Magnetocaloric effect of Co62Nb6Zr2B 30 amorphous alloys obtained by mechanical alloying or rapid quenching

摘要

Amorphous samples of nominal composition Co62Nb 6Zr2B30 have been prepared using mechanical alloying (MA) and rapid quenching (RQ) techniques. Differences appear in Curie temperature and the phases developed after crystallization. Refrigerant capacity is enhanced 20% in the MA-sample with respect to that of RQ-sample. Neglecting the demagnetizing factor of powder samples significantly affects the exponent n characterizing the field dependence of the maximum magnetic entropy change. © 2014 AIP Publishing LLC.