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Y2IrAu crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Y2IrAu ribbons oriented in the (1, 0, 0) direction. Y is bonded in a linear geometry to one Ir and one Au atom. The Y–Ir bond length is 2.45 Å. The Y–Au bond length is 2.86 Å. Ir is bonded in a linear geometry to two equivalent Y atoms. Au is bonded in a linear geometry to two equivalent Y atoms.
Y2IrAu is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Y is bonded in a body-centered cubic geometry to four equivalent Ir and four equivalent Au atoms. All Y–Ir bond lengths are 3.05 Å. All Y–Au bond lengths are 3.05 Å. Ir is bonded in a body-centered cubic geometry to eight equivalent Y atoms. Au is bonded in a body-centered cubic geometry to eight equivalent Y atoms.