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Rh2FeIn crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Rh2FeIn ribbons oriented in the (1, 0, 0) direction. Fe is bonded in a linear geometry to two equivalent Rh atoms. Both Fe–Rh bond lengths are 2.21 Å. Rh is bonded in a linear geometry to one Fe and one In atom. The Rh–In bond length is 2.59 Å. In is bonded in a linear geometry to two equivalent Rh atoms.
Rh2FeIn is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Fe is bonded in a body-centered cubic geometry to eight equivalent Rh atoms. All Fe–Rh bond lengths are 2.72 Å. Rh is bonded in a body-centered cubic geometry to four equivalent Fe and four equivalent In atoms. All Rh–In bond lengths are 2.72 Å. In is bonded in a body-centered cubic geometry to eight equivalent Rh atoms.