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Y2AgAl 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 Ag and four equivalent Al atoms. All Y–Ag bond lengths are 3.17 Å. All Y–Al bond lengths are 3.17 Å. Ag is bonded in a body-centered cubic geometry to eight equivalent Y atoms. Al is bonded in a body-centered cubic geometry to eight equivalent Y atoms.
Y2AgAl crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Y2AgAl ribbons oriented in the (1, 0, 0) direction. Y is bonded in a linear geometry to one Ag and one Al atom. The Y–Ag bond length is 3.01 Å. The Y–Al bond length is 2.90 Å. Ag is bonded in a linear geometry to two equivalent Y atoms. Al is bonded in a linear geometry to two equivalent Y atoms.