Effect of the low constituent boron on martensitic transformation, magnetic, and magnetocaloric properties of Ni50Mn35In15 Heusler alloys.

We report the structural, magnetic, and magnetocaloric properties Ni 50 Mn 35− x B x In 15 (x = 1,1.5) Heusler alloys by using room-temperature X-ray diffraction (XRD), differential scanning calorimetry (DSC), and magnetization measurements. The substitution of B instead of Mn decreases the transition temperatures. Moreover, we observe a large magnetization difference between austenite and martensite phases with a thermal hysteresis around the martensitic transition. Magnetic field dependent measurements reveal that the application of a magnetic field stabilizes the austenite phase, which has higher magnetization. We calculate magnetic entropy change by two methods, namely, Maxwell relation and fraction method. We computed a maximum magnetic entropy change of 15 J kg−1K−1 and 8 J kg−1K−1 around magnetostructural phase transition for a magnetic field change of 5 T, respectively, for Ni 50 Mn 34 B 1 In 15 and Ni 50 Mn 33.5 B 1.5 In 15 samples. • Boron substitution is an effective way to tune martensitic transitions temperatures. • Both alloys have moderate ΔM and thermal hysteresis across martensitic transformation. • Transition entropy, magnetocaloric effect decreased meanwhile thermal hysteresis increased with B substitution. • Moderate magnetocaloric effect is obtained and validated by two different methods. [ABSTRACT FROM AUTHOR]