Abstract
Ni 43Mn 46Sn11−xTex (x = 0.1, 0.2, 0.3, 0.4, 0.5, 1) alloys have been prepared by arc melting. Structural studies show the presence of L21 cubic austenite phase. With the increase in Te concentration, the martensite phase evolves and the lattice constant decreases. Magnetic studies show that all the alloys exhibit first-order phase transition. It has been observed that the martensite temperature increases successively with the increase in Te concentration. A non-linear variation of magnetic entropy change, thermal hysteresis was observed in the alloys with increase in Te concentration. Magnetocaloric effect has been observed over a broad range of temperature span from 215 K to 289 K by varying the Te concentration. The magnetocaloric properties with Te doping have been analysed by using quantitative approach. Successive transitions and overlapping magnetocaloric effect occur with Te doping and they can be harnessed as layered magnetocaloric materials to enhance the refrigeration capacity. Our studies manifest that the martensite temperature and magnetocaloric properties are tuneable with the Te concentration and hence can be useful for magnetic refrigeration applications.
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