Abstract
A comparative investigation on magnetostructural transformation and coupled magnetocaloric properties of Ni42Mn47.5Sn10.5 and Ni41.5Mn47.5Sn10.5Zn0.5 ferromagnetic shape memory alloys prepared by arc-melting method is carried out through structural and magnetic measurements. As Zn is doped in NiMnSn alloy, the cell volume decreases and the martensitic transformation temperature increases by 21 K. Obvious metamagnetic behavior and magnetic hysteresis is observed in isothermal magnetization curves, indicating the magnetic field induced magnetostructural transformation. Magnetic field induced phase transition is also confirmed under applied field of 2 T and martensitic transformation temperature is decreased by 4.1 and 5.29 K for Ni42Mn47.5Sn10.5 and Ni41.5Mn47.5Sn10.5Zn0.5 alloys, respectively. The entropy change in Ni41.5Mn47.5Sn10.5Zn0.5 alloy with change in magnetic field from 0 to 2 T is 12.3 J · kg−1 · K−1, which is larger than that in Ni42Mn47.5Sn10.5 alloy. The achieved low field entropy change in Zn doped alloy suggests its potential application as magnetic cooling refrigerant.
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