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TmRh 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 Rh atoms. All Tm–Rh bond lengths are 2.93 Å. Rh is bonded in a body-centered cubic geometry to eight equivalent Tm atoms.
TmRh2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Tm is bonded in a 12-coordinate geometry to twelve equivalent Rh atoms. All Tm–Rh bond lengths are 3.12 Å. Rh is bonded to six equivalent Tm and six equivalent Rh atoms to form a mixture of face, edge, and corner-sharing RhTm6Rh6 cuboctahedra. All Rh–Rh bond lengths are 2.66 Å.