Abstract
This work investigates the MCE of alloying Pd or (Mn,Pd) to Gd, which yields the formation of an extra Gd7Pd3 or Gd7(Mn,Pd)3 phase in addition to the Gd phase, forming a composite. The phase coexistence is observed from XRD and SEM/EDX results, whereby the phase fraction of secondary phase increases with the dopant content. The magnetocaloric behavior of the binary samples present two characteristic ΔSM peaks, attributed to the Curie transitions of the coexisting biphases (separated by ΔTC = 45 K). Two minima are observed from the exponent n of field dependence of ΔSM, reinforcing the presence of the Curie transitions of the two phases. The largest phase proportion of Gd7Pd3 observed in Gd80Pd20 sample gives rise to the largest RC value, which is also 10% increase compared to single phase Gd.
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