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Magnetic properties and magnetic entropy change of LaFe11.5Si1.5Hy interstitial compounds

LaFe11.5Si1.5Hy interstitial compounds have been prepared by hydrogen absorption and subsequent desorption. The Curie temperatures are easily tunable for a wide temperature range from ∼ 195 to ∼ 340 K by hydrogen content. The maximal magnetic entropy changes, under a magnetic field change of 0–5 T, are as large as 16.8– 20.5 J kg−1 K−1, exceeding that of Gd (|ΔS| ∼ 9.8 J kg−1 K−1 at TC = 293 K) by 70–110% in the vicinity of room temperature. The large magnetic entropy change of all hydrides may be attributed to the first-order itinerant-electron metamagnetic transition confirmed by the Arrott plots. Large |ΔS|, convenient adjustment of TC and small thermal and magnetic hystereses, make LaFe11.5Si1.5Hy interstitial hydrides promising candidates for magnetic refrigerants in the corresponding temperature range.