Abstract
We investigate the influence of Sb-doping on the martensitic transformation and magnetocaloric effect in Mn50Ni40Sn Sbx (x = 1, 2, 3, and 4) alloys. All the prepared samples exhibit a B2-type structure with the space group at room temperature. The substitution of Sb increases the valence electron concentration and decreases the unit cell volume. As a result, the magnetostructural transformation shifts rapidly towards higher temperatures as x increases. The changes in magnetic entropy under different magnetic field variations are explored around this transformation. The isothermal magnetization curves exhibit typical metamagnetic behavior, indicating that the magnetostructural transformation can be induced by a magnetic field. The tunable martensitic transformation and magnetic entropy changes suggest that Mn50Ni40Sn Sbx alloys are attractive candidates for applications in solid-state refrigeration.
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