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MgY2Cd crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two MgY2Cd ribbons oriented in the (0, 1, 0) direction. Mg is bonded in a linear geometry to two equivalent Y atoms. Both Mg–Y bond lengths are 3.33 Å. Y is bonded in a linear geometry to one Mg and one Cd atom. The Y–Cd bond length is 3.07 Å. Cd is bonded in a linear geometry to two equivalent Y atoms.
MgY2Cd is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight equivalent Y atoms. All Mg–Y bond lengths are 3.27 Å. Y is bonded in a body-centered cubic geometry to four equivalent Mg and four equivalent Cd atoms. All Y–Cd bond lengths are 3.27 Å. Cd is bonded in a body-centered cubic geometry to eight equivalent Y atoms.