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Ru2FeGa crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Ru2FeGa ribbons oriented in the (1, 0, 0) direction. Ru is bonded in a linear geometry to one Fe and one Ga atom. The Ru–Fe bond length is 2.24 Å. The Ru–Ga bond length is 2.38 Å. Fe is bonded in a linear geometry to two equivalent Ru atoms. Ga is bonded in a linear geometry to two equivalent Ru atoms.
Ru2FeGa is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Ru is bonded in a body-centered cubic geometry to four equivalent Fe and four equivalent Ga atoms. All Ru–Fe bond lengths are 2.60 Å. All Ru–Ga bond lengths are 2.60 Å. Fe is bonded in a body-centered cubic geometry to eight equivalent Ru atoms. Ga is bonded in a body-centered cubic geometry to eight equivalent Ru atoms.