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Sr2ZnIn crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Sr2ZnIn ribbons oriented in the (0, 1, 0) direction. Sr is bonded in a linear geometry to one Zn and one In atom. The Sr–Zn bond length is 3.44 Å. The Sr–In bond length is 3.22 Å. Zn is bonded in a linear geometry to two equivalent Sr atoms. In is bonded in a linear geometry to two equivalent Sr atoms.
Sr2ZnIn 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 In atoms. All Sr–Zn bond lengths are 3.47 Å. All Sr–In bond lengths are 3.47 Å. Zn is bonded in a body-centered cubic geometry to eight equivalent Sr atoms. In is bonded in a body-centered cubic geometry to eight equivalent Sr atoms.