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Twenty five new ternary Laves phases  RET  4 Mg and  RET  4 Cd ( RE  = rare earth element;  T  = Co, Ni, Cu, Pt) have been synthesized from the elements using niobium or tantalum tubes as inert crucible materials. The lattice parameters have been derived from powder X-ray diffraction data. The structures of Ce 1.41(1) Co 4 Mg 0.59(1) , Dy 1.10(1) Co 4 Mg 0.90(1) , LaPt 4 Cd, Y 1.10(1) Cu 4 Cd 0.90(1) , Ca 0.93(1) Cd 0.07(1) Pd 2  and Eu 0.87(2) Cd 0.13(2) Pd 2  were refined from single-crystal X-ray diffractometer data. Most phases show certain degrees of  RE /Mg or  RE /Cd disorder. The quenched phases are assigned to the MgCu 2  structure, while the annealed ones adopt the MgCu 4 Sn type, a  translationengleiche  superstructure variant of the aristotype. The annealing time has a substantial influence on the degree of ordering and is expressed in the lattice parameters, i.e. larger ones for the disordered samples. The  RE Pt 4 Cd ( RE  = La–Nd) samples have been characterized with respect to their magnetic properties. LaPt 4 Cd is a diamagnet, while CePt 4 Cd (2.23(1) µ B ), PrPt 4 Cd (3.40(1) µ B ) and NdPt 4 Cd (3.43(1) µ B ) are Curie–Weiss paramagnets. The cerium compound shows a slight moment reduction. NdPt 4 Cd is ordered ferromagnetically at  T  C  = 4.4(1) K.

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Ternary Laves phases with the MgCu 4 Sn-type structure:  RE Co 4 Mg ( RE  = Gd, Dy–Tm, Lu), EuNi 4 Mg and  RET  4 Cd ( RE  = Y, La–Nd, Sm, Gd–Dy;  T  = Cu, Pt)