Large magnetocaloric effect related to martensitic transformation in Ni50Co2Mn33In15 textured alloy

This paper presents the inverse magnetocaloric effect associated with martensitic transformation in a polycrystalline Ni50Co2Mn33In15 alloy. Through the structural measurements, it is found that the bulk sample have a well-developed preferred orientation. The isothermal entropy change (ΔST) has been calculated by changes of volume fractions at certain temperature based on Clausius-Clapeyron equation for different magnetic fields. The maximum ΔST of Ni50Co2Mn33In15 reaches 21.5 J/kg K and keeps in the relative broad temperature range, leading to a great refrigerant capacity under a moderate magnetic field. This can be ascribed to the fact that present textured alloy shows a large shifts in the transition equilibrium temperature with magnetic field as well as a narrow transformation width.