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PtAgCd2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two PtAgCd2 ribbons oriented in the (1, 0, 0) direction. Pt is bonded in a linear geometry to two equivalent Cd atoms. Both Pt–Cd bond lengths are 2.60 Å. Ag is bonded in a linear geometry to two equivalent Cd atoms. Both Ag–Cd bond lengths are 2.66 Å. Cd is bonded in a linear geometry to one Pt and one Ag atom.
PtAgCd2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Pt is bonded in a body-centered cubic geometry to eight equivalent Cd atoms. All Pt–Cd bond lengths are 2.89 Å. Ag is bonded in a distorted body-centered cubic geometry to eight equivalent Cd atoms. All Ag–Cd bond lengths are 2.89 Å. Cd is bonded in a body-centered cubic geometry to four equivalent Pt and four equivalent Ag atoms.