NiMn-based Heusler alloy-based solid-state refrigeration technology has received great attention in the field of magnetic refrigeration due to their low energy consumption, environmental friendliness, high magnetization difference (ΔM), low thermal hysteresis (ΔT hys ) across the magneto-structural transformation, and giant magnetocaloric properties at the low magnetic field. We report the promising rare-earth-free magnetic refrigerant material of Ni 45 Co 5 Mn 37 In 12 Si 1 prepared by arc melting followed by heattreatment with an inverse magnetocaloric effect and notable inverse ΔS M of 8.6 J kg −1 K −1 around 241 K. Moreover, the large refrigeration capacity (RC) of 462 J kg −1 with a wide operating temperature of ∼53.8 K is obtained for sample thus annealed for 10 h, which is relatively comparable with rare-earth-based high-performance Gd 5 Si 2 Ge 2 materials.
XRD patterns of the as-melted and heat-treated Ni 45 Co 5 Mn 37 In 12 Si 1 (NM) alloy; Rietveld refinement of Ni 45 Co 5 Mn 37 In 12 Si 1 + 5 at. % Gd (GA); phase fraction, lattice parameters, and goodness of fit of NM, GS, and GA from Rietveld refinement; and survey spectra and core-level XPS spectra of Ni 2p, Co 2p, Mn 2p, In 3d, and Si 2p of NM alloy (PDF)
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