Abstract
The magnetic refrigeration (MR) utilizing magnetocaloric effect (MCE) has been recognized as an environmentally friendly and energy efficiency technology. Here we presented the magnetic properties and MCE in Pr-doped La1-xPrxFe12B6 (x=0.05-0.2) itinerant-electron metamagnetic (IEM) compounds. A small amount of Pr doping La site can greatly improve the peak values in the magnetic entropy change ΔSM(T) curves, especially under relatively low magnetic field changes (ΔH). Additionally, the peak temperature increases gradually and the magnetic hysteresis reduces gradually with increasing x. The observed MCE in present La1-xPrxFe12B6 compounds is related to its field-induced first-ordered IEM transition. The peak values of ΔSM for La1-xPrxFe12B6 compounds reach 13.4, 15.4, 12.5 and 13.0 J/(kg K) at TC ~58, 68, 72 and 89 K for x=0.05, 0.10, 0.15 and 0.2 under ΔH of 0-7 T, respectively. The corresponding relative cooling power values are 462.3, 480.7, 372.4 and 375.7 J/kg. The present La1-xPrxFe12B6 compounds could be good candidates for active MR application if the magnetic and thermal hysteresis can be further reduced. The present work indicates that the LaFe12B6-based material system could also exhibit promising magnetocaloric performances.
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