Magnetic, transport, and magnetocaloric properties of boron doped Ni-Mn-In alloys

摘要

The impact of B substitution in Ni_(50)Mn_(35)In_(15-x)B_x Heusler alloys on the structural, magnetic, transport, and parameters of the magnetocaloric effect (MCE) has been studied by means of room-temperature X-ray diffraction and thermomagnetic measurements (in magnetic fields (H) up to 5T, and in the temperature interval 5-400 K). Direct adiabatic temperature change (△T_(AD)) measurements have been carried out for an applied magnetic field change of 1.8 T. The transition temperatures (T-x) phase diagram has been constructed for H = 0.005 T. The MCE parameters were found to be comparable to those observed in other MCE materials such as Ni_(50)Mn_(34.8)In_(14.2)B and Ni_(50)Mn_(35)In_(14)X (X=In, Al, and Ge) Heusler alloys. The maximum absolute value of △T_(AD) = 2.5K was observed at the magnetostructural transition for Ni_(50)Mn_(35)In_(14.5)B_(0.5).