Abstract
The hexagonal MM’X alloys with magnetocaloric effect have been considered as potential solid-state magnetic refrigeration materials. In this work, the Mn0.5Fe0.5NiGe alloys with different heat treatments were fabricated and investigated the structural, magnetic and magnetocaloric properties. The results show all alloys crystalize the TiNiSi-type orthorhombic phase. The Curie temperature of martensite (TCM) can be tailored from 168 K to higher temperature of 240 K with the increase of annealing-quenching temperature. The maximum values of magnetic entropy change (ΔSm), refrigerant capacity (RC) and relative cooling power (RCP) reach −1.3 J/kgK, 67.1 J/kg, 80.1 J/kg with the magnetic field change of 5 T (ΔH = 5 T), respectively. The results indicate that the method of heat treatments is an efficient way to enhance the magnetic response properties in MnNiGe-based alloys.
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