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ErAu4 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Er is bonded to twelve equivalent Au atoms to form a mixture of edge and face-sharing ErAu12 cuboctahedra. There are eight shorter (3.01 Å) and four longer (3.03 Å) Er–Au bond lengths. Au is bonded to three equivalent Er atoms to form a mixture of distorted edge and corner-sharing AuEr3 cuboctahedra.
Er2Au is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Er sites. In the first Er site, Er is bonded to four equivalent Au atoms to form a mixture of edge and corner-sharing ErAu4 tetrahedra. There are a spread of Er–Au bond distances ranging from 2.89–3.01 Å. In the second Er site, Er is bonded in a 5-coordinate geometry to five equivalent Au atoms. There are a spread of Er–Au bond distances ranging from 2.99–3.54 Å. Au is bonded in a 9-coordinate geometry to nine Er atoms.