Martensitic transformation and magnetic properties in Mn49-xCuxNi41Sn10(x=0-2)

The crystal structure,phase transition,metamagnetic behavior and magnetic entropy change(ΔSM) of the Mn49-xCuxNi41Sn10(x=0-2) alloys were systematically studied.The results of experiment about crystal structure confirm that Mr49-xCuxNi41Sn10alloys have a highly ordered cubic L21Heusler structure.With Cu element improving,all samples have a martensitic transformation and inverse martensitic transformation by analyzing the result of magnetic measurement.The saturation magnetization of samples decreases gradually,the martensitic transformation temperature(TM) of as-annealed samples increases to a high-temperature area,and the Curie temperature(TC) of samples moves to a low-temperature area with the content of Cu element increasing from x=0 to x=2.The positive values of magnetic entropy change(ΔSM) of all alloys were investigated near the martensitic transformation.When the applied magnetic field is 3 T,a worthwhile value of ΔSMcan reach up to 32.0 J·kg-1·K-1in Mn47Cu2Ni41Sn10alloy.