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La2CdIn crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two La2CdIn ribbons oriented in the (1, 0, 0) direction. La is bonded in a linear geometry to one Cd and one In atom. The La–Cd bond length is 3.14 Å. The La–In bond length is 2.98 Å. Cd is bonded in a linear geometry to two equivalent La atoms. In is bonded in a linear geometry to two equivalent La atoms.
La2CdIn is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. La is bonded in a body-centered cubic geometry to four equivalent Cd and four equivalent In atoms. All La–Cd bond lengths are 3.43 Å. All La–In bond lengths are 3.43 Å. Cd is bonded in a body-centered cubic geometry to eight equivalent La atoms. In is bonded in a body-centered cubic geometry to eight equivalent La atoms.