In recent years, magnetic refrigeration technology has gained
importance over the issues related to maintenance and the hazardous
effect of gas compression-expansion methodologies. Magnetic
refrigeration is based on the phenomenon of magnetocaloric effect and is
characterized by isothermal magnetic entropy change and working
temperature span of the magnetic material. The simultaneous
optimization of isothermal magnetic entropy change and working
temperature span remains an open challenge. The present investigation
addresses tailoring of magnetostuctural coupling and modification of
martensite phase in Ni-Mn-Ga based alloy system. Efforts are made to
synthesize new materials and also to explore new processing routes like
melt-spinning and optimal heat treatment to expand the working
temperature span. A comparative study of magnetocaloric behaviour in
rapidly solidified ribbons and its bulk has been carried out.
Structure-property relationships in Ni-Mn-Ga based alloys have been
established. The magnetocaloric properties of rapidly quenched FeSiB and
CoSiB monolayer and bilayer ribbons will also be discussed.
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