Au3Er is beta Cu3Ti structured and crystallizes in the orthorhombic Pmmn space group. Er(1) is bonded to four equivalent Au(2) and eight equivalent Au(1) atoms to form a mixture of corner, edge, and face-sharing ErAu12 cuboctahedra. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded in a 4-coordinate geometry to four equivalent Er(1) atoms. In the second Au site, Au(2) is bonded in a distorted see-saw-like geometry to four equivalent Er(1) atoms.
Au3Er is beta Cu3Ti structured and crystallizes in the orthorhombic Pmmn space group. Er(1) is bonded to four equivalent Au(2) and eight equivalent Au(1) atoms to form a mixture of corner, edge, and face-sharing ErAu12 cuboctahedra. There are two shorter (2.97 Å) and two longer (3.06 Å) Er(1)-Au(2) bond lengths. There are a spread of Er(1)-Au(1) bond distances ranging from 2.96-3.05 Å. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded in a 4-coordinate geometry to four equivalent Er(1) atoms. In the second Au site, Au(2) is bonded in a distorted see-saw-like geometry to four equivalent Er(1) atoms.