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YAu is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Y is bonded in a body-centered cubic geometry to eight equivalent Au atoms. All Y–Au bond lengths are 3.13 Å. Au is bonded in a body-centered cubic geometry to eight equivalent Y atoms.
Y2Au is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded to four equivalent Au atoms to form a mixture of corner and edge-sharing YAu4 tetrahedra. There are a spread of Y–Au bond distances ranging from 2.92–3.08 Å. In the second Y site, Y is bonded in a 3-coordinate geometry to five equivalent Au atoms. There are a spread of Y–Au bond distances ranging from 2.97–3.65 Å. Au is bonded in a 9-coordinate geometry to nine Y atoms.
YAu is alpha-derived structured and crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Y is bonded in a 7-coordinate geometry to seven equivalent Au atoms. There are a spread of Y–Au bond distances ranging from 3.03–3.12 Å. Au is bonded in a 7-coordinate geometry to seven equivalent Y atoms.
Au3Y is beta Cu3Ti structured and crystallizes in the orthorhombic Pmmn space group. The structure is three-dimensional. Y3+ is bonded to twelve Au1- atoms to form a mixture of corner, edge, and face-sharing YAu12 cuboctahedra. There are a spread of Y–Au bond distances ranging from 3.03–3.11 Å. There are two inequivalent Au1- sites. In the first Au1- site, Au1- is bonded in a 12-coordinate geometry to four equivalent Y3+ atoms. In the second Au1- site, Au1- is bonded in a distorted see-saw-like geometry to four equivalent Y3+ atoms.