Abstract
Magnetic hysteresis loss and refrigerant capacity of the NaZn13-type La0.5Pr0.5Fe11.5−xCoxSi1.5 (0⩽x⩽1.0) compounds have been investigated. The substitution of Co in the La0.5Pr0.5Fe11.5Si1.5 causes the order of phase transition at TC to change from first order to second order at x=0.6. Although the magnetic entropy change decreases with increasing Co concentration, the hysteresis loss at TC also reduces remarkably from 94.8J∕kg for x=0to1.8J∕kg for x=0.4 because an increase in Co content can weaken the itinerant electron metamagnetic transition. The effective refrigerant capacity remains at a high value ranging from 355to433J∕kg for a field change of 0–5T as x varies from 0 to 1.0.
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