Title
Reduction of hysteresis loss in LaFe(11.7)Si(1.3)H(x) hydrides with significant magnetocaloric effects
Document Type
Journal Article
RIS ID
47314
Abstract
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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Publication Details
Debnath, JC, Zeng, R, Kim, J, Shamba, P & Dou, SX, (2012), Reduction of hysteresis loss in LaFe(11.7)Si(1.3)H(x) hydrides with significant magnetocaloric effects, Applied Physics A: materials science and processing, 106(1), pp. 245-250.