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Samples of the solid solutions EuAu 4 Cd 2− x  Mg  x   were synthesized from the elements in sealed tantalum ampoules. The elements were reacted at a maximum temperature of 1273 K followed by slow cooling. For crystal growth, the polycrystalline samples were ground to powders, pressed to pellets and annealed again. All samples crystallize with the tetragonal YbAl 4 Mo 2 -type structure, space group  I 4/ mmm . The solid solution extends up to  x  = 1 and the Cd/Mg substitution has only a minor influence on the lattice parameters. The samples have been characterized by powder X-ray diffraction and the structure of EuAu 4 Cd 1.58(2) Mg 0.42(2)  was refined from single crystal X-ray diffractometer data:  a  = 715.46(14),  c  = 549.96(11) pm,  wR 2 = 0.0334, 180  F  2  values and 11 variables. The striking crystal chemical motifs of the EuAu 4 Cd 2− x  Mg  x   structures are Eu@Au 12  and (Cd/Mg)@Au 8 (Cd/Mg) 2  polyhedra and linear Cd/Mg chains in form of a tetragonal rod packing with distances of 275 pm for Cd/Mg–Cd/Mg. Temperature dependent magnetic susceptibility measurements of all samples from the solid solutions EuAu 4 Cd 2− x  Mg  x   revealed Curie–Weiss behavior and stable divalent europium. All samples are ordered ferromagnetically around  T  = 16 K, and magnetization isotherms at 3 K classify these materials as soft ferromagnets. It is remarkable that the structural Cd/Mg disorder within the chains does not influence the ferromagnetic ground state. The divalent nature of europium in these intermetallics was exemplarily studied for the EuAu 4 Cd 1.4 Mg 0.6  sample by  151 Eu Mössbauer spectroscopy. At 6 K the isomer shift is −9.95(4) mm s −1  and one observes full magnetic hyperfine field splitting with  B  hf  = 27.1(1) T.

Solid solutions EuAu 4 Cd 2− x Mg x with a remarkably stable ferromagnetic ground state