Large reversible high-temperature magnetocaloric effect in alloys

Accompanied by a second-order paramagnetic to ferromagnetic transition, a large reversible negative Δ S m above room temperature has been observed in Ni 50 − x Mn 38 + x Sb 12 alloys besides low-field magnetic entropy change Δ S m around/below room temperature. A − Δ S m max of 5.21 J kg−1 K−1 is acquired at 347 K in nominal Ni 49 Mn 39 Sb 12 alloy for a magnetic-field change from 0 to 5 T, with a refrigerant capacity of 184 J kg−1. The large reversible Δ S M and the high reversible refrigerant capacity indicate that Ni 49 Mn 39 Sb 12 alloy may be a promising candidate for magnetic refrigeration above room temperature.