Lu37Ru16.4In4 - coloring and vacancy formation in a new structure type closely related to a 8 x 8 x 8 bcc superstructure

The lutetium-rich intermetallic compound Lu37Ru16.4In4 was synthesized by induction melting of the elements in a sealed tantalum ampoule and subsequent annealing. The Lu37Ru16.4In4 structure was refined from single crystal X-ray diffractometer data: new type, Ia (3) over bard, a = 2756.21(11) pm, wR2 = 0.0579, 3056 F-2 values and 92 variables. The superstructure formation of Lu37Ru16.4In4 is discussed on the basis of a group-subgroup scheme starting from the bcc structure as the aristotype.