Investigation of compounds for magnetocaloric applications: YFe2H4.2, YFe2D4.2, and Y0.5Tb0.5Fe2D4.2

Abstract

International audienceThe magnetocaloric properties of powder samples of the monoclinic YFe2H4.2, YFe2D4.2, and Y0.5Tb0.5Fe2D4.2 compounds have been studied at their itinerant electron metamagnetic transition (TM0 = 131, 84, and 127 K, respectively). Large reversible entropy changes are observed, up to −ΔSM = 10.83 J K−1 kg−1 for a field variation of 5 T in YFe2D4.2, making these alloys candidates for magnetic refrigeration applications. The results are compared with previously published data on other potential magnetic refrigerants with itinerant electron metamagnetic transitions

Collapse of ferromagnetism in itinerant-electron system: A magnetic, transport properties, and high pressure study of (Hf,Ta)Fe2 compounds

“…More recently, the potential of YFe 2 hydrides (deuterides) IEM systems for magnetic refrigeration application has also been revealed. 4 In addition, a large change of magnetic properties under applied pressure has been observed for YFe 2 hydrides (deuterides) and consequently a change of the magnetocaloric properties. 5,6 Here, we will focus our attention on the IEM of Fe in a selected Laves phase.…”

On the origin of the giant isotopic effect of hydrogen on the magnetic properties of YFe2A4.2 (A = H, D): A high pressure study

“…Among other hydrogen containing materials, the potential of YFe 2 hydrides (deuterides) for magnetic refrigeration application has also been recently revealed. 5 YFe 2 D 4.2 undergoes a structural transition from cubic towards monoclinic structure around room temperature. Upon cooling, a paramagnetic-antiferromagnetic (T N ¼ 131 K) occurs, and then an antiferromagnetic-ferromagnetic (F-AF) transition (T F-AF ¼ 84 K) is observed.…”

Itinerant-electron metamagnetism of the Hf1−xTaxFe2 (x=0.125 and 0.14) compounds under high pressure

“…Magnetic refrigeration based on the magnetocaloric effect has prospects in a future cooling technology, due to its high energy efficiency and low environmental impact. Recently, large reversible entropy changes have been observed in YFe 2 hydrides (deuterides) IEM systems, making these alloys candidates for magnetic refrigeration applications [4]. Moreover, a remarkably large pressure effect on the magnetic properties has been revealed for YFe 2 hydrides (deuterides) and consequently a change of the magnetocaloric properties [5,6].…”