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Sr2ZnGa crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Sr2ZnGa ribbons oriented in the (0, 1, 0) direction. Sr is bonded in a linear geometry to one Zn and one Ga atom. The Sr–Zn bond length is 3.48 Å. The Sr–Ga bond length is 3.03 Å. Zn is bonded in a linear geometry to two equivalent Sr atoms. Ga is bonded in a linear geometry to two equivalent Sr atoms.
Sr2ZnGa 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 Zn and four equivalent Ga atoms. All Sr–Zn bond lengths are 3.38 Å. All Sr–Ga bond lengths are 3.38 Å. Zn 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.