Iron-Rhodium magnetocaloric alloy ribbons for high performance cooling-heating applications and process for manufacturing the same

Abstract

A polycrystalline magnetocaloric material based on thermally annealed Fe100-xRhx melt-spun ribbons with chemical composition x in the interval 48≤x≤52 at. % and the bcc CsCl-type crystal structure and method for manufacturing the same. The material has improved magnetocaloric properties associated to first-order magneto-elastic phase transition compared to bulk alloys of similar chemical composition manufactured by conventional melting techniques; exhibiting low-magnetic field induced giant magnetocaloric effects and enhanced refrigeration capacity close to the room temperature range, due to the fast increase of a magnetic entropy change at low fields followed by a broad table-like magnetic entropy change as function in the temperature curve. The material is useful as a working substance for the applications involving heating or cooling upon removal or application of an external magnetic field, including magnetocaloric refrigeration, heat exchangers, controllable delivery and release of bioactive substances imbedded in a thermo-sensitive polymer.

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