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Sr2CdGa crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Sr2CdGa ribbons oriented in the (0, 1, 0) direction. Sr is bonded in a linear geometry to one Cd and one Ga atom. The Sr–Cd bond length is 3.59 Å. The Sr–Ga bond length is 3.04 Å. Cd is bonded in a linear geometry to two equivalent Sr atoms. Ga is bonded in a linear geometry to two equivalent Sr atoms.
Sr2CdGa is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Sr is bonded in a body-centered cubic geometry to four equivalent Cd and four equivalent Ga atoms. All Sr–Cd bond lengths are 3.45 Å. All Sr–Ga bond lengths are 3.45 Å. Cd is bonded in a body-centered cubic geometry to eight equivalent Sr atoms. Ga is bonded in a body-centered cubic geometry to eight equivalent Sr atoms.