Abstract
For NaZn13-type LaFe11.4Al1.6−xSix (x = 0–1.6) compounds, the lattice parameter linearly reduces with the increase of Si concentration. Amixture of antiferromagnetic phase and ferromagnetic clusters has been observed in the compoundwith x = 0.22. The magnetic phase diagram obtained from the isofield magnetization curves shows that theantiferromagnetic phase changes into the ferromagnetic phase at low temperature with increasingSi concentration. A spike-shaped magnetic entropy change has been found in the sample withx = 0.3, which is a spurious result obtained by using the Maxwell relationship.Meanwhile, a very broad plateau of magnetic entropy change is obtained,which is very favorable for a magnetic refrigerant. For the sample withx = 0.8, a large magnetic entropy change and very small hysteresis losses have been found due tothe weak first-order phase transition.
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