The study of martensitic transformation and magnetocaloric effect in rare earth Y-doped all-d-metal Ni-Co-Mn-Ti Heusler alloys

The effect of rare earth Y doping on the crystal structure, martensitic transformation and magnetocaloric effect (MCE) of Mn50-xYxNi30.5Co9.5Ti10 (x = 0, 0.3, 0.5, 0.7) ribbons have been studied in this work. The sample crystalizes coexistence of B2 and 5 M phases for x = 0, and main B2 phase with the increase of rare earth Y. At the same time, the temperature of martensitic transformation from ferromagnetic state to weak-magnetic state monotonously declines due to enriched rare earth Y-precipitated phase. The maximum magnetic entropy change (Delta Sm) and the maximum refrigerant capacity (RC) can reach 6.16(23.7) J/kgK and 82.5(216.6) J/kg under Delta H = 20(70) kOe, respectively.

Automated summary

The doping of rare earth Y was found to significantly impact the crystal structure, martensitic transformation temperature, and magnetocaloric effect of Mn-Ni-Co-Ti alloy, leading to enhanced magnetic entropy change and refrigerant capacity.