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TmAu is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Tm is bonded in a body-centered cubic geometry to eight equivalent Au atoms. All Tm–Au bond lengths are 3.08 Å. Au is bonded in a body-centered cubic geometry to eight equivalent Tm atoms.
TmAu is alpha-derived structured and crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Tm is bonded in a 7-coordinate geometry to seven equivalent Au atoms. There are a spread of Tm–Au bond distances ranging from 2.97–3.10 Å. Au is bonded in a 7-coordinate geometry to seven equivalent Tm atoms.