(1) and four equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to five equivalent Er(1) and four equivalent Al(1) atoms.
ErAlSi crystallizes in the orthorhombic Cmcm space group. Er(1) is bonded in a 9-coordinate geometry to four equivalent Al(1) and five equivalent Si(1) atoms. All Er(1)-Al(1) bond lengths are 3.14 Å. There are a spread of Er(1)-Si(1) bond distances ranging from 2.88-3.00 Å. Al(1) is bonded in a 4-coordinate geometry to four equivalent Er(1) and four equivalent Si(1) atoms. All Al(1)-Si(1) bond lengths are 2.63 Å. Si(1) is bonded in a 9-coordinate geometry to five equivalent Er(1) and four equivalent Al(1) atoms.