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 Ni50Mn35-xBxIn15 (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(-1)K(-1) and 8 J kg(-1)K(-1) around magnetostructural phase transition for a magnetic field change of 5 T, respectively, for Ni50Mn34B1In15 and Ni50Mn33.5B1.5In15 samples. (C) 2020 Elsevier B.V. All rights reserved.