Large reversible high-temperature magnetocaloric effect in Ni50−xMn38+xSb12 alloys

Accompanied by a second-order paramagnetic to ferromagnetic transition, a large reversible negative ΔSm above room temperature has been observed in Ni50−xMn38+xSb12 alloys besides low-field magnetic entropy change ΔSm around/below room temperature. A −ΔSmmax of 5.21 J kg−1 K−1 is acquired at 347 K in nominal Ni49Mn39Sb12 alloy for a magnetic-field change from 0 to 5 T, with a refrigerant capacity of 184 J kg−1. The large reversible ΔSM and the high reversible refrigerant capacity indicate that Ni49Mn39Sb12 alloy may be a promising candidate for magnetic refrigeration above room temperature.