On the magnetic properties of pseudo-Laves phases RE1−yYyNi4−xAlxMg with RE = La, Ce and Gd prepared by both melting and ball milling

► LaNi4Mg did not exhibit any magnetic ordering but a paramagnetic behaviour. ► All the compounds with Gd order ferromagnetically at a temperature ranging from 77 to 15 K. ► Dilution of Gd atom by Y leads to a decrease of the Curie temperature below a critical number of Gd atoms.