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The structural, magnetic and magnetocaloric properties of Gd 7 Pd 3-   x  Fe  x   compounds with  x  = 0, 0.2 and 0.4 were investigated. Rietveld refinement of X-ray powder diffraction shows that all the investigated samples are single phase and crystallize in a hexagonal structure with the space group P6 3 mc. The lattice parameters ( a ,  b  and  c ), and the cell volume ( v ) decrease with the increase of Fe content in Gd 7 Pd 3-   x  Fe  x  , mainly because of the difference in atomic radius between Fe and Pd. Magnetization versus temperature in a magnetic applied field of 0.05 T shows that Gd 7 Pd 3-   x  Fe  x   displays a paramagnetic (PM) – ferromagnetic (FM) transition with the Curie temperature  T  C  decreasing from 336 K for  x  = 0.0 to 319 K for  x  = 0.4. Under a field change of 0 to 5 T, the maximum values of the magnetic entropy change(   |   Δ   S   M    m  a  x|   )$\left( {|{\rm{\Delta }}S_M^{max}|} \right)$    are 5.09 J kg −1  K −1 , 4.89 J kg −1  K −1 , and 4.46 J kg −1  for  x  = 0, 0.2, and 0.4, and the corresponding relative cooling powers (RCP) amount to 387.6 J Kg −1 , 357.2 J · Kg −1 , and 385.5 J Kg −1 , respectively. The stable magnetocaloric effect and refrigeration capacity near room temperature reveal that the Gd 7 Pd 3-   x  Fe  x   compounds may be considered as refrigerants for magnetic refrigeration.

Effects of Fe-doping on structural, magnetic and magnetocaloric properties of the intermetallic compound Gd 7 Pd 3- x Fe x