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Martensitic transformation, magnetic entropy, and direct adiabatic temperature changes in Ni 48 Mn 39.5 Sn 12.5− x  In  x   ( x  = 2, 4, 6) metamagnetic Heusler bulk and grain-constrained ribbon alloys were studied. All alloys showed a typical L2 1  structure in austenite and the 4O structure in martensite. Their relative volume contributions changed depending on In content. With increasing In concentration, the martensitic transformation temperature increased, whereas the Curie temperature of austenite decreased. The magnetic entropy change under magnetic field of 5 T attained maximum of 20 J/kgK in the bulk and 14.4 J/kgK in the ribbon alloys with the Ni 48 Mn 39.5 Sn 8.5 In 4  nominal composition. The corresponding adiabatic temperature change under 1.7 T yielded 1.3 K for the Ni 48 Mn 39.5 Sn 8.5 In 4  bulk alloy. Despite grain confinement, melt spinning was found to stabilize martensite phase. Changes observed were discussed with relation to strengthened covalency imposed by In substitution. Graphic abstract

journal of materials research/pratt's guide to venture capital sources

Martensitic transformation, magnetic entropy, and adiabatic temperature changes in bulk and ribbon Ni48Mn39.5Sn12.5−xInx (x = 2, 4, 6) metamagnetic shape memory alloys