Experimental investigation of the phase diagram of the Fe-Pd-Nd ternary system at 773 K

Abstract The isothermal section of the Fe-Pd-Nd ternary system at 773 K was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and energy dispersion spectroscopy (EDS) techniques. It is found that the isothermal section consists of 15 single-phase regions, 28 two-phase regions and 14 three-phase regions. The highest solubilities of Nd in FePd and FePd 3 , Pd in Fe 17 Nd 2 and Fe 17 Nd 5 and Fe in Pd 5 Nd, Pd 2 Nd, Pd 3 Nd 2 , Pd 4 Nd 3 and PdNd are all less than 1 at.%. Whereas the maximum solubilities of Fe in Pd 3 Nd and Pd 3 Nd 7 are approximately confirmed to be 1.0 and 4.1 at.% Fe, respectively. In the present work, a new ternary compound Nd 6 Fe 13 Pd with Pr 6 Fe 13 Ag structure, space group I 4/ mcm and lattice parameters a = 0.8076(2) and c = 2.2373(7) nm is observed.