Reduction of hysteresis loss in LaFe(11.7)Si(1.3)H(x) hydrides with significant magnetocaloric effects
Magnetic properties and magnetocaloric effects (MCEs) have been investigated in hydrogenated LaFe11.7 Si1.3H x (x=0,1.37, and 2.07) compounds. It is found that the Curie temperature, T C, can be tuned from 192 to 338 K by adjusting the hydrogen content from 0 to 2.07. It is attractive that both thermal and magnetic hysteresis are remarkably reduced because of the weakness of the itinerant-electron metamagnetic transition after hydrogenation. The maximal hysteresis loss at T C decreases from 33.4 to 8.8 J/kg as x increases from 0 to 2.07. For the samples with x=0,1.37, and 2.07, the maximal values of the isothermal magnetic entropy change, ΔS M, are 20.9, 15.1, and 15.83 J/kg K for the increasing field and 20.76 J/kg K, 14.53 J/kg K and 15.61 J/kg K for the decreasing field at T C, with efficient refrigeration capacities of 439, 330, and 304 J/kg for a field change of 0–5 T, respectively. Large reversible MCE and small hysteresis with considerable refrigeration capacity indicate the potential of LaFe11.7Si1.3H x hydride as a candidate magnetic refrigerant around room temperature.
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