The YNi9In2-type copper-rich compounds RECu9Cd2 (RE = La, Ce, Pr, Nd) were synthesized directly from the elements in sealed niobium ampoules in an induction furnace and were characterized by powder X-ray diffraction. The structure of PrCu9Cd2 was refined from single-crystal Xray diffractometer data: P4/mbm, a = 849.0(3), c = 498.2(3) pm, wR2 = 0.0418, 374 F2 values, 23 variables. The structure ...