Abstract
The magnetic properties and magnetocaloric effects of Ni50−xMn38+xSb12 ferromagnetic shape-memory alloys with x = −1, 0, 1 and 2 that undergo a martensitic transformation were investigated. The magnetic-entropy changes ΔS of nominal Ni49Mn39Sb12, or Ni49.5Mn38.6Sb11.9, at 279 K is 6.15 J kg−1 K−1 for a magnetic-field change ΔB = 1 T, with negligible hysteresis loss, as it transforms from a low-temperature martensitic phase to a high-temperature austenitic one. The large inverse ΔS in a small field change and the negligible hysteresis loss, along with the low cost of Sb, indicate that Ni49Mn39Sb12 is a promising candidate for room-temperature magnetic refrigeration.
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