Abstract
Magnetic properties and magnetocaloric effects of La1−xRxFe11.5Si1.5 (R = Pr, (0 ≤ x ≤ 0.5); R = Ce and Nd, (0 ≤ x ≤ 0.3)) compounds are investigated. Partially replacing La with R = Ce, Pr and Nd in La1−xRxFe11.5Si1.5 leads to a reduction in Curie temperature due to the lattice contraction. The substitution of R for La causes an enhancement in field-induced itinerant electron metamagnetic transition, which leads to a remarkable increase in magnetic entropy change ΔSm and also in hysteresis loss. However, a high effective refrigerant capacity RCeff is still maintained in La1−xRxFe11.5Si1.5. In the present samples, a large ΔSm and a high RCeff have been achieved simultaneously.
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